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Restoration - GM Heaters


What does a heater do?

The heater coil is the source of heat that ultimately comes out through the car’s dash louvers. The heater coil acts like the evaporator, only using hot water from your engine to generate a hot coil. The heater coil is located in an enclosure called a heater box or plenum (heater-evaporator box). When the heater is turned on, the air that is forced through the heater coil is ultimately pushed through various ducts and louvers before entering the passenger compartment.

Why restore or replace your heater coil?

Over time, many things can decrease the efficiency of your car’s heater coil or cause it to leak. The main failure of a heater coil is leaking, but contaminants from the car’s cooling system often block internal passages that prevent the coil from generating enough heat for the car’s passenger compartment.

Buy a new Heater Coil or let us restore


While we do have some of the most common heater coils, many are no longer available. In most cases, Classic Auto Air can re-core your original or we may have a NOS coil available. Please call or Message Us for more information.

Beat-up Heater Box?

We don’t offer replacement heater boxes, but we can restore yours.

Heater box restoration services include:

  • Disassemble, inspect, clean and replace damaged or missing parts
  • Clean & repair fiberglass housing
  • Recondition or replace heater coil
  • Replace all foam seals

Heater Valve issue?

Click here for information on heater valves.