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MCC Interchangeability 700 1991

posted by  VolvoSteel on  Wed Sep 28 22:07 CST 2011
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last visit: Sun Mar 23 21:28 CST 2014
[RELATED]

I have finally figured out the issue of my MCC not working and it was not in the FAQ so this should be added.

After re soldering and replacing the relay i still had no luck in getting the A/C to function ( kick the compressor on ). I checked wiring and everything in between and all was working as it should. i have 2 MCC units, one with a Snow Flake logo and another said A/C Off. both were identical otherwise. ive spent about 15 hours total trying to solve this mess, I took a good hard look at how this A/C button actually functioned, i noticed it relied on the Turn Knob in the middle which controls the vent's and defrost, after turning one of the units to defrost i heard the compressor kick, it still would not kick with the A/C button, i took the complete knob assembly from the other unit which i determined to have a bad electronics board and put it in the one which kicked on when in defrost mode, this required un soldering the 2 black or Red wires ( depending on Snow Flake or A/C Off button ) and re soldering them to the other board. i installed the unit once more and it worked! So please add to the FAQ that when all else fails it could simply be the Vent Control Assembly that is preventing the A/C button to function.

See photo here
http://www.brickboard.com/IMAGELIB/volvopic.htm?js_link=1&id=10134






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