Suggestions? Auxiliary/Aux Fan ran after engine turned off...
#12
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Join Date: Mar 2011
Location: pa
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Hello to all.. i noticed something in my 96 audi A4Q.
the auxiliary fan keeps running on high. the engine warms up, and the aux fan starts going. it shuts off when the engine is turned off.
also. I noticed that even with the engine running the main fan stops spinning when the auxiliary fan is on. it spins freely, but slows down and just barely turnes, almost stops. I put the car in gear and drive a short distance, and the main fan starts up spinning again normally. then parked/idle, the main fan slows down, auxiliary fan turns on.
I recently had a garage diagnose that there's a bad thermol fan switch.
can't seem to find any other reading about this issue, unless this is normal. any input? or forum links discussing audi fan/cooling.
TIA>.
the auxiliary fan keeps running on high. the engine warms up, and the aux fan starts going. it shuts off when the engine is turned off.
also. I noticed that even with the engine running the main fan stops spinning when the auxiliary fan is on. it spins freely, but slows down and just barely turnes, almost stops. I put the car in gear and drive a short distance, and the main fan starts up spinning again normally. then parked/idle, the main fan slows down, auxiliary fan turns on.
I recently had a garage diagnose that there's a bad thermol fan switch.
can't seem to find any other reading about this issue, unless this is normal. any input? or forum links discussing audi fan/cooling.
TIA>.
#13
AudiWorld Super User
Hello to all.. i noticed something in my 96 audi A4Q.
the auxiliary fan keeps running on high. the engine warms up, and the aux fan starts going. it shuts off when the engine is turned off.
also. I noticed that even with the engine running the main fan stops spinning when the auxiliary fan is on. it spins freely, but slows down and just barely turnes, almost stops. I put the car in gear and drive a short distance, and the main fan starts up spinning again normally. then parked/idle, the main fan slows down, auxiliary fan turns on.
I recently had a garage diagnose that there's a bad thermol fan switch.
can't seem to find any other reading about this issue, unless this is normal. any input? or forum links discussing audi fan/cooling.
TIA>.
the auxiliary fan keeps running on high. the engine warms up, and the aux fan starts going. it shuts off when the engine is turned off.
also. I noticed that even with the engine running the main fan stops spinning when the auxiliary fan is on. it spins freely, but slows down and just barely turnes, almost stops. I put the car in gear and drive a short distance, and the main fan starts up spinning again normally. then parked/idle, the main fan slows down, auxiliary fan turns on.
I recently had a garage diagnose that there's a bad thermol fan switch.
can't seem to find any other reading about this issue, unless this is normal. any input? or forum links discussing audi fan/cooling.
TIA>.
The electric fan should be on low normally for AC, and the second speed should engage if the gauge goes more than one tick over (95C).
Depending on where you live that electric fan should rarely run on the high speed.
If you turn the AC off the viscous fan should be capable of keeping the engine at normal temp.
I think you need a new viscouus fan clutch and the electric fan is taking the extra heat load.
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Nop (06-17-2021)
#14
AudiWorld Super User
My '96 needed a viscous fan clutch last year, and went to AutoZone in desperation because the original was chattering. It was around $80 and seems to work fine, just remember the nut loosens "clockwise". I also was surprised to hear the fan's air sound when in stop and go traffic, which I hadn't noticed with the worn-out original part.
#15
AudiWorld Super User
My '96 needed a viscous fan clutch last year, and went to AutoZone in desperation because the original was chattering. It was around $80 and seems to work fine, just remember the nut loosens "clockwise". I also was surprised to hear the fan's air sound when in stop and go traffic, which I hadn't noticed with the worn-out original part.
Scored one off of a totaled low mileage Passat v6 for $30. Eureka!
#17
AudiWorld Super User
As long as you don't need the AC or defrost you could drive it for a while.
In demist mode the AC runs to dehumidify the air going to the screen.
Last edited by AudiMick; 05-07-2011 at 11:49 AM.
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