[A4] Heater Issues

Yee, Phil Phil.Yee at rainin.com
Tue Jan 31 17:37:57 EST 2006

the compressor is running fine, with and without heat.  the thermostat also
looks good.  it was changed, and all the hoses heat up fine.  i've even
driven without the battery/firewall cover off just so i could jump out and
feel the temp of the heater hoses into and out of the heater core.  once my
water temp gage needle barely moves off the cold side, both hoses are nice
and warm.  thanks for the suggestions.
-----Original Message-----
From: Brizax at aol.com [mailto:Brizax at aol.com]
Sent: Tuesday, January 31, 2006 2:31 PM
To: Yee, Phil; a4 at audifans.com
Subject: Re: [A4] Heater Issues

make sure the AC compressor is in fact running when you turn the heat on,
you will hear what it sounds like if you have the car running and switch it
off and on with the hood up, then try heat, listen to see if the compressor
is running, otherwise make sure your thermostat is good and not gone or

Just had the timing belt job done on my 01' 1.8T, at a supposedly reptuable
independent shop.  Immediately after, the cabin heater doesn't heat up.
Also for about a week, the water temp gage looks like it has a bad sensor or
maybe an air bubble: needle jumps between cold and midway even after warm,
but this eventually goes away and works fine after I bleed the air a few
times.  After bringing it back for the heater issue, they tell me that hot
water is circulating just fine, temp sensors are fine, the heater flap motor
is responding to their VAG-com fine, but they suspect that the AC head unit
is bad.  During use, the AC head unit seems to work fine, except for the
lack of hot air coming out of the vents.  This sounds reasonable enough to
me, but the timing with the TB/T-Stat/H2O Pump job and the temp gage seems
wrong to me.  Has this happened to anyone?  Any ideas?  Any things to check
before I order (and change myself) the big $$$ AC head unit?


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