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Hi, my 1988 Ramcharger 318 727 ac/ air/ heater control unit has stopped working. Any tips on what the problem could be? This is the in-cab unit that turns on /off the air. Also is there a after market replacement that would be an easy swap? The fuse is good.
First it would work here and there, stay on low when moved to high flow, vent would work bit not ac or vise versa, now it is completely not working.
 

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is the fan is what your speaking of ?  if so there are a few places to check , first simplest , is the resistor at the heater box . open glove box door , push / squeeze down on the "catch" that stops door's travel , and it will over open , exposing the heater box , find the wire connector that seems to plug into the heater box itself , test there for power 12 v when switch for a/c blower is on and key is ON . post results .
 
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