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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Resoldering my A/C Control Unit 700 1992

posted by  someone claiming to be Brian Oliver on  Thu Mar 7 03:56 CST 2002 [RELATED]

I did this repair a couple of years ago. In about the middle of the circuit board there is a black plastic box, probably the largest component there. I think it is the main relay which switches the compressor clutch current, but maybe not. On the solder trace side of the board, you may find barely visible cracks in the solder holding this part's pins to the copper traces. I found my cracks easily by taking off my glasses and holding the thing to my nose, but I am very near-sighted. I you are not, try a magnifying glass.

Once you find suspicious solder, you need to "reflow" the metal with a soldering iron until it is smoothe and shiny, possibly adding a but more solder while you are at it. The small electronics soldering iron may not be powerful enough, but be careful you don't over-do it if you use the big gun-shaped tool.

Be open-minded about where on the board to look - I think these solder failures might be partly due to temperature extremes (cold winters?), not just high current, so could occur anywhere.

Good luck.






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.