Question about 1999 GMC Safari

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Air conditioner fan runs on high only - 1999 GMC Safari

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Check the blower motor resistor pack.
This is usually located in the blower motor ducting in the air stream.

Posted on Aug 01, 2009

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On my 2004 canyon when I turn the fan on (settings 1, 2, or 3) it will run for a while then kick off and as soon as I put it on setting 4 it comes right back on but will not work on any of the lower settings.

Posted on Sep 26, 2011

  • Boomer_Sooner Sep 26, 2011

    Also it just started making a humming noise. the higher the setting, the louder the humming is.

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Related Questions:

1 Answer

3 speed fan barely changes speed


You are talking about your blower fan for the air conditioner and heater right? More information will be needed to solve the problem.

When you say it barely changes speeds, does that mean it doesnt speed up, or doesnt slow down? By that I mean, is it "stuck" on low, or high?

Most blower fans run at different speeds through the use of a multi-stage resistor built into the fan switch circuit. Low speed is a high value resistor, medium speed is a low value one, and high speed is the fan running without any resistance.

If your fan is running on high and doesnt seem to want to run on lower speeds, the resistor pack may be failing. If the fan is running on low speed only, it may be that the fan itself is beginning to fail, or that the lubricant in it has gotten gummy.

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Heater / air conditioner fan control doesn't engage fan. Previously, it only worked in high speed.


I would replace the blower motor resistor first then see if that corrects this. The resistor is located next to the blower motor under the dash.

Jul 16, 2012 | Cars & Trucks

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My 2000 F 150 Air conditioner works for only a few hours then stops blowing air.


sounds like the evap core id freezing up are you leaving it on recuit position to long?

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1 Answer

Why does my 1997 mecedes benz e420 run hot when I turn on the air conditioner


Couple of reasons. You may need to have the Radiator backflushed to remove sediment. You also have an Electric cooling fan which may be malfunctioning. They (fans) often have more than 1 speed and high speed may be broken so it can not keep up with extreme heat.

Some fans use more than 1 relay to switch the fans and the second stage relay may be bad.

Overall, the A/C coil is placed in front of the Radiator and depends on airflow to function. This makes the air available to the Radiator much hotter so the Radiator is having a hard time cooling the engine. The Electric radiator fans kick up the airflow to help both systems out.

A dirty radiator, old antifreeze, etc. can affect performance.

I hope my solution is helpful. Radiator shops can service most Brands.

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have you tried replacing the thermostat?

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ok. so you know the fan is good. switch out the relay for that fan with another same relay and check with the a/c button.

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it is the resistor pack that runs the blower motor it is shorted to the hi position

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Possibly fan clutch or clogged radiator/condensor.
To check for fan clutch, hook up A/C gauges, turn a/c on watch high side gauge. 300 psi. and above run water on condensor, if psi. goes down to about 250 psi and holds. replace fan clutch.
If not, check radiator/condensor for dibris outside, and or corrosion inside the radiator.

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