Vacuum Operated Heater Control Valve

Many of the heater valves used from the 1970s to the 90s were made from corrosion resistant metal or abs plastic and were vacuum operated.

Vacuum operated heater control valve. Since a vacuum operated valve defaults to the fully open heat on position when vacuum isn t applied a loss of vacuum is the first thing to suspect in a heat always on condition. The heater control valve is found in front of the firewall of the vehicle. 4 seasons 1 4seasons everco 100 ac delco 5 dorman 6 uro 16 this is a test. A failing heater control valve may not open or only open when the vehicle is at idle.

In a cable operated heater valve a bowden cable is used to move the flap inside the valve. Online shopping for heater control valves heating from a great selection at automotive store. These newer valves have one large vacuum dia phragm that actuates a piston within the valve to channel coolant flow into the heater core. Vacuum operated heater control valve to open and close the flow of water in the heater system.

It sits between the water pump heater hose and the heater core. Heater valve compatible with toyota 4runner 99 02 tacoma 01 04 heater control valve cable operated 3 8 out of 5 stars 8. This may cause the heater to stop working. If the heater valve malfunctions the heater can still produce hot air to the cabin.

Four seasons 74627 heater valve 4 7 out of 5 stars 38. Heater valve repair kit compatible with mercedes benz cars set of heater. Diysave10 online ship to home orders only. A cable operated heater control valve utilizes a bowden cable to drive a flap inside the valve.

The vacuum valve is normally open and uses a pintle and diaphragm. As you move the lever on your hvac control the cable moves the flap. This way heat may still be provided even when it is defective. The cable can be operated by manually moving a lever in the control panel.

The valve is opened with vacuum it is normally closed. Four seasons 74866 heater valve 3 9 out of 5 stars 10. You have 0 items in your cart. View cart and checkout.

It may be controlled either by vacuum pressure or electrical signal. 1961 1966 ford thunderbird cable operated heater hot water control valve part 66 34827 1 1977 1979 ford thunderbird heater temperature control unit part 66 69798 1 19 99 ea. 4seasons everco four seasons heater control valve 74859. Heater valve compatible with toyota 4runner 99 02 tacoma 01 04 heater control valve cable operated 8.

Vacuum operated heater control valve a heater control valve can fail in several ways. A vacuum valve does this with a pintle and diaphragm except this type is typically open.