[s-cars] heater problem

[Fred Munro]

Jerry;

By design, hot coolant always runs through the heater core. The cabin
temperature is controlled by flaps inside the box which mix hot and cold air
to maintain the temperature set point. If the flap mechanism, drive motor,
or positioning pot is screwed up, you may only get cold air.
There are two rubber hoses about 1" in diameter running up through the
firewall from the back of the engine to the heater box. Feel these hoses to
make sure they are hot - this indicates coolant is going to the heater core.
Run a diagnostic on the climate control unit - the Bentley tells you how and
what the trouble codes mean.

HTH

Fred Munro
'94 S4


-----Original Message-----
From: s-car-list-admin at audifans.com
[mailto:s-car-list-admin at audifans.com]On Behalf Of Jerry Scott
Sent: November 4, 2003 8:49 PM
To: s-car-list
Subject: [s-cars] heater problem


I turned on the heater in my 93 S4 today and only cold air came out.   I
tried the Auto setting and the manual setting but no change. All of the
controls seem to work just fine including the blower, but no heat.  The
car water temperature  seems to be in the left third of the gage.  Is
this normal?  I'm thinking it may be the thermostat, but when I feel the
radiator hose under the hood, it is seems hot enough to run the heater.
Any ideas?
Jerry


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