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Bob
The front fan should come on in any instance of the buttons being pushed, its a hot on hot off kinda thing and the signal is recieved direct from the ACC/MCC.
Do you knwo if the front fan is good? that should probly be checked as it not being on could be an issue or just flat broken within itself.
Id recomend reading this in the FAQ
http://www.brickboard.com/FAQ/700-900/HeatingAirConditioning.htm#MCCClimateControlACNotWorking
It sounds like the issue at this point might be comming from the MCC control unit.
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