The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

My A/C is on crack! 700 1988

posted by  tmccay on  Mon Jun 16 19:57 CST 2003
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

Thanks to those who offered suggestions on my A/C's bad habit. Sadly, these suggestions did not solve the problem. However, having been fed up with having my dash apart with voltmeter in hand while trying to drive--I broke down and went back to testing. Here is that which I learned and if it saves one person the hors of frustration I suffered, the efforts of my labor are worthwhile.

Seems the manually controled AC system on these cars routes voltage through the resistor pack only on the three lowest settings. On high (="4"), a low-current signal is fed to a standard Bosch type relay mounted just above and to the right of the big green relay one sees when the glovebox is removed. This relay is the "high-speed fan" relay.

And mine was bad. I took it apart and found the spring had failed so that when not energized, the contact would sometimes make a connection and sometimes not. But it would never return to the off pole, thereby never allowing the speed switch to work unless a harsh bump forced the issue.

A new $5 relay and I am back to full control.

I still do not understand why the "0" setting does not turn off the compressor but that is a mod for another day. I have control over the AC and I'm happy for now.






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.