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  1. #1
    Registered Member One Ring
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    Dec 16 2008
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    Lincoln, NE

    No Heat Unless high RPMS

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    Well my heater stoped working the other day only if i have the engine reved up will it blow heat. otherwise idleing blows cold.

    2003 Audi A4 electronic climate control

    Temp Gauge stays Right at 190 and holds.

    im off to check the heater core hoses tonight but any other ideas

    THANKS

  2. #2
    Veteran Member Four Rings onceover's Avatar
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    Jun 08 2008
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    Re: No Heat Unless high RPMS

    flush the heater core while your checking the hoses

  3. #3
    Registered Member One Ring
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    Lincoln, NE

    Re: No Heat Unless high RPMS

    Quote Originally Posted by onceover View Post
    flush the heater core while your checking the hoses
    I checked the hoses tonight and the top one is cold and the bottom one is i wouldent say warm but room temp.

    also cracked the bleader for a bit and it dident help

  4. #4
    Veteran Member Four Rings Frey7190's Avatar
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    is fulla audi parts!
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    SoCal

    Re: No Heat Unless high RPMS

    my advice.. check out where your hose lines run, if your in 0* temps you might be missing those stupid Audi insulating wraps that insulate the lines... At 0* temp even hot radiator fluid will turn cold by the time the fluid gets to the heater core... The reason you get heat at high RPMS is because the fluid travels so fast through the lines it has no time to cool down...

    My fix to this problem: dont buy Audis 100+ insulation, just goto homedepot or someplace like that and wrap the lines up
    - [B] 2014 Lexus GS350 F-Sport .. Stock
    - SOLD 2012 Audi TT 2.0T DSG Quattro RNS-E, S-Tronic, Volcano Red, 35% Tint, HID Fogs
    - SOLD 2005 BMW E46 330ci 6mt, K&N intake, //M3 strut brace, SS brake lines, ccfl angel eyes, Stoptech brakes... and more!
    - SOLD 2004 Audi A4 3.0LSport, Automatic CVT, RS4 Sway, Drilled and Slotted Brakes, SS brake lines, RNS-E, E-Codes, Hi-Flo Resonator, Tint 35%, S4 spoiler, HID Fogs, APR Snuby

  5. #5
    Veteran Member Four Rings dirtybrd's Avatar
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    Mar 21 2006
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    Revo Tuned 2.0L w/35r
    Location
    Lakeland, FL.

    Re: No Heat Unless high RPMS

    Air in the heater core. The revs. help to circulate the coolant. You'll also need the check for the leak that caused the air pocket.
    BetaAlphaTauMember#6

    I'm back bitches!

    35r and REVO...what?

  6. #6
    Registered Member One Ring
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    Lincoln, NE

    Re: No Heat Unless high RPMS

    Ok well i flushed the heater Core out and it looked pretty discolored but not chunkey or really any build up. After that i filled the system back up and started the car. it was blowing pretty warm air at idle and hot air at 1700rpm and above.

    also it seems as if now my temp gauge takes a long time to reach the operating temp. ( does not ever over heat)

    If i idle for a bit the gauge holds right in the middle then if i rev it up and hold it for a cupple of seconds i can see the temp gauge go down pretty quick.

    Sorry for the long post guys it seems like an air pocket or a bad thermostat but i am stumped right now

  7. #7
    Veteran Member Four Rings dirtybrd's Avatar
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    Mar 21 2006
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    Revo Tuned 2.0L w/35r
    Location
    Lakeland, FL.

    Re: No Heat Unless high RPMS

    You have a bad thermostat. It's stuck in the open position and not allowing the eng. to get to proper temp. This will cause it to use more fuel also.
    BetaAlphaTauMember#6

    I'm back bitches!

    35r and REVO...what?

  8. #8
    Account Terminated Four Rings
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    Sep 15 2006
    AZ Member #
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    My Garage
    2001 S4 GT28, 2001 S4 168K
    Location
    Long Island, NY

    Re: No Heat Unless high RPMS

    your waterpump is starting to go bad and replace your thermostat also

    Had this happen on a S4 also

  9. #9
    Veteran Member Four Rings dirtybrd's Avatar
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    Revo Tuned 2.0L w/35r
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    Re: No Heat Unless high RPMS

    But he not running hot, just no heat. Lack of circulation would cause a overheat condition.
    BetaAlphaTauMember#6

    I'm back bitches!

    35r and REVO...what?

  10. #10
    Veteran Member Four Rings JMRQuattro's Avatar
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    Seattle, Washington

    Re: No Heat Unless high RPMS

    i'm still having this problem too. Little to no heat during regular driving around town but if i drive on the freeway at about 70 mph , 3000 rpm's, the heat eventually comes on and gets hot. And today doing snow drifting the heat was really hot as well. Same issue with the temp guage taking a long time to heat up as well.
    - Justin -

  11. #11
    Senior Member Three Rings Fiyacracka's Avatar
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    Feb 13 2008
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    Location
    Toronto

    Re: No Heat Unless high RPMS

    I have a similar problem as well on my 2000 s4. I already replaced the waterpump, thermostat and radiator. All this happened after I did my timing belt. I had my mechanic redo the thermostat and waterpump.. still no luck

  12. #12
    Senior Member Two Rings Samir4486's Avatar
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    Jul 02 2008
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    04 A4 1.8TQ 6MT
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    ATX

    Re: No Heat Unless high RPMS

    i noticed the same problem the last couple of weeks with my car also, i was on the highway and the heat was working just fine, once i got off and was driving at low speeds the air was colder, anyone figured it out yet?

  13. #13
    Senior Member Three Rings 03AudiA41.8T's Avatar
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    Nov 08 2008
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    zx7r
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    Pittsburgh,PA

    Re: No Heat Unless high RPMS

    It has got to be air locked or the thermostat needs replaced.

  14. #14
    Senior Member Three Rings Fiyacracka's Avatar
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    Toronto

    Re: No Heat Unless high RPMS

    It is not the thermostat because my temperature gauge will not go lower than 90 degrees celsius. I know of 3 Audis that have the same problem. Even the dealer misdiagnosed the car. They put a heater core in my friends car and he ended up with the same problem. Any other ideas? The car has been airlifted as well

  15. #15
    In Limbo One Ring
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    Location
    NJ

    Re: No Heat Unless high RPMS

    my bros 2002 a4 same problem the car just stand now to cold to even get in it n try to drive it he gone flush the whole coolant n go from there! keep posting if u igure the problem

  16. #16
    Senior Member Three Rings 04_A4_1.8T's Avatar
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    Apr 13 2008
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    04 Audi A4 1.8T
    Location
    Utah

    Re: No Heat Unless high RPMS

    my car is taking for ever to heat up after i turn it on... normally it took maybe 2 blocks... not it take more then double that.. could i solve that by flushing the heater core as well? or what could be causing this??
    My Cars...
    1998 Honda Civic Ex... *sold*
    2004 Audi A4 1.8T Giac Stage 1+ *current*
    *Honda Cbr 600rr* Springtime

  17. #17
    Veteran Member Three Rings festerfm's Avatar
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    Feb 07 2008
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    just the a4
    Location
    northeast pa

    Re: No Heat Unless high RPMS

    Quote Originally Posted by dirtybrd View Post
    You have a bad thermostat. It's stuck in the open position and not allowing the eng. to get to proper temp. This will cause it to use more fuel also.
    i think i'm going to check this out.. my car seems to take forever to heat up but when i slow down or just cruise, the car temp cools down also.. it's frustrating.. and we wont even get into gas mileage... i just tried autozone.com to find a thermostat for my car... nothing... they have 2 dif coolant temp sensors but no thermostat.. a 4wire green top sensor for $7 and a 2 wire black for $35...

  18. #18
    Veteran Member Three Rings Trev's Avatar
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    Nov 25 2007
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    b6 a4tq, 95 Eagle Talon (Rip)
    Location
    British Columbia, Canada

    Re: No Heat Unless high RPMS

    I'm in the same boat. Exact same symptoms.

    Iv done heater flush, coolant flush, new water pump and constantly bleed the system. Still no luck.

    I don't have the heater wrap around my hoses tho.... Temps in my area have been around the 0*C range.

    Could the heat wrap really make that much of a difference?
    Last edited by Trev; 09-28-2009 at 11:25 AM.
    Some Go, No show
    02 Qtip, Apr II+ 93Oct, tt-225 injectors, Ecode fmic, W/M Injection, Magnaflow 16601,TT225 Down Pipe, VMR test pipe, APR TIP, Forge 007, Vag-Com, Podi V2, RS4 LSB, ECS Snub, USP front lower, S4 Front Brakes, Slotted/Dimpled Rotors f/r, SS Lines f/r, 19x8.5 & 19x9.5 RPM 505's, RNS-E

    Wish List
    Custom fab intake heat shield, Custom fab system in trunk, Adjustable Coilovers, S4 blades, DTH side skirts

  19. #19
    Established Member Two Rings
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    Aug 18 2005
    AZ Member #
    7635
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    2002 A4 1.8T
    Location
    Virginia

    Re: No Heat Unless high RPMS

    Add me to the list of having this problem.

    Does anyone else have their coolant display in center come on and flash randomly with no kind of predictability or pattern?

    Hopefully someone will figure out an answer
    Last edited by jhmarsh28; 01-21-2009 at 05:28 PM.

  20. #20
    Senior Member Two Rings lt1camaro350's Avatar
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    Re: No Heat Unless high RPMS

    i have the same problem im changing water pump belts and thermostat + thermostat housing.

  21. #21
    Established Member Two Rings
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    Aug 18 2005
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    2002 A4 1.8T
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    Virginia

    Re: No Heat Unless high RPMS

    Let us know if that solves the problem

  22. #22
    Registered Member Two Rings wiscaudi's Avatar
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    Aug 03 2007
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    Milwaukee, Wisconsin

    Re: No Heat Unless high RPMS

    Quote Originally Posted by jhmarsh28 View Post
    Add me to the list of having this problem.

    Does anyone else have their coolant display in center come on and flash randomly with no kind of predictability or pattern?

    Hopefully someone will figure out an answer
    Same issue. Coolant display sometimes comes on when I first start the car after sitting outside all night (near 0 degree F temps). After the car is running for a bit the symbol goes away. High RPM's = Heat Normal RPM's = No Heat.

    I'd like to check my coolant level but my hood release handle broke about a month ago and now I believe the cable became detached under the hood. Time to buy a big ass screwdriver or bust the grill out.... Fantastic!
    2003 B6 A4 1.8T Quattro 5 Speed

  23. #23
    Veteran Member Three Rings passatkid's Avatar
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    Sep 19 2006
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    ND

    Re: No Heat Unless high RPMS

    Same issue, but only when its really cold, when it is in the 20's have heat all the time, only when it gets around zero do I have issues, and considering its been around -10 for the last couple weekes here, it sucks, freeway driving yields warm heat.

  24. #24
    Veteran Member Four Rings JMRQuattro's Avatar
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    Seattle, Washington

    Re: No Heat Unless high RPMS

    Quote Originally Posted by wiscaudi View Post
    Same issue. Coolant display sometimes comes on when I first start the car after sitting outside all night (near 0 degree F temps). After the car is running for a bit the symbol goes away. High RPM's = Heat Normal RPM's = No Heat.

    I'd like to check my coolant level but my hood release handle broke about a month ago and now I believe the cable became detached under the hood. Time to buy a big ass screwdriver or bust the grill out.... Fantastic!
    same issue. It's really pissing me off. The car is always cold unless i'm on the damn freeway. The coolant display comes on when i start the car sometimes and then goes away when the car warms up. And the same goes for high and low rpm's. It's still happening and it's been months.

    There seems to be a lot of people with this problem. Maybe we should start a new class action lawsuit.
    - Justin -

  25. #25
    Veteran Member Three Rings Trev's Avatar
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    Nov 25 2007
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    My Garage
    b6 a4tq, 95 Eagle Talon (Rip)
    Location
    British Columbia, Canada

    Re: No Heat Unless high RPMS

    I decided to do a full VAG scan of my car and found two things that might be related:

    Address 08: Auto HVAC
    01274 - Air flow positioning motor (v71)
    41-10 - Blocked or no voltage - Intermittent


    Address 46: Central Conv.
    01320 - Control module for climatronic (j255)
    49-10 - No communications - Intermittent


    Can some one who is also having heating problems do a full scan to see if maybe one of these are are the culprit?
    Oh and none of these codes through a CEL.
    Some Go, No show
    02 Qtip, Apr II+ 93Oct, tt-225 injectors, Ecode fmic, W/M Injection, Magnaflow 16601,TT225 Down Pipe, VMR test pipe, APR TIP, Forge 007, Vag-Com, Podi V2, RS4 LSB, ECS Snub, USP front lower, S4 Front Brakes, Slotted/Dimpled Rotors f/r, SS Lines f/r, 19x8.5 & 19x9.5 RPM 505's, RNS-E

    Wish List
    Custom fab intake heat shield, Custom fab system in trunk, Adjustable Coilovers, S4 blades, DTH side skirts

  26. #26
    Registered Member Two Rings wiscaudi's Avatar
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    Aug 03 2007
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    Milwaukee, Wisconsin

    Re: No Heat Unless high RPMS

    Got under the car and got the hood popped.

    The belly pan had a nice amount of coolant on it. Forward, driver's side of the pan, under the radiator hoses and water pump. I didn't have enough time to investigate exactly where the leak is coming from (suspect the water pump), but topping off the fluid helped. I was just below the Minimum line before topping off. Heat and everything is working fine at this point.

    We'll see how long the leak stays at this rate. For now, keeping a 50/50 mix of Audi G12 and water in the trunk will have to suffice.
    2003 B6 A4 1.8T Quattro 5 Speed

  27. #27
    Established Member Two Rings Altec-Racing's Avatar
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    Aug 31 2007
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    04 USP blk/blk
    Location
    Seattle

    Re: No Heat Unless high RPMS

    It seems like there are two different issues going on here

    1. low/no heat at idle and city driving.
    2. Water temp drop while under load.

    I'm experiencing low heat at idle, only when its real cold out. My car gets to operating temp after about 5 minutes of city driving. I also get the coolant light flash on cold mornings, and the cold start idle is really rough.

  28. #28
    Registered Member One Ring
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    Feb 03 2009
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    '04 A4 1.8T Quattro
    Location
    Winnipeg, MB

    Re: No Heat Unless high RPMS

    Quote Originally Posted by Altec-Racing View Post
    It seems like there are two different issues going on here
    1. low/no heat at idle and city driving.
    2. Water temp drop while under load.
    Definitely two things going on. I've got problem #1.

    Had the thermostat changed first, no dice, and then I noticed I was losing coolant. Searched around and found an Audi Technical Service Bulletin, tag line "coolant leak or no heat", blames it on a plastic plug in the cylinder block, near thermostat housing, that is faulty under 0'C (about -25'C here lately). Had that checked out, found some leakage so it was changed last week. Up to now seems leaking has stopped but heat gone again after a couple days. Could it be air leak or plugged up heater core?

  29. #29
    Established Member Two Rings deaner1979's Avatar
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    May 15 2007
    AZ Member #
    18047
    My Garage
    '03 A4 1.8TQ & a 16v Motor
    Location
    Ontario, CANADA

    Re: No Heat Unless high RPMS

    I have had the same prob too and just had sensor and rear flange fixed for leak... everything changed, (thermostat, waterpump...ect...) heater core flushed..... no heat at idle, only heat at hwy speeds. Going to Audi tomorrow night to chew thier heads off and find a resolution. My delaer has 1st place mechanic there from this years audi tech challange in Atlanta...
    see what he says and I will get back to you !!
    _______________________________________
    A.K.A. Jettcoupe1979

    *ESP: enable smoke production
    "16V owners usually think they have god's balls under the hood."..... Thats because I Do !!!

  30. #30
    Registered Member Two Rings ImAudi's Avatar
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    Jun 05 2007
    AZ Member #
    18588
    My Garage
    2001.5 Audi S4
    Location
    Holland, Michigan

    Re: No Heat Unless high RPMS

    Im having this same problem too(#1)
    Just changed the timing belt, water pump, coolant flange and valve cover gasket.
    Now i have no heat unless under RPM's.
    Lets find why!

  31. #31
    Registered Member Two Rings wiscaudi's Avatar
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    Aug 03 2007
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    Location
    Milwaukee, Wisconsin

    Re: No Heat Unless high RPMS

    Quote Originally Posted by ImAudi View Post
    Im having this same problem too(#1)
    Just changed the timing belt, water pump, coolant flange and valve cover gasket.
    Now i have no heat unless under RPM's.
    Lets find why!
    Were you having issues with your heat prior to the TB job?
    2003 B6 A4 1.8T Quattro 5 Speed

  32. #32
    Veteran Member Four Rings pOrKcHoP07's Avatar
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    Oct 13 2007
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    21778
    My Garage
    '85 E30 318i
    Location
    Yonkers, NY

    Re: No Heat Unless high RPMS

    I dunno if its the cold temperature outside (-9) or my car. I warm it up for 15 min, the temperature gauge says its fully warmed up, but all it does is blow cold air out. I make a 10 min commute, so I don't really get to see if it warms up after...could it just be cold outside and takes more time to warm up?
    2003 Audi A4 1.8T Quattro
    AKA: masterforu2nv

    Current Mods:
    Debadge. 3000k DDM Tuning HID Fogs. 5000k DDM Tuning HID Kit. AWE Exhaust. Window/Fog Vag Mod. VMAXX Coilovers. Enkei Raijins. Adam Rotors. Hawk HPS Pads. SS Brake Lines. RAI Testpipe. Racetec FMIC. JHM SS. Motoza Stage 1 Chip.Evolution Racewerks TIP.

  33. #33
    Established Member Two Rings deaner1979's Avatar
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    May 15 2007
    AZ Member #
    18047
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    '03 A4 1.8TQ & a 16v Motor
    Location
    Ontario, CANADA

    Re: No Heat Unless high RPMS

    OK......... I was just at the dealer and had a long conversation about this... the 3 mechanics advised the car has a little bit of a design flaw.
    My car '03 has had everything done (temp sensor, thermostat, waterpump ect...) I have the same problem as all of you. He said for cold temps like everyone is having it is normal for the car to be cold and at idle to run cold. He said leaving at idle in the morning wont even warm it up after like 45 mins. the car needs at least 2500 constant RPM to make things work. He said this is all too common with these generation vehicles. I asked what about flushing the heater core, they advised waste of time unless there is a serious problem. I also asked about the electronic thermostat throwing codes, he said it can throw all kinds if its an issue, but there is no way of really pointing on that unless replaced, and 95% of the time it isnt even that.

    Hope this helps.... cause Im sick of freezing my A$$ of in the morning !!!
    _______________________________________
    A.K.A. Jettcoupe1979

    *ESP: enable smoke production
    "16V owners usually think they have god's balls under the hood."..... Thats because I Do !!!

  34. #34
    Veteran Member Four Rings pOrKcHoP07's Avatar
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    Oct 13 2007
    AZ Member #
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    My Garage
    '85 E30 318i
    Location
    Yonkers, NY

    Re: No Heat Unless high RPMS

    ^ you the man. Thanks for clearing it up. Makes sense, cuz in the morning when the rpm's jump it gets noticeably warmer, but at idle its nice n cold!
    2003 Audi A4 1.8T Quattro
    AKA: masterforu2nv

    Current Mods:
    Debadge. 3000k DDM Tuning HID Fogs. 5000k DDM Tuning HID Kit. AWE Exhaust. Window/Fog Vag Mod. VMAXX Coilovers. Enkei Raijins. Adam Rotors. Hawk HPS Pads. SS Brake Lines. RAI Testpipe. Racetec FMIC. JHM SS. Motoza Stage 1 Chip.Evolution Racewerks TIP.

  35. #35
    Veteran Member Three Rings woofster's Avatar
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    Jun 10 2007
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    18699
    Location
    Toronto, Ontario, Canada

    Re: No Heat Unless high RPMS

    Wierd gremlins with these B6s. I had a very gradual decline to no heat at all a few months ago. Had my heater core flushed in late December and everything was running perfect: warm air blowing strongly into the cabin.

    Fast-forward to this month, where we're getting pretty cold temperatures again and I'm noticing that it's, once again, taking a long time to heat the cabin. Last time I drove about 45 minutes and the air was only somewhat warm. Since the heater core has been recently flushed, I can't figure out what else the problem might be.
    2003 Acura MDX
    2006 BMW X3

  36. #36
    Registered Member Two Rings ImAudi's Avatar
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    Jun 05 2007
    AZ Member #
    18588
    My Garage
    2001.5 Audi S4
    Location
    Holland, Michigan

    Re: No Heat Unless high RPMS

    I had no problems before my timing belt was changed.
    Im sick of my B6, who wants to buy it? haha

  37. #37
    Veteran Member Three Rings woofster's Avatar
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    Jun 10 2007
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    Toronto, Ontario, Canada

    Re: No Heat Unless high RPMS

    Ok, I just discovered something very strange. I typically have my HVAC settings at 21-24 deg C and AUTO air distribution with the automatic recirc on. I experimented with the manual settings and turned the AUTO off and manually selected the MIDDLE and LOWER air vent arrangement.

    Right away, I heard the HVAC system flaps/valves move and re-direct air to the proper vents. Soon enough, warm air was rushing out from the vents on the dashboard as well as the floor grilles. The second I turned manual off and AUTO back on, the middle and floor vents closed off and the system began blowing cooler air back towards the windshield. It almost seems like the AUTO mode is forcing the HVAC system to blow an incorrect air temperature mix up towards the windshield...
    2003 Acura MDX
    2006 BMW X3

  38. #38
    Registered Member Two Rings ImAudi's Avatar
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    Jun 05 2007
    AZ Member #
    18588
    My Garage
    2001.5 Audi S4
    Location
    Holland, Michigan

    Re: No Heat Unless high RPMS

    Quote Originally Posted by woofster View Post
    Ok, I just discovered something very strange. I typically have my HVAC settings at 21-24 deg C and AUTO air distribution with the automatic recirc on. I experimented with the manual settings and turned the AUTO off and manually selected the MIDDLE and LOWER air vent arrangement.

    Right away, I heard the HVAC system flaps/valves move and re-direct air to the proper vents. Soon enough, warm air was rushing out from the vents on the dashboard as well as the floor grilles. The second I turned manual off and AUTO back on, the middle and floor vents closed off and the system began blowing cooler air back towards the windshield. It almost seems like the AUTO mode is forcing the HVAC system to blow an incorrect air temperature mix up towards the windshield...

    Im going to check this out in a minute

  39. #39
    Veteran Member Four Rings mister_tu's Avatar
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    Sep 27 2007
    AZ Member #
    21380
    My Garage
    2004 Audi A4 & 1991 Toyota MR2
    Location
    Worcester, MA

    Re: No Heat Unless high RPMS

    I've been having the same problem and was just outside and tried every setting and still cold air and it's only 40 degrees outside.

    I have been having this problem for the past couple of months.

    2 months ago: I was getting the coolant light on the dash, topped off the coolant and it blew hot air at idle...maybe this was a coincedence? I thought it was an air pocket in the coolant system and tried to "burp" the system and still no luck. I put in about 2 quarts of G12 50/50, light went off and still having problem.

    Today: I was getting coolant light, tried to "burp" the system again and added another 2 quarts and still blowing cold air. I ran rpms to 2500 for about 10 seconds and warms up right away, but the moment I let off the gas, cold air again.

    I can't stand this cold weather and need heat!! HELP!!

  40. #40
    Veteran Member Four Rings mister_tu's Avatar
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    Sep 27 2007
    AZ Member #
    21380
    My Garage
    2004 Audi A4 & 1991 Toyota MR2
    Location
    Worcester, MA

    Re: No Heat Unless high RPMS

    This seems that all this is happening after we have our timing belt replaced. Mine was replaced back in September. This is the pattern I am seeing, can everyone else confirm?

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