Question about 1999 GMC Sierra

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Replaced heater blower motor and resistor still not blowing heat

Replaced the blower motor and the resistor going towards the blower motor and still fan will not blow on any setting.

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Had this problem which took a couple different directions. First was very simple...the control knob was turning on the shaft,, it had rounded off. Put some glue on it and worked for a year until problem like you described arose again. Replaced all components like you did but had intermittent blowing. Replaced blower again which solved problem...for now anyway...defective NEW blower.

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

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SOURCE: Blower Fan will not blow, we have already replaced Heater Control

you need to replace the fan ...its under the hood on the passenger side held in bt 3 screws and one plug this is the only motor on that side of the vehicle and only takes a half hour to change out

Posted on Jan 25, 2009

  • 34 Answers

SOURCE: 7 wire harness going to blower motor resistor

There is an updated resistor/connector package. Very expensive from GM, try your local NAPA or other parts supplier for a replacement

Posted on Jul 09, 2009

  • 1201 Answers

SOURCE: 2000 Chevy Silverado doesn't blow air on any settings

The only thing I can think of is, try replacing the relay switch for the blower motor, you replaced everything else, and you didn't mention that. I'm not saying this will work, but it's the only thing that's left.

Posted on Jul 14, 2009

  • 69 Answers

SOURCE: 2003 Chevy AC Fan Blower Motor troubleshooting

first check the fuse or relay.. this will be the cheapest sollution and easiest to check.

Posted on Jul 31, 2009

  • 5 Answers

SOURCE: How do you replace blower motor resistor on a 2004

Here is how to change the resistor- but also pay attention-
Did you also change the connector at the same time?
If you are changing the resistor due to overheating and melting of plastic, then you need to do the connector also, or else it will repeat fail in a very short time.

Here is a step-by-step check you can do to fix it. If you are onlygetting high speed (setting 5), then most likely you have a resistorproblem, or the wiring connector to the resistor is bad. The groundwire prong being bad is a possible cause.

Check this for step-by-step checks:

http://www.sparkys-answers.com/2008/07/2005-chevrolet-silverado-blower-inop.html

Posted on Sep 19, 2009

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How do I change heater fan


It would help to know the make and model. Different manufacturers put them in different places and mount them different.

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on most vehicles when the heat stops blowing it's usualy not a fuse or a relay but the blower motor or the blower motor resistor.
Here is a good way to check if it's the blower motor. Disconect the plug going in to the blower motor, Now run two long wires from the battery one on the negitive and one to the possitive. put power to the blower motor with theese wires, negitive to one post and possitive to the other .Does'nt matter what post you hook to the blower motor will just spin the opisite way. if the blower motor spins then you can rule out the blower motor and suspect the blower motor resistor is bad. to find the blower motor resistor all you have to do is follow the wirring from the blower motor. The resistor will be at the end of the wirring for the blower. The resistor will be mounted on the heater box near the blower motor and is usually held in by two screws.

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