heating and ac not working at all - AC Auto Repair Help Forum


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heating and ac not working at all

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Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum

johnlynch9457
Novice

Jan 17, 2010, 12:04 PM

Post #1 of 4 (1790 views)

heating and ac not working at all	Sign In

Hi
I just bought a 1993 GMC 1500 and there is no heating or ac I changed the fuse and still nothing at all There is no sound at all from the fan not even any light.
there is a cassett tape install I dont know if this is standrand or not. Any help anyone can give me would be greatfully appreciated More information
its a gmc seirra 4.3 liter pickup truck

(This post was edited by johnlynch9457 on Jan 17, 2010, 4:22 PM)

steve01832
Veteran
steve01832 profile image

Jan 17, 2010, 2:11 PM

Post #2 of 4 (1786 views)

Re: heating and ac not working at all	Sign In

To find the right info I need 2 things, first, is this a K1500 4x4 p/u or a G1500 van? Second, need to know which engine is in it, please provide in liters as these vehicles use 3 different v8 engines.

Steve

johnlynch9457
Novice

Jan 17, 2010, 4:02 PM

Post #3 of 4 (1783 views)

Re: heating and ac not working at all	Sign In

HI
its a 4.3 liter and its a pick up gmc sierra 1500

steve01832
Veteran
steve01832 profile image

Jan 17, 2010, 4:45 PM

Post #4 of 4 (1775 views)

Re: heating and ac not working at all	Sign In

Unplug the blower motor connector and put a test light across the purple and black wires.KEY ON ENGINE OFF. Turn the blower motor on all speeds. If the light doesn't come on at all, probe the purple wire with the test light probe and the ground clip connected to the negative battery post. If the light comes on, repair faulty ground wire at blower motor. If still no light, trace the purple back to the blower motor resistor. Test purple wire with fan to middle speed. If light turns on, repair purple wire between resistor and blower motor. If no light, test yellow wire at resistor. If light is on, replace faulty blower motor resistor. If still no light, post back and we'll go further.

Steve

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