I have a 2001 Allroad, the heater sometimes wont blow hot air. Sometimes it will. The car engine gets to correct temp within minutes of start up so its not the thermostat. When the heater does blow hot it works great so I dont think its a heater core block or air block. Is there a control valve or similar that can jam or intermittently fail??
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When I adjust the temp setting (on auto) from a hot to cold or vise versa I can hear a small clicking from the dash. This clicks about once a second. The fan also increases speed up and down depending on the temp setting, its around 10 deg C outside here so the fan slows right down when a low setting is entered and blows flat out at a high setting..
Is there one motor for both sides or 2 separate motors?
Thanks very much, i will check this out!! Where would I locate the motor?
Only the glove box needed to be removed so I have checked out the flap motors, one is to change where air is directed to and the other moves when the temp is adjusted up and down. Both of the motors seem to be moving freely and the mechanisms look to be going to their full extents in both directions. Do you have any other ideas??
I have disconnected the motor and can manually shift the levers, it feels like like a flap or door is opening and closing. There is a small amount of resistance through out the motion and it seems to close into place.
Today I will try and flush/bleed the system. I did not think that this is the problem but I am running short on ideas.
The check light does not come on, the dash displays OK after startup. I will do the flush etc later today.....
I have flushed the system and there was no sediment or contaminants, just clean coolant followed by clean water. I have bleed the system again and still same symptoms.
There seems to be very little water flow coming to the heater core, after trying everything I think this is the problem although I cant figure out why there would be a lack of flow. Someone has suggested to try an fit an auxiliary pump before the core to see if this increases the flow into the heater. If this works it would be fixing the symptom rather than the initial problem so its not the ideal solution but worth a try....
Do you have any other ideas???