Question about 2001 GMC Sierra 2500HD
One or more heater & A/C (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.
Posted on Mar 14, 2011
Sounds like it could be the high speed relay for the blower motor. Try tapping on it when it's acting up. If it helps at all, you may want to change the relay.
Posted on Mar 13, 2011
Hi, there are several reasons your vehicle may be blowing hot air through the vents, such as a need to recharge refrigerant. There could also be a problem with the air conditioner's compressor. Vents will blow hot air if the compressor does not activate when the A/C is turned on.
Compressor To find out if the air conditioner's compressor is causing hot air to come from your vents, you can test it by connecting its clutch wire to a battery. If the compressor fails to turn, it is likely that you will need to have it replaced.
Refrigerant If your air conditioner is low on refrigerant, it can be recharged to combat this issue. However, checking for leaks should always be done before taking this action. Also, your air conditioning system's vacuum should have all air removed from it prior to recharging refrigerant.
Posted on Mar 13, 2011
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Posted on Jan 02, 2017
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