CHEVY 4 WHEEL DRIVE-A/C,HEAT

1988 Chevrolet Truck

Tiny

rudy910

November, 27, 2009 AT 9:23 AM

Transmission problem
1988 Chevy Truck V8 Four Wheel Drive Automatic 150000 miles

when u shift 2 4wheeldrive it blows the fuse for a/c, heat

FOUND 6262 RELATED QUESTIONS

4 Wheel Drive

2 ANSWERS
1 IMAGE

11 Answers

Tiny

Dr Loot

November, 27, 2009 AT 5:46 PM

You got me, I have never heard of that problem, are you sure your diagnosis is correct?

Tiny

rudy910

November, 29, 2009 AT 12:23 PM

Yea im sure my diagnosis is correct. It always blows the fuse and the 4wd dont work when that happens

Tiny

Dr Loot

November, 29, 2009 AT 12:57 PM

I am sorry you are correct, I was checking the wiring diagram on your truck, the AC/Heater fuse is connected to the trans-case, it get its power Supply from the speedo fuse, my question now is, dose your speedometer work? If it does. Most likely it is this which in the transfer case, that is grounded in other words, it is no good. Because every time you put the transfer case in 4 Wheel Drive. The fuse blows.

Tiny

rudy910

November, 29, 2009 AT 1:35 PM

Yea my speed ohmeter works. We finally figured it out. Thanks for the help

Tiny

hildy43

January, 24, 2011 AT 1:43 AM

How did yopu fix it I have this prob now!

Tiny

Dr Loot

January, 24, 2011 AT 2:32 AM

Replaced (VSS) on the back upper side of transfer case, make sure you wiring harness is not damaged. Let me know if you need anything else.

Tiny

hildy43

January, 24, 2011 AT 3:16 AM

What is a vss? When I unpluge the indicator light from under the truck my heat works fine but I dont think I have 4x4 yet?

Tiny

hildy43

January, 24, 2011 AT 3:17 AM

My truck is also a 5 speed.

Tiny

Dr Loot

January, 24, 2011 AT 3:45 AM

5 speed manual?

Tiny

hildy43

January, 24, 2011 AT 3:54 AM

Yes

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