AC/Heater Control Module

By Andy Y, July 27, 2009

An AC/heater control module is a computer that controls and automates the operation of the heating, ventilation, and air conditioning systems (HVAC).

Symptoms of a Bad or Failing AC/Heater Control Module

  • HVAC system might not heat or cool properly
  • Air distribution from the HVAC may be incorrect

AC/Heater Control Module Related Repair Advice

  • Fault codes stored in the HVAC control module should be reviewed as part of any HVAC system diagnosis
  • As with most computer controlled systems in modern vehicles, the climate control system may need occasional software updates to address various issues. A quality shop will check with the manufacturer to see if there are any Technical Service Bulletins (TSBs) related to the problems you're having and will upgrade the software when possible.

1 User Comment

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By , July 12, 2018
2004 gmc , a/c blows hot air out of drivers vent cool air on passenger, can a shop program control unit or is it only to be replaced

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