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Re: i have a 1989 gmc serria and when i put it in four...
Crawl under truck and on front diff unhook actuator put fuse in if your fuse doesn't blow id say actuator is bad my plow truck did same thing and I think my blower motor stopped too
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Somewhere between your switch and the actuator you have a bare wire rubbing on either the frame or the body making it short out. You will have to trace the wire harness out and fix it. Hope this helps.
Check the four wheel drive actuator on the front axel. It's on the front right side of the front differential housing. It's round with a big hex on it where you would put a wrench, I think it's 1-1/4". Anyway, follow the wires there's a plug about 6 inches away, unhook the wires going to the actuator. Now see if it still blows the fuse, if the fuse don't blow the actuator is the problem. It just scerws out and the new one screws in and hook up the wires. This is a fairly common problem with those trucks. On the early K series GM had the four wheel drive and the heater fan on the same circuit. The actuator would go bad and blow the fuse so now your stuck in the snow with no heat. I think GM changed that in the later years.
Well sometimes is easier to get a new compressor for if you are up to it, you have to remove the pulley and clutch of the compressor to replace the cables.
buy an aftermarket electric pump from Summit Racing and mount it on the frame rail right near the filter....do not waste time dropping gastanks and paying for ridiculous gm type in the tank pumps, the in the tank pump is a giant fock u to the public from the automakers.....remember the little mechanical cam driven two bolt cuteys? 15 bucks and 15 minutes and you were done.... thanks big three!
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