Tdi blowing very hot air constantly

Ewan

Ewan

Member
Hi
My tdi is now blowing hot air all the time even when you have temperature at lo or 18, it never seems to change.
I imagine a thermostat but would like advice to be sure before being ripped off!
Thanks in advance
 
I think this is something to do with the mechanism that controls the flaps inside the car. It happens on mine intermittently. There is a thread on it somewhere but I have given up trying to use the search here,
 
Yes, probably the temperature flap motor. It moves a flap to mix hot and cold air to control the cabin temperature.
A VCDS scan would confirm.
Use Google search with the prefix a2oc followed by you problem, it " a2oc temperature control flap" to get more info.
Mac.
 
You're not alone: completely out of nowhere my TDi switches to 'Texas' mode, usually at the beginning of a 250 mile journey. Next day it's sorted itself and I forget all about it until it does it again ...
 
Hi @Ewan
Do you know if you have electrical aux heater or Webasto diesel heater?
Have you tried to push the "ECON" button, and see if that helps.
Do your engine coolant temp gauge shows stabile 90 deg C ?
Cheers
dieselfan
 
You can try the RSI exercise of sitting in the car with the engine running and constantly selecting the temperature LO to HI and back again SEVERAL times to hopefully free of the stuck actuator ( hopefully ). If you drop the glovebox and look up into the gap on the left of the upper center dash you should see the temp actuator moving as you change the temperature. Silicone grease on the exposed gear teeth may help but it is usually the inner end where the motor is that is the problem.

VCDS will give the normal errors due to the climate, but there is a function in VCDS that moves the flaps through their range.
 
audifan said:
You can try the RSI exercise of sitting in the car with the engine running and constantly selecting the temperature LO to HI and back again SEVERAL times to hopefully free of the stuck actuator ( hopefully ). If you drop the glovebox and look up into the gap on the left of the upper center dash you should see the temp actuator moving as you change the temperature. Silicone grease on the exposed gear teeth may help but it is usually the inner end where the motor is that is the problem.

VCDS will give the normal errors due to the climate, but there is a function in VCDS that moves the flaps through their range.
Click to expand...
The VCDS test is HVAC Controller Test. Only available with licensed version (inc vcds-lite).
All the above "fixes" are worth a try, but failure of the motor requires replacement.
There was a recent thread where someone was going to investigate taking the motor apart to fix it. Not sure if this happened though. Motor failure is common on older audis.
Mac.
 
audifan said:
You can try the RSI exercise of sitting in the car with the engine running and constantly selecting the temperature LO to HI and back again SEVERAL times to hopefully free of the stuck actuator ( hopefully ). If you drop the glovebox and look up into the gap on the left of the upper center dash you should see the temp actuator moving as you change the temperature. Silicone grease on the exposed gear teeth may help but it is usually the inner end where the motor is that is the problem.

VCDS will give the normal errors due to the climate, but there is a function in VCDS that moves the flaps through their range.
Click to expand...
Hi
I tried that and it worked, thanks for the info

cheers Ewan
 
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