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 

Intermittent heat in 1993 940 900 1993

posted by  lrisius on  Sat Oct 17 05:36 CST 2015
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Sun Aug 17 05:59 CST 2014
[RELATED]

Hi all,
I've got a 1993 940 wagon that has intermittent failures of the heating system. It has what I believe is called the manual climate control system. Just has a temperature knob on the right side of the control unit. No ability to set as specific temperature.

Three mornings ago, I drove it to work and had no heat. The next two days it worked fine. I haven't been able to catch it in failure mode when I have time to look at it. The heater control valve under the hood is relatively new and the vacuum line seems to be attached well. I think the controls between vents, defrost, etc. are working so that would seem to indicate I'm getting good vacuum to the control unit. On the days the heater works, it seems to operate normally.

Any thoughts on what is going wrong or what to look at? It seems most likely to me that it is an issue in the control unit given that when it works, everything seems to be fine. The FAQ talks about some control board/relay issues but these seem to be more AC related.

Thanks!






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.