Question about 1999 GMC Yukon

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1999 GMC Yukon - Blower only operates on high. I

1999 GMC Yukon - Blower only operates on high. I assume it is the blower motor resistor but I can not find it.

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  • Anonymous Mar 25, 2014

    turn engine off still runs you cannot change the speed stays on high

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On these models on the harness that plugs into the fan switch goes bad, I changed the switch and found this harness melted together on my 99 yukon

Posted on Jul 19, 2009

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It can be the blower motor switch or the blower motor itself.

Posted on Jul 12, 2009

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1 Answer

Blower motor resistor location on a 1999 gmc yukon


https://www.youtube.com/watch?v=gj4hw-HR3n4

Mar 01, 2015 | 1999 GMC Yukon

1 Answer

2004 yukon xl the fan only works on high. was told it is the resistor. where is this resistor located?


the resistor is located in bottom of heater box under right side of dash it will be close to blower motor. the wires from blower motor go to resistor. check the plug and replace it as well they tend to melt

Mar 12, 2011 | 2004 GMC Yukon

1 Answer

Trying to locate where the heater relay that hooks to the blower motor is located


It is mounted on the fire wall in a block of two or three relays depending on what equiptiment is standand in your vehicle.Its toword the left side near the ACand the blower motor units Like i said it depends on what you have some are intergrated into the motor . But if you have splice # S108 the goses to the relay and splits and goes to blower motor resistor unit then its the one on the far right hand side of the block. There all interchangable and work exactly the same. However the blower motor relay directs bat voltage to the blower motor olny at blower high speed setting.The blower motor resistors direct battery voltage at all other speed settings. S o in a nut shell if it works on high the relay is good and its the resistors or a connection issue. Try the connections first thats the most likely problem if you olny have high speed

Jan 21, 2011 | 1999 GMC Yukon

1 Answer

Blower only works on high now,and sometimes cuts in and out.


The 99 uses a resistor to adjust blower motor speeds.
this is a common issue, the blower resistor is prone to corrosion, and overheating, with a possisbility of melting the electrical connector. This resistor is mounted under the passenger foot area, above the trim panel below the glove compartment. Once the panel is taken down,(with 3 7mm screws), you can see the resistor. It is rectangular,with 2 sets of wiring going to it. one is a 2 wire to the blower motor, the other is a 6 wire, that has power feeds. Unplug the larger connector, to check for any melted terminals, or burnt plastic. If damaged, it would have to be replaced, the resistor has to be replaced either way. Both available at a Chevy, or GMC dealer

Dec 07, 2010 | 1999 GMC Yukon

1 Answer

Replaced the blower motor resistor, the air still blows through the defrost vents. Fuses are ok, what should I do next?


the blower motor resistor is for the speed of the blower not the direction of air flow you need to check the operation of the air flow direction control flaps

May 27, 2010 | 1999 GMC Yukon

1 Answer

Blower motor works intermittantly


Check the blower motor resistor module.It is by the blower motor on the passengers side under the dash.Check the connector for it getting hot and not making good contact.These resistors are known to go bad.Hope this helps.Good luck.

Mar 11, 2010 | 1999 GMC Yukon

1 Answer

Heater fan on 2002 Yukon does not operate in front, only rear.


The front blower motor is controlled by the blower resistor module.This is usually the problem with the front blower not working.I looked up the schecmatics and I don`t see separate fuses for the front and rear.But the fuse for the front blower is in the under hood fuse block.If this is good then The problem is probably the resistor module.It is next to the blower motor.The connector from the resistor connects to the blower motor.If you want to confirm this you can check for power and ground at the blower motor connector when you activating the blower switch on.This can be done with a test light.Make sure you have power going into the resistor module also.If you have power going in and no power at the blower motor then replace the resistor.Hope this helps.Good luck.

Dec 28, 2009 | 2002 GMC Sierra C/K1500

1 Answer

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. 

Jul 04, 2009 | 1999 GMC Yukon Denali

1 Answer

1999 yukon denali front blower motor not working


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

Jun 28, 2009 | 1999 GMC Yukon Denali

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