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Old 02-23-2010, 11:21 AM
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Default heat control issue

I have a 2002 chevy tahoe and the heat works but the control switch only works on 3, 4 and 5. 1 and 2 do not work, no air blows out of the system. once you switch it to 3, 4 and 5 it works normally. is there a fuse or something that is causing this? and where do i locate this fuse at? i have searched online and cant seem to find it. thanks guys.
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Old 02-23-2010, 11:30 AM
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Quote:
Originally Posted by Memphistahoe02 View Post
I have a 2002 chevy tahoe and the heat works but the control switch only works on 3, 4 and 5. 1 and 2 do not work, no air blows out of the system. once you switch it to 3, 4 and 5 it works normally. is there a fuse or something that is causing this? and where do i locate this fuse at? i have searched online and cant seem to find it. thanks guys.

this maybe something completely unrelated but i know colorado's have this problem... Its the harness that plugs into the blower motor and the blower motor resistor.. It shorts out and cooks the resistor. It will work for short periods of time if you wiggle it so its tight.

If you get desperate its something to look into.

Otherwise you could just start checking things on the back of the control w/ your dmm to see if its in the control, before, or after. Just see if you can find a wiring diagram for it first.
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Old 02-23-2010, 11:40 AM
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Originally Posted by profundus-sanus View Post
this maybe something completely unrelated but i know colorado's have this problem... Its the harness that plugs into the blower motor and the blower motor resistor.. It shorts out and cooks the resistor. It will work for short periods of time if you wiggle it so its tight.

If you get desperate its something to look into.

Otherwise you could just start checking things on the back of the control w/ your dmm to see if its in the control, before, or after. Just see if you can find a wiring diagram for it first.
wheres the blower motor at in the vehicle? driver or passenger side?
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Old 02-23-2010, 11:41 AM
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It is called a blower motor resistor it is located usually on the back of your firewall with a one wire plug in. replace that and all your speeds should work.
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Old 02-23-2010, 11:43 AM
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It is called a blower motor resistor it is located usually on the back of your firewall with a one wire plug in. replace that and all your speeds should work.
passenger side im assuming?
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Old 02-23-2010, 11:45 AM
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yes sir , if not there sometime's they can be located sometimes behind your glove box. it will look like a one wire plug in going into there are usually 2 screws holding it on and when u pull it out it look's like an electronic card about the size of a buisness card on the new style ones on the old style chevy's etc.....there just a whole bunch of springs looks like in a certain order.
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Old 02-23-2010, 11:47 AM
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alright thanks man. gotta figure this out. my brothers truck the same thing happened in it and now mine just went last night.
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Old 02-23-2010, 11:47 AM
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yeah man im almost 95% sure its the blower motor resistor
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Old 02-23-2010, 11:49 AM
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those are good enough odds for me. i just ripped apart my truck yesterday and now get to do it again!
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Old 02-23-2010, 11:51 AM
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Been there man it happens , if u try the blower motor resistor and that's not it lmk what happens? the resistor also doesn't have to look burnt could b it short circuted it happens over time. hope that helps ya though bro
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