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 

ANSWER If it's like my '93, it's *not* meant to be on whenever the A/C runs .... 200

posted by  Ken C on  Fri May 25 09:47 CST 2007
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 11:39 CST 2014
[RELATED]

I have two '93s, and when I first got my first one, I was surprised that the fan wasn't running whenever the A/C was switched on. But looking at my (Volvo "green" book's) wiring diagram for the '93 model year, it's easy to see that the fan is *not* supposed to work like I (and you) initially expected.

I think your '91 is like my '93 (but I'm not sure, as I've never seen a '91 wiring diagram).

It's controlled by a relay (in the '93, on the driver's side fender's relay support bar) that's activated only when an A/C pressure sensor (actually, a switch called a "presso-stat") closes from high pressure. So the fan should properly work intermittantly if at all, and only when A/C pressure is high. In cool weather, the fan may not even turn on at all.

That pressostat is located (again, on my '93, and maybe on yours, too) on a Y-branch (like a railroad side track) from the main A/C line -- look down under the lower (output, or return-to-engine) radiator's coolant hose, where you'll see a metal A/C line terminate on an electrical connector.

If you want to test it, remove the plug (depress the wire to release it) and put a paper clip across the terminals -- the fan should start, showing that the relay and fan motor are good.

Hope this helps.

This post has been marked as an answer to the original question.

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.