No heat in '91 CQ

[Kneale Brownson]

Isn't that servo motor controlled by a strip of electro-sensitive material
over which some sort of pickup arm slides in response to the signal from
the sensors in the cabin?  Someone was going to try to clean/repair the
strip of material (I can't recall the correct descriptive terminology), but
I never saw a report of their success.  The alternative is to purchase a
new servo motor assembly for something like $60.  That's what I did for my
200q20v.

At 10:33 PM 12/21/2004 -0800, Tony Lum wrote:
>At 11:46 PM 12/21/2004 -0500, Jeff Pereira wrote:
>>I am not getting any heat in my '91 CQ with electronic climate control.
>>
>>Everything else seems to be working fine, but I am just not getting
>>any warm air to come out.
>>
>>Any suggestions??
>>
>>jeff
>>_______________________________________________
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>>quattro at audifans.com
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>
>Hi Jeff,
>
>I'm having a little problem like that in my Mom's '89 100 Avant.  First 
>check to see that the heater valve is open with the heat on.  I'm not sure 
>about the CQ, but on T44 cars (5K, 1C, 2C) the heater valve is vacuum 
>controlled.  The arm on the valve should NOT be pulled toward the vacuum 
>servo when the heater is on.  Now with the heater valve open, hot coolant 
>from the head will circulate through the heater core.
>
>The problem with no heat is that the temperature flap, which is controlled 
>by a servo motor, gets stuck in the cold position.  You can tell that by 
>turning on the diagnostic mode of the CC head.  Pressing the inside/outside 
>temp button along with the off button will put you in diag mode.  Channel 
>'01 displays any faults in the system.  In my case I'm getting a "15" code 
>which says the temp flap position is not matching the programmed 
>output.  You can see the actual flap position of the servo motor on channel 
>8, while channel 9 stores the programmed position.  They're supposed to 
>track each other within 3 units, otherwise calibration is necessary.  Use 
>the up and down temp control buttons to change channels and the in/out 
>button to display the channel reading.  BTW, channel 11 is a built in 
>voltmeter which you can use to get a rough estimate of the system voltage.
>
>The flap control servo motor is erratic, working sometimes, and sometimes 
>it slams to full cold and just stays there.  I took the servo motor apart 
>and the whole thing is run by a little toy like motor.  I'm going to try to 
>clean the motor using R/C motor spray and "comm" drops the way you'd clean 
>a R/C car's motor.
>
>HTH,
>
>
>--
>Tony
>
>'80 5KS
>83 urquattro #900302
>'85 4kq
>'87 5kcstq
>'87.5 coupe GT
>
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