Take control of cabin heat with the Four Seasons HVAC Heater Control Valve 74612, a vacuum-controlled valve that manages the flow of engine coolant into the heater core so your HVAC system can regulate interior temperature. It's an application-specific replacement that fits a long list of classic applications — including the 1974 American Motors Ambassador, 1976-1984 Buick Century, 1980-1984 Cadillac DeVille and 1975-1986 Chevrolet C10 — with many more shown on the Buyer's Guide tab.
This is a front-position, non-bypass valve: vacuum actuation closes the valve to control coolant delivery to the heater core (per its "Vacuum Closes Non-Bypass" design).
Vacuum controlled operation for the listed applications.
Temperature tested to 270 degrees F.
Pressure tested to help ensure a leak-free design.
Application-specific design; plastic construction with 2 connectors.
Backed by Four Seasons' mobile A/C experience. If a stuck or leaking heater control valve is the cause of your no-heat complaint or coolant seepage, this valve replaces it — diagnose the cause before ordering. Manufacturer part number 74612.
Frequently Asked Questions
What does the 74612 heater control valve do?
It regulates the flow of engine coolant into the heater core, which lets the HVAC system control cabin temperature. This unit is vacuum controlled and closes under vacuum.
Is this a bypass or non-bypass valve?
It is a non-bypass, vacuum-closed heater valve with 2 connectors, per its catalog specifications.
What is the valve made of?
The catalog lists plastic construction with 2 connectors. It is temperature tested to 270 degrees F and pressure tested to help ensure a leak-free design.
Will this fit my vehicle?
It fits hundreds of listed applications, including the 1974 American Motors Ambassador, 1976-1984 Buick Century and 1975-1986 Chevrolet C10. Check the Buyer's Guide tab for the full list.
What are signs the heater control valve may need replacing?
Possible signs include little or no cabin heat, inability to control cabin temperature, or coolant seepage at the valve. Diagnose the cause before replacing, as other parts can produce these symptoms.
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WARNING:
These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov.
