Question about 1999 GMC Yukon Denali

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1999 yukon denali blower motor not working

The front and rear air is not working. I replaced the blower motor relay and the blower motor resistor. I hooked a lantern battery directly to the motor terminals and it runs. any idead what my problem could be. my girlfriend wants her ac really bad and wants to take it to a professional. I would like to fix it myself.

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Check the dash fan control switch. It can be purchased separate from the whole cluster for under twenty dollars. The instrument panel cover comes off gently by hand with the tilt steering in the down position. You have to then unplug the electrical plugs to get it out of the way. The heater ac control panel then comes out by hand far enough to unscrew the heater fan control from the back. Auto Zone may have this part and have the step by step instruction to get the job done if needed. Good luck and hope this helps, if the fuse and relay is good, then it's going to be the switch. Keep me posted, be glad to help. 

Posted on Jun 27, 2009

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My 2003 Yukon Denali no longer blows air from the front Front air vents


Do you know how to do automotive electrical testing ? Videos on youtube showing how to do it . Does your Yukon have manual or automatic Heater/AC system ? Could be the blower motor is bad , blower motor control module (if automatic ) Do you hear the blower motor running ? 2005 Chevrolet Tahoe Blower Not Working Chevy GMC same thing

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I have a 2008 Yukon Denali. There is no power getting to the blower motor. I have tested the fuses and relays, replaced the blower resistor, and straight powered the fan/blower motor with 12V power and the...


Need wiring diagrams in order to learn what is in the
circuit & how it works & were to do your testing

I think most people know that, but have no experience
working with wiring diagrams

I won't go near a vehicle or check anything at all, without
studying a wiring diagram first

You did the component testing part, but you usually do the
power or voltage drop testing & grounds to components first

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If the blower is not working, could be the fan switch on either panel, a relay or resistor for the blower, or the blower motor.

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1 Answer

2003 yukon denali---relay locate for blower


the relay is built into the speed resistor or motor control module ) depends if you have automative or manual heater controls. is automatic it will be motor control module and manual is the resistor module. these units are located beside the heate fan motor. the motor helps keeps the unit cool. just unbolt the module, unplug it and install new one. Just check to make sure the connector is good.. The heat created by the connection sometimes melts the power or ground leads (red or black) and if this is so you will need to replace the pin.

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Where is the blower motor resistor on a '95 yukon


I am pretty sure that a 95 and 99 are the same. On a 99 Yukon the blower motor resistor pack is on top of the air box. Remove the glove compartment door, the blower itself will be on the right side. All the way to the far left on top of the air box there is a plug. Unplug and remove the 2 small screws. With some manipulation the resistor pack will lift out. Hope this helps keep me posted, be glad to help. 

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Check Fuse #3 in the under hood fuse block it is the only common connection I can make.

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chk the fan speed resistors mounted in the fan housing. You should be able to see the wires going into the box with 2 screws holding the resistors in place. Good Luck.

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