Take back control of your cabin heat with the Four Seasons HVAC Heater Control Valve 74805, a vacuum-actuated valve that regulates the flow of engine coolant to the heater core. It fits as a direct-fit replacement for the 1987-1995 Chevrolet Camaro, 1987-1992 Pontiac Firebird, 1989-1996 Chevrolet Caprice, 1990-1992 Cadillac Brougham, 1990-1991 Pontiac Bonneville, 1991-1992 and 1994-1996 Buick Commercial Chassis, 1991-1992 and 1994-1996 Buick Roadmaster, 1991-1994 Chevrolet Commercial Chassis, and 1992 Cadillac Commercial Chassis (all engines).
- Vacuum-open operation: vacuum-controlled valve opens to let coolant reach the heater core.
- Non-bypass style: non-bypass design with three connectors.
- Plastic body: pressure tested for a leak-free design and temperature tested to 270°F.
- Application-specific design: shaped for the listed GM applications, backed by Four Seasons' mobile A/C experience.
As a heater control valve, it meters hot coolant into the heater core so the HVAC system can supply heat. Signs this part may need replacing include a cabin that stays cold, heat that won't shut off, or coolant seepage at the valve. If a failed heater control valve is the cause of those symptoms, this replaces it; diagnose the cause before ordering.
Interchange: none listed. Manufacturer part number 74805.
