Question about 2000 GMC Safari

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The heater fan only works on the 3rd fan setting, and only blows a little air. The A/C only works minimally when set on defrost and the 3rd fan speed setting. I was told I need a new control switch, but don't know what to order. We already tried to replace the relay and resistor, didn't help. What part do I need?

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There is also a resistor board ( the one that controls the blower motor speeds) inline with the blower motor and the dash control. Was located internal to the blower housing on my 2002 Safari 4.3l.
The blower housing will have 2 wires exiting, with connector (red, black) and plugged into another cable, which is from the blower resistor board (mine was actually mounted into the housing with the A/C and heater core). You can test the connector from the resistor board with a multi-meter set to DCV at least 20 volts. Ignition on, engine off, fan on high. You should read about 12 volts. I you don't read any voltage, the board may be bad.

Posted on Jan 25, 2018

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  • GMC Master
  • 1,001 Answers

You need the service and repair manual in which you will find the part number and also how to fix the part with diagram you can get the manual from the given link http://toolsnyou.com/

Posted on Dec 11, 2017

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Posted on Jan 02, 2017

leetamara
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SOURCE: Fan speed switch only works on #5

Call your local GMC Dealer and see if they have the climate control panel in stock. What happens is the circuit board on the back of the panel shorts out. The panel comes as an assembly and is very easy to replace. Don't go with a wrecking yard piece. I made that mistake once and it didn't work either. I got one from the Chevy dealer and it worked perfectly.

Posted on Aug 21, 2008

  • 1 Answer

SOURCE: air conditioner not working properly

I have just ordered the part to fix this. It is the A/C vacuum actuator (not sure why they call it a vacuum actuator because it is an electric actuator). It is under the dash on the driver's side close to the radio. There are two in the same area. It is the one closest to the floor. You can verify by taking it out (pull out duct that runs from center of vehicle to the outside to get better access), and actuating the vent by hand with the blower on to see if you now get air out the middle vents.

The part number is 1573596 from Rock Auto on the net. It cost $40.79.

Posted on Jun 07, 2009

  • 172 Answers

SOURCE: 2005 GMC Sierra 1500 - heater blows, but only cold air

Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Posted on Jan 07, 2010

Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."

timsauto123
  • 760 Answers

SOURCE: 1998 jimmy....climate control system not

check the blender acuator,sound like it's not moving back and forth.under the dash.











TIM......

Posted on Oct 23, 2010

johnjohn2
  • 5763 Answers

SOURCE: 1995 GMC Yukon has issues

the fan setting sounds like a bad blower resistor or high speed relay but i would say the resistor, the air problem may be related to the controls or vacuum leak. check the engine area around the intake and make sure the vacuum lines are good and there are no leaks as this heater system is vacuum controlled, depending because some are actuator controlled also listen under the dash for a hissing noise as that would be a vacuum leak, another thing is to remove the control and check for vac leaks at controller.

Posted on Feb 05, 2011

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