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  1. #1
    Established Member Two Rings
    Join Date
    Jan 04 2009
    AZ Member #
    37046
    My Garage
    2004 A4
    Location
    Las Vegas

    Temp gauge goes down when heater turns on

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    Everytime I turn my heater on my tempature gauge goes 1/4 lower on the guage. Also my car takes long to heat up. I have no leaks and I my coolant level is good. Is this my thermostat?

  2. #2
    Veteran Member Four Rings MmmBoost's Avatar
    Join Date
    Nov 29 2005
    AZ Member #
    9007
    My Garage
    10 A4 Avant S-line, 07 Suzuki GSX-R600, '69 VW Beetle w/ 1.9L aircooled turbo
    Location
    Edmonton, AB

    sounds like your thermostat

    I had debris in my engine block coolant passages that kept getting into my thermostat and not allowing the valve to full close which allowed coolant to the radiator. My car would take forever to warm up and sometimes just wouldn't. I changed the thermostat and it didn't solve the issue. I finally found out what the culprit was when i inspected my old t-stat as well as when I tore down the block to do my engine build.
    ~Chris

    Podi.ca Team
    My B6 Avant GT2871R build
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    "Robert Bosch don't fuck around"

  3. #3
    Veteran Member Three Rings A4Maine-iac's Avatar
    Join Date
    May 03 2010
    AZ Member #
    58482
    My Garage
    2011 VW Routan , Silver 08- A4 Kids Size - Kaylah Sticker Mod
    Location
    Maine
    Items for Sale

    ^x 2 on thermostat. Had same issue with mine.Took about an hour and all was good!
    2002 A4 1.8T - sold


    2007 DTM S4

  4. #4
    Veteran Member Four Rings s6sputnik's Avatar
    Join Date
    Sep 15 2006
    AZ Member #
    11357
    My Garage
    95 S6 rs2//13 A6 3.0T//04 S4
    Location
    Austin Texas

    Quote Originally Posted by krisko View Post
    Everytime I turn my heater on my tempature gauge goes 1/4 lower on the guage. Also my car takes long to heat up. I have no leaks and I my coolant level is good. Is this my thermostat?
    It is probably your thermostat, but do keep in mind that it is the coolant that is used in your heater so things change once you turn it on! I would check your coolant level and keep your eye on the gauges for a few days!
    Shawn
    // 95 S6 RS2 // 13 A6 3.0T // 04 S4

  5. #5
    Active Member Two Rings rawkey's Avatar
    Join Date
    Mar 26 2006
    AZ Member #
    11044
    Location
    Ottawa

    $130 for thermostat at the dealer
    get some G12
    replace the Jplug part# 06B-103-033-A since you're in there
    http://www.audizine.com/forum/showth...at+replacement

  6. #6
    Veteran Member Four Rings onceover's Avatar
    Join Date
    Jun 08 2008
    AZ Member #
    29690
    My Garage
    B6 A4, 964 Carrera, 955 Cayenne S, MK1 Cabrio, T2b Westfalia
    Location
    Calgary AB Canada
    Items for Sale

    I had the same problem last year and replaced the tstat ant everything was great. This year its not as bad but still cools off a bit while idling with the heat on.

    Could a faulty coolant temp sensor be affecting how the tstat opens and closes?
    Last edited by onceover; 11-25-2010 at 08:32 PM.

    2004 Audi A4 1.8T // quattro // 6 Speed // Brilliant Red
    Built 1.8T || AEB || Motoza tuned || GT3076R

    1989 Porsche Carrera 4 // 5 Speed // Guards Red

    BetaAlphaTau Member #111

  7. #7
    Veteran Member Four Rings alexza4's Avatar
    Join Date
    Apr 23 2007
    AZ Member #
    17513
    My Garage
    13-X5||01-///M3
    Location
    Maryland
    Items for Sale

    yes, def. thermostat
    2003 A4 QM EFR 6758 on meth - SOLD :((
    2015 S5 Daytona Grey - ON ORDER :))

  8. #8
    Active Member Two Rings rawkey's Avatar
    Join Date
    Mar 26 2006
    AZ Member #
    11044
    Location
    Ottawa

    Quote Originally Posted by onceover View Post
    I had the same problem last year and replaced the tstat ant everything was great. This year its not as bad but still cools off a bit while idling with the heat on.

    Could a faulty coolant temp sensor be affecting how the tstat opens and closes?
    From my understanding the CTS on the coolant flange sends signal to ecu for temperature monitoring and CTS on rad contols fans.

  9. #9
    Established Member Two Rings
    Join Date
    Jan 04 2009
    AZ Member #
    37046
    My Garage
    2004 A4
    Location
    Las Vegas

    Update.* Im about to change my t-stat but now when I first turn my car on my radiator fans both turn on for about a 10 minutes then will shut off when the car starts to warm up? Whats causing this issue is the temp sensor hooked into the thermostat?



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