Question about 2003 Chevrolet Suburban 1500

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2003 Suburban heater fan will not working.

2003 Suburban heater fan will not run. Checked blower fuse under the hood and htr/ac and hvac1 fuse left side of the dash.

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1st attach a test light from negative battery terminal to voltage wire at blower motor and test for power
2nd attach a test light from positive battery terminal
to ground wire at blower motor and test for ground

if both tests light the test light suspect blower motor
if no ground suspect resistor
if no power suspect short in voltage wire
these vehicles are known for burning out the wire
connection at the blower motor look for discoloration
at the plug
i hope this helps

Posted on Dec 10, 2009

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If the fuse was good which you didn`t mention if it was or not. the usual problem for this is the blower motor resistor which is next to the blower motor on the passengers side.

Posted on Dec 10, 2009

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Three things left to check,
using test light see if you have power at motor with key and switch on,if you do replace motor,if not locate blower motor resistor it will be close to motor,check for power going in,last is the heater control assembly

Posted on Dec 10, 2009

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1 Answer

HEATER NOT WORKING ON 03 YUKON


Heater not working ???? Blower motor not working , no air blowing out of the vent's. defrost , floor ? I'm assuming you have the manual HVAC - climate control system , by the fact that you replaced the resistor assembly . Was there a relay included on the resistor assembly ? What fuse's did you replace ? HTR/AC - 30 amp. left I/P fuse box , BLOWER fuse -40 amp - under hood fuse box ? Did you use a DMM - digital multi-meter an test for B+ voltage at the purple wire at the blower motor ? The fuse's you replaced ,check for B+ voltage with meter .
Your vehicle could have two different HVAC systems , manual & automatic. The automatic system doesn't have a resistor assembly , has a blower motor control processor. Do you know how to test automotive electrical circuit's ?

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Hi,

Thanks for using Fixya!

check the wire terminals from the fan motor, its possible that they are loose. Also check the relays if they are good. Just swap out the other relays to test if it will work. These relays can be found in the fuse box under the dash or under the hood.

Have a great day.
- HotRatchet

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No AC, heat, or vent


it sounds to me that you might have a small short,and (or) in line fuse,(you can't see), might have blown, go to your nearest advance,kelly,or auto zone (it's Free), and have them run a Code test on it, and let me know what code errors it throws, god bless

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Heater blower motor resister is bad, replace, located under dash above heater motor.

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