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Heater stuck on wont switch - 2002 GMC Envoy

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check all your fuses and fusable links, also check the body computor

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Heater will not switch to defrost stuck on 1 position


when the heater controls are stuck on one setting it could be the foam on your mode door valve so it wont properly switch causing it to only be on one setting. or its the mode door actuator but the major problem is the foam on the door it self there is a seal kit you can get to fix the problem p/n 89018656 but you have to take some of your dash apart to get to it its not to bad if you just have to replace the foam. an 8 hour job or so if you have to replace the whole actuator

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check the mechanism of the vents, it could be stuck or not working.

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Are the different speeds working on the blower or is this stuck on just one speed ??? It seem as if the relay for the blower is fused together in the on position an can no longer be controlled by the switch. If this blower is not a relay controlled unit then most likely the blower switch is no longer working.

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My vent is stuck on floor position and heater control assembly wont switch to dash were do i start to fix problem on 83 cutlass supreme


The thing to do is check for vacuum leaks. In the engine bay look for any "hoses" coming from the firewall. These are for the heater contols. If any of these are broke? Replace them . Have you installed a after market radio? Sometimes heater controlls get messed up. I would take the radio out and examine the heater controlls.

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could be your heater cor or just low on fluid if the truck over heats as well could be your thermostat stuck closed if does not over heat could be stuck open

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1 Answer

My heater is stuck on defrost. I switched the


look under the hood on the passenger side for a broken vacuum line. this is usually a white plastic or black plastic tube. you can splice it together with a small rubber vacuum hose.

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problem could be in the mode switch + check fuse to heater and ac mode switch.if blown your air door wont open and let heat enter inside car.if fuse look good you could have faulty mode switch.if you have climate control if you have a bad in vechicle sensor that will effect air door to open let heat in.this problem would be best for dealership.if dealing with climate control units.you need a quick fix.too cold outside not to have heat in car.

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1998 for taurus heater wont blow hot air only cold .was driving down the road I TURNED THE HEATER OFF FOR A COUPLE MINUTES WHEN I TURNED IT BACK ON IT WOULD ONLY BLOW COLD AIR.IT IS ELECTRONIC SWITCH'S.THE...


you need to check the blend door in the heater box it maybe broken or stuck.the blend door switches between the heater core and ac evaporator to provide a mix of temperature

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1 Answer

Blower wont turn off


If you turn the key off and it wont shut off the heater then there are some interesting things you need to check. The first would be the whole ignition switch. When you shut off the key, the power should stop to that accessory. If that is okay then you need to check the controls for the heater. The issue with no heat is one of a blend door being stuck and this could be the controls again.

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