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Auto Systems and Repair

AC/Heater Control Module

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 Wear or Failure

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

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.

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