2000 GMC sierria 1500 - Heater will not turn off.

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ddkput
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Joined: Mon Feb 17, 2014 1:15 pm

2000 GMC sierria 1500 - Heater will not turn off.

Unread post by ddkput » Mon Feb 17, 2014 1:25 pm

heat blower will not turn off using the selector or with the key off or removed. This happened 2 weeks ago and it killed my battery. Recharged it and problem went away. Today it happened again. while trying to find a solution I removed the 30amp front HVAC fuse from under the hood in the electrical center. This finally shut it off. when i reinstall the fuse it starts blowing again even with the key in my pocket. what could it be???? Blower motor Relay?????

 

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carriedi
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Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: 2000 GMC sierria 1500 - Heater will not turn off.

Unread post by carriedi » Mon Feb 17, 2014 4:58 pm

it could be the blower resistor. they resistor used to be a series of cois use to reduce the fan speed. Now it's a small module. The module can short to power and keep the blower connected to the "power all the time" battery connection.
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resistor.jpg
GMC Blower motor resistor module.
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ddkput
Posts: 2
Joined: Mon Feb 17, 2014 1:15 pm

Re: 2000 GMC sierria 1500 - Heater will not turn off.

Unread post by ddkput » Thu Feb 20, 2014 11:01 am

I did some troubleshooting and thats what i found. If i diconect the 30amp fuse under the hood the blower will now shut off it just will not work on five or high. I guess setings 1 thru 4 are fuse in the dash board 25 amp fuse and the 5 or high setting is the 30 amp under hood. this will work for me until I have the $$ and the time to replace the resistor module. Thanx

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