Global Parts 8221288 HVAC Heater Control Valve

HVAC Heater Control Valve for 1985 GM Trucks

Global Parts 8221288 is an HVAC heater control valve for vacuum-controlled heater systems. It is listed for 1985 Chevrolet S10, 1985 Chevrolet S10 Blazer, and 1985 GMC S15 applications, making it a direct-fit option for select GM compact truck heating systems.

• HVAC heater control valve for vacuum control applications
• Fits 1985 Chevrolet S10, N/A, Valve; Vac Control
• Fits 1985 Chevrolet S10 Blazer, N/A, Valve; Vac Control
• Fits 1985 GMC S15, N/A, Valve; Vac Control
• Global Parts part number 8221288 for catalog matching and replacement lookup
• This part cross-references Dorman 1571148 for the same application.

Product Details

Heater control valves regulate coolant flow through the heater circuit so the HVAC system can manage cabin heat output. On these 1985 Chevrolet S10, Chevrolet S10 Blazer, and GMC S15 models, the vacuum-controlled design is used to open or close coolant flow based on HVAC command signals. Global Parts 8221288 is a practical replacement when servicing a leaking, sticking, or non-responsive heater valve in the vehicle’s heating system.

Common Repair Uses

• Restores heater output when the valve is stuck closed
• Addresses coolant leakage at the heater control valve
• Helps correct inconsistent cabin heat on vacuum-operated HVAC systems
• Replaces a worn valve that no longer responds to vacuum control

Installation Notes

Verify the vehicle’s HVAC layout and vacuum-controlled valve style before installation. Match the original routing of coolant hoses and vacuum connections to the removed part, and confirm the replacement is correct for 1985 Chevrolet S10, Chevrolet S10 Blazer, or GMC S15 applications. Inspect adjacent heater hoses and fittings for wear while the system is open.

Quality Assurance

Global Parts 8221288 is cataloged as an HVAC heater control valve for the listed GM applications and is supported by interchange references for parts lookup and replacement matching.