Question about 2003 Chevrolet Silverado 2500HD

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Nothing coming from the vents when you turn on the a/c, heater, or defroster

Recently when I try to turn on the a/c, heater, or even the defroster nothing comes out of the vents for any fan speed setting. Previously my 5th fan speed setting (which is my highest) wouldn't work now suddenly none of them work but I can hear the compressor kick on like normal and the defroster kick on normally. Before I spend the money on the parts I just want to confirm what part I really need. A new blower motor or a blower motor control module resistor?

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  • 34 Answers

You can jumper the fan motor to make sure it runs and if it does then look at the switch or resistor. You can also remove the resistor and omh acrossed it to make sure that it hasn't blown the fuse on risistor.

Posted on Feb 11, 2014

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Posted on Jan 02, 2017

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keemo68
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SOURCE: 2004 Chevrolet Silverado Heater/AC Blower on without Ignition ON

there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate

Posted on Oct 04, 2008

  • 63 Answers

SOURCE: 2003 Trailblazer No air from front face vents

first check to see if you have power going to the actuators when you switch the switch to it location if no power replace controller if you have power and no movement from actuators replace actuator. if actuators move remove hvac box and check for broken blend doors.

Posted on Jan 22, 2010

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SOURCE: Blower motor or resistor?

Yes its the blower motor resistor.

More then likley theres some trash or something in it, or possibly the motor itself is on it's way out. There not that bad to pull out of that body car, just pull it out and see what you can see.

The blower motor is under the glove compartment

You can replace the resistor on your own. Please find a detailed diagram which would guide you to do it.

http://autorepair.about.com/library/images/bl629a-lib.htm

Thanks

Posted on Apr 09, 2009

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1 Answer

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