1999 GMC Suburban problem

1999 GMC SUBURBAN
266,000 MILES • V8 • 2WD • AUTOMATIC
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98BIGDADDY
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  • 2 POSTS
The A/C compressor turns on it works because the A/C for the back passengers blow cold air. My Issue is that the A/C does not blow cold air in front just vent and hot air. Any suggustions on the problem Thanks
Jul 11, 2009 at 9:56 AM
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BMRFIXIT
  • ✓ASE Certified Mechanic
  • 19,053 POSTS
  • ASE Certified Mechanic
I would suspect blend door actuator Temperature door is controlled by an electric actuator, based on temperature knob position. When temperature knob is in cold (Blue) position, air delivered by system is unheated. When temperature knob is in hot (Red) position, all air passing through heater module is heated before it is discharged. Intermediate position of temperature knob results in a mixture of heated and unheated air to provide moderate air temperatures. Disconnect negative battery cable. Actuator is located on left side of A/C-heater assembly. See Fig below. Disconnect actuator electrical connectors. Remove adjuster links from control lever. Remove screws and remove actuator. To install, reverse removal procedure. good luck


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Jul 11, 2009 at 10:10 AM
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