Re: anyone with 88 90, help please

[vjokic@iaw.on.ca (V. Jokic )]

>
>Could anyone with an 88 90 please help me out here.  I am on the verge
>of diagnosing my relay/wiring problem with my AC.  IF any would be so kind
>as to go outside and undo their underdash panel and then check the
>voltages on the lines of the relay for the AC control unit when the AC
>is on and off, I would be forever in your debt.   It is part no 443 919
>578 G on mine.  THanks so much for whoever endevors in such a task.
>Rob
>randrews@post.smu.edu
>
>
>


I am not sure that I could help you since I have an 88 90Q what does not
necessarily have the same AC controls as an 88 90. I took some measurement
assuming that layout of my relays is exactly as shwn on the fuse-relay box
cover. I do not have any manuals to confirm this.
Accirding to layout on the cover, relay called AIRCONDITIONERS RELAY is
located as last one counting from left to right in the first relay row
(close to the driver). It has type designation as 214, rated 40 Amps, and
the part number is 443951 253 K.
The masurement is taken while engine is running and the relay unpluged.


AC ON

coil (terminals 85 $ 86)     voltage = 13 V (full battery voltage)

contact (terminals 30 & 87)  voltage = 13 V


AC OFF

coil         voltage = 0 

contact      voltage = 13 V (does not change)


However, the funy and confusing thing is that Airconditioner is normaly
working (if switched ON) when this relay is unpluged!! Therefore, it doesnot
suplly power to the AC clutch, or AC controls, nor to the cooling fan that
is permanently running when AC is ON. But it does pickup (gets energized)
when AC is turned ON... What the contact does, only Audi gods know, or maybe
somebody with Bentley.

I also checked the function of a neighbor relay called 213, located left
side of the above relay (one before last counting from left to right in the
same row), rated 70 Amp and part No is 
443 951 253 J. Description on the cover is RELIEF RELAY. When unpluged it
kills everything, AC, cooling fan, ventilation (blower) fan and AC controls
(light on the AC button dissapears). 
The measurement gives the following results (relay unpluged):

Coil:  gets the voltage (12 V) as soon as the ignition switch (key) is ON
(engine does not have        to not run).

Contact:  permanently enegized, (12 V) even when ignition key is taken out.

If this has any similarities with yor car, I am willing to take same other
measurement if that could help you out. Good lack anyhow.


Regards,

Vlajko Jokic

St. Catharines, Canada