RE: heating woes, continued

["Titus, Brian (NJAOST)" <BTitus@njaost.ml.com>]

OK, I couldn't resist the urge to run out to the parking lot and try a few
things. Here's what I found: When I switch the CC from 'Off' to 'Auto'
(calling for 72 degrees F), the heater control valve definitely moves its
full travel. So, if there is coolant in the system (and not on the ground),
the engine is warm, the control valve actuates, and the fan blows, why no
heat to the cabin? Blockage in the heater core or hoses? hmm...

> -----Original Message-----
> From:	Titus, Brian (NJAOST) 
> Sent:	Monday, March 23, 1998 9:48 AM
> To:	quattro@coimbra.ans.net
> Subject:	heating woes
> 
> This morning my 885ksq (with automatic climate control) would not deliver
> heat to the vents. Fan is blowing like crazy trying to make the requested
> temperature, but only cold air is coming out of the vents. I believe the
> system thinks it's calling for heat, because the air is not blowing out of
> the dash (A/C) vents. Anyway, I checked the archive, and found many
> references to failed heater control valves. I took a quick look at mine
> and it seems intact; also the coolant in the expansion tank is at the
> right level, so it doesn't seem as though there has been a major leak;
> engine temp guage reads normal. Do the control valves tend to only fail
> catastrophically, or do they simply go bad (get stuck), or does this sound
> like something else (vacuum leak, bad heater core, etc)? Unfortunately,
> I'm at work right now, so I can't really go out and test anything... :-(
> 
> Brian
> 885ksq, 106K miles