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What would cause the heater and ac to just stop working in a 1992 GMC Sierra?

Anonymous

∙ 14y ago

Updated: 10/19/2022

well it could be a number of things 1 a relay switch simple fix should be on driver side under hood in a box with a label to tell you witch relay is witch or it could be the heater valve but that should not affect your ac so its probably a simple relay switch or brooking wire and maby a fuse try that it should fix it just be sure to disconnect your battery first . that should fix it

Wiki User

∙ 14y ago

What else can I help you with?

What would cause the heater and ac to just stop working in a 1992 GMC SIERRA and the light for them to not turn on?

The blower motor speed switch is burned out or the fuse is blown.

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Check fuse if the blower is not working. If it is then replace your heater core. if its not then replace your fan switch.

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Most likely it would be a blown fuse in the fuse block.

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if the rear ac is working then you probably have a damper door that is inoperative. this is in the heater/evaporator box. so if it isn't working then you will be heating and cooling at the same time out of the heater box.

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Would a broken heater cable cause the air cond not to work also Ford Festiva 1997 GLXi?

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No...

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