Radiator fan staying on after car is off

[sage0607]

Hey, my radiator fans are on full blast after shutting my car off for about a minute or even just opening the door they turn on. My car does not overheat and fans work normal when the car is actually on. Any ideas of the problem?

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[SwankPeRFection]

That’s the sign of a bad/failing thermostat. Your gauge may not be going over normal temp, but it’ll start to. Get it resolved ASAP. FYI, there’s a good chance if you take it to a dealership or other mechanic, they will misdiagnose this without a pic of the temp gauge showing an overhear condition. Fair warning on that… I’ve had it happen to a friend with another Audi and it took 3 trip to the dealership to get the problem finally fixed right. Each time the mechanic looking at the issue misdiagnosed it. The all behave like this when they’re running hot from a failing thermostat on shut off. Mine did the same when mine when the first time.

[SwankPeRFection]

Only other wackiness that could cause this is if you’ve got an 034 ECU flash and you’ve turned on the fans at full blast as part of their staging lanes routine. If you don’t have that, then it’s your thermostat.

[sage0607]

That’s the sign of a bad/failing thermostat. Your gauge may not be going over normal temp, but it’ll start to. Get it resolved ASAP. FYI, there’s a good chance if you take it to a dealership or other mechanic, they will misdiagnose this without a pic of the temp gauge showing an overhear condition. Fair warning on that… I’ve had it happen to a friend with another Audi and it took 3 trip to the dealership to get the problem finally fixed right. Each time the mechanic looking at the issue misdiagnosed it. The all behave like this when they’re running hot from a failing thermostat on shut off. Mine did the same when mine when the first time.

Okay I appreciate it, I will get that replaced asap and check back in

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[sage0607]

Only other wackiness that could cause this is if you’ve got an 034 ECU flash and you’ve turned on the fans at full blast as part of their staging lanes routine. If you don’t have that, then it’s your thermostat.

I planned to replace t stat anyways as I'm near 100k now but I do not believe this to be the issue as it does this even when I simply unlock my door with completely cold car. I have ie stage 2+ dual pulley throttle file for what its worth and no I made sure I had the fan speed thing off

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[RoofRails]

I planned to replace t stat anyways as I'm near 100k now but I do not believe this to be the issue as it does this even when I simply unlock my door with completely cold car. I have ie stage 2+ dual pulley throttle file for what its worth and no I made sure I had the fan speed thing off

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Is your HX Coolant pump depinned ? There was some weird things that would happen with the I.E fans on mod and a depinned HX pump.

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[sage0607]

Is your HX Coolant pump depinned ? There was some weird things that would happen with the I.E fans on mod and a depinned HX pump.

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I have the mercracing cwa100 with the easy harness so it shouldn't be de pinned as far as I know

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[RoofRails]

I have the mercracing cwa100 with the easy harness so it shouldn't be de pinned as far as I know

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Even if it isn't depinned and is working with the control signal wire , they can throw a soft code as if the ECU can not see it. It's that soft code that the I.E fans on feature does not like. Now, if you have had this same setup (hardware and software) working well together for a while and this just started, then I'm probably barking up the wrong tree. Even so, it's worth scanning the ecu to see if there's a code for the HX pump.

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[sage0607]

Even if it isn't depinned and is working with the control signal wire , they can throw a soft code as if the ECU can not see it. It's that soft code that the I.E fans on feature does not like. Now, if you have had this same setup (hardware and software) working well together for a while and this just started, then I'm probably barking up the wrong tree. Even so, it's worth scanning the ecu to see if there's a code for the HX pump.

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Okay let me check for codes here and also see if I can disable the fan control. I'll check back in with you thanks for the help

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[sage0607]

Even if it isn't depinned and is working with the control signal wire , they can throw a soft code as if the ECU can not see it. It's that soft code that the I.E fans on feature does not like. Now, if you have had this same setup (hardware and software) working well together for a while and this just started, then I'm probably barking up the wrong tree. Even so, it's worth scanning the ecu to see if there's a code for the HX pump.

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Cleared the codes and reflashed the ecu and it stopped the problem. I got to go drive it for a while later when I'm not busy, and make sure its all good

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[sage0607]

Even if it isn't depinned and is working with the control signal wire , they can throw a soft code as if the ECU can not see it. It's that soft code that the I.E fans on feature does not like. Now, if you have had this same setup (hardware and software) working well together for a while and this just started, then I'm probably barking up the wrong tree. Even so, it's worth scanning the ecu to see if there's a code for the HX pump.

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Okay so went out to drive my car again and the fans are doing the same thing now again. Is there a way to disable the ie fan control?

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[RoofRails]

Okay so went out to drive my car again and the fans are doing the same thing now again. Is there a way to disable the ie fan control?

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I don't have I.E., but I believe there's a separate add-on when flashing for that feature that is picked when you flash. So you may have to reflash without that feature included.

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[SwankPeRFection]

How long have you had the IE flash and IC pump and when did you develop this fan problem?

[SwankPeRFection]

Doesn’t look like either 034 or IE’s fan control kicks the fans On when the ignition is completely Off. If you’ve turned the engine off and pulled the hey or turned the engine off and opened the door with keyless and the fans are still full blast, it’s not the flash fan control doing it.

- - - Updated - - -

Cleared the codes and reflashed the ecu and it stopped the problem. I got to go drive it for a while later when I'm not busy, and make sure its all good

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What codes did you clear? Did you look?

[sage0607]

How long have you had the IE flash and IC pump and when did you develop this fan problem?

Only started the same day as I did my pump. And I've been on ie for 2 years


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[sage0607]

Doesn’t look like either 034 or IE’s fan control kicks the fans On when the ignition is completely Off. If you’ve turned the engine off and pulled the hey or turned the engine off and opened the door with keyless and the fans are still full blast, it’s not the flash fan control doing it.

- - - Updated - - -



What codes did you clear? Did you look?

I didnt look because it just cleared codes when I reflashed. I don't even know if I had any codes tbh

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[Nillious]

I pulled in my driveway last night and my fans were running after I got out but only slightly. I’d say they were running at maybe twenty percent. I have 034 ecu and tcu. First time I’ve ever heard it in two years of owning it. Tune has been in for a couple months.

[SwankPeRFection]

Only started the same day as I did my pump. And I've been on ie for 2 years


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What’s year S4 do you have and what specific CWA100 pump do you have? The PWM signaling on B8.5 and possibly 2012 B8 doesn’t work on the CWA100-3 pumps, but will work fine on the CWA100-2 pumps. Early B8 cars don’t have a problem controlling PWM on either the -2 or -3 pumps.

Also, I think if you keep your cruise control stalk in the On position (not pushed all the way forward (Off), fan control won’t kick On…. From what I’ve seen I think that’s the control for it.

[evanb]

Also, I think if you keep your cruise control stalk in the On position (not pushed all the way forward (Off), fan control won’t kick On…. From what I’ve seen I think that’s the control for it.

Other way around. The fans will run when the CC is on.

[sage0607]

What’s year S4 do you have and what specific CWA100 pump do you have? The PWM signaling on B8.5 and possibly 2012 B8 doesn’t work on the CWA100-3 pumps, but will work fine on the CWA100-2 pumps. Early B8 cars don’t have a problem controlling PWM on either the -2 or -3 pumps.

Also, I think if you keep your cruise control stalk in the On position (not pushed all the way forward (Off), fan control won’t kick On…. From what I’ve seen I think that’s the control for it.

I actually have a 2012 a6 3.0t but nobody replied to my post there so I posted here instead. I have a mer racing cwa100v3

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[sage0607]

Alright so basically I reflashed stock tune it stopped the problem. Flashed my e40 dual pulley throttle file without the fan flash and it doesn't do this anymore so it is definitely a compatibility issue with the v3 cwa100 pump and the tune on my specific car thanks everyone for the help, and hopefully anyone else with this problem gets help from this as well

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[RoofRails]

Alright so basically I reflashed stock tune it stopped the problem. Flashed my e40 dual pulley throttle file without the fan flash and it doesn't do this anymore so it is definitely a compatibility issue with the v3 cwa100 pump and the tune on my specific car thanks everyone for the help, and hopefully anyone else with this problem gets help from this as well

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How ironic is it that you posted a problem with your A6 in a B8 S4 forum and got help from a guy with a 2015 3.0TFSI Q5... LOL ! One big happy family !!

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[sage0607]

How ironic is it that you posted a problem with your A6 in a B8 S4 forum and got help from a guy with a 2015 3.0TFSI Q5... LOL ! One big happy family !!

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Haha its really helpful cause such problems as this seems to jump out to help which is super appreciated

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[SwankPeRFection]

Alright so basically I reflashed stock tune it stopped the problem. Flashed my e40 dual pulley throttle file without the fan flash and it doesn't do this anymore so it is definitely a compatibility issue with the v3 cwa100 pump and the tune on my specific car thanks everyone for the help, and hopefully anyone else with this problem gets help from this as well

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You may want to do a scan and make sure you actually get a code for the pump. Generally the B8.5 cars would need to cut the control wire on the pump to get it to run at all for the V3. Some but not all B8 cars can run it without issue and actually modulate speed of it like the stock one without throwing codes. I know for certain the 2010 cars can. With VCDS you can actually test the pump and vary speed on it to check it. If it responds properly, then it’s fine. I’m sure you would have noticed major power loss issues by now if it wasn’t running at all.

[SwankPeRFection]

Other way around. The fans will run when the CC is on.

So what do you do when you need to actually use CC?… deal with the fans just being in full blast?

[RoofRails]

So what do you do when you need to actually use CC?… deal with the fans just being in full blast?

It only comes on when you come to a stop and turns off at 5mph. It doesn't interfere with the operation of the CC.

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[Nillious]

The cooling fan control of the 034 tune disable as soon as you start moving.

Edit

Roof rails beat me to it

[sage0607]

You may want to do a scan and make sure you actually get a code for the pump. Generally the B8.5 cars would need to cut the control wire on the pump to get it to run at all for the V3. Some but not all B8 cars can run it without issue and actually modulate speed of it like the stock one without throwing codes. I know for certain the 2010 cars can. With VCDS you can actually test the pump and vary speed on it to check it. If it responds properly, then it’s fine. I’m sure you would have noticed major power loss issues by now if it wasn’t running at all.

I datalogged iats are fine. I have the plug and play harness for my coolant pump. Temps are actually quite a bit lower than with cwa50 so its definitely working

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[SwankPeRFection]

Other way around. The fans will run when the CC is on.

From what I’m finding, this isn’t correct for IE. They’re showing the CC stalk is being pushed forward (Off position) to enable the fans at full speed. 034 is the way you said, where CC On turns the fans to full blast and enables their advanced launch control as well.

[SwankPeRFection]

I datalogged iats are fine. I have the plug and play harness for my coolant pump. Temps are actually quite a bit lower than with cwa50 so its definitely working

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I understand you have that harness, I’m saying even with that harness, it won’t run right on B8.5’s and it’ll throw the code. Anyway, seems yours falls under the working state, so you shouldn’t have any soft codes for the pump.

All the videos I’m seeing shows that with IE, CC in the Off position turns the fans On. This may have been your issue if you keep it Off as one normally would.

[sage0607]

From what I’m finding, this isn’t correct for IE. They’re showing the CC stalk is being pushed forward (Off position) to enable the fans at full speed. 034 is the way you said, where CC On turns the fans to full blast and enables their advanced launch control as well.

For the a6 ie tune is pushed forward for cc aka on position.

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[sage0607]

I understand you have that harness, I’m saying even with that harness, it won’t run right on B8.5’s and it’ll throw the code. Anyway, seems yours falls under the working state, so you shouldn’t have any soft codes for the pump.

All the videos I’m seeing shows that with IE, CC in the Off position turns the fans On. This may have been your issue if you keep it Off as one normally would.

Oh I don't have a b8.5 I have a c7 a6 which would be same as b8 not b8.5 from my understanding.

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[SwankPeRFection]

For the a6 ie tune is pushed forward for cc aka on position.

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Umm, they’re all the same. Forward (towards the dash) is Off, pull to middle is On because when you pull towards you (momentary flip) it will resume the set speed if one was set.

[SwankPeRFection]

Oh I don't have a b8.5 I have a c7 a6 which would be same as b8 not b8.5 from my understanding.

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Right, that’s why I’m saying your pump works with the PMW signal wire still attached on the version 3 pump.

[sage0607]

Right, that’s why I’m saying your pump works with the PMW signal wire still attached on the version 3 pump.

Oh gotcha thought u were saying I had a b8.5 hahah nvm then my bad

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[sage0607]

Umm, they’re all the same. Forward (towards the dash) is Off, pull to middle is On because when you pull towards you (momentary flip) it will resume the set speed if one was set.

That just goes to show you I never use cruise control lmfaooo

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[SwankPeRFection]

That just goes to show you I never use cruise control lmfaooo

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So what I’m getting at is that since IE seems to be CC in the Off position (all the way forward) turns the fans On all the time, this may have been your issue and not some incompatibility with your new pump. If you want that feature, flash it back into the ECU and flip the CC stalk towards you (middle). Cruise will be Enabled but not set and the fans shouldn’t do what they did before. This shouldn’t be an issue unless your OCD and prefer to Lee cruise in Off position when you’re truly not using it. Hope that makes sense. 👍

[sage0607]

So what I’m getting at is that since IE seems to be CC in the Off position (all the way forward) turns the fans On all the time, this may have been your issue and not some incompatibility with your new pump. If you want that feature, flash it back into the ECU and flip the CC stalk towards you (middle). Cruise will be Enabled but not set and the fans shouldn’t do what they did before. This shouldn’t be an issue unless your OCD and prefer to Lee cruise in Off position when you’re truly not using it. Hope that makes sense.

I made sure it off actually it still does it with the feature enabled which is whatever. I dont need that feature cooldown passes are always more effective anyways!

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[evanb]

So what do you do when you need to actually use CC?… deal with the fans just being in full blast?

Basically yeah. I use my CC all the time and always used to leave it on. I'm having to retrain myself.

[sage0607]

Basically yeah. I use my CC all the time and always used to leave it on. I'm having to retrain myself.

No thats not how the cruise control fan control works actually its only if your parked or not moving. Cruise control works same as it would if car is stock.

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