Compression Ignition Addict
Join Date: Dec 2008
Location: port arthur texas
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The quickest way to test the relay is swap it with another one of the matching relays, if the relay is bad whateverer you swapped it from will quit working.
The quickest test for the a/c contol module and the termosister, is unlug the lead to the blower motor and hook a dvom to the lead and cycle the contol switch. You should get battery voltage on high and then decrease incramentialy the slower speed you select.
If no voltage on any setting then the contoler is bad. If voltage is lost on any other speed it is probably the thermosister. To test remove the 2 screws and pull out the thermosister from the air box. It will have 3 elements of varing gauge wire. When voltage is applied they become like a heating element so do not touch with fingers you will get burned. The biggest wire is slow and the smallest is high. You should get 12vlt on one side and reduced voltage out the other when you cylce the control switch on each element.
A quick test for the motor is with a jumper wire touch the motor pin with bat voltage if it runs its good.
Lord I shall lead them to the water but I will not try to make them drink
Last edited by dannyboy950; 04-05-2012 at 08:38 PM.