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.
Vacuum operated heater control valve.
The cable can be operated by manually moving a lever in the control panel.
It sits between the water pump heater hose and the heater core.
The vacuum valve is normally open and uses a pintle and diaphragm.
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As you move the lever on your hvac control the cable moves the flap.
In a cable operated heater valve a bowden cable is used to move the flap inside the valve.
A vacuum valve does this with a pintle and diaphragm except this type is typically open.
This way heat may still be provided even when it is defective.
These newer valves have one large vacuum dia phragm that actuates a piston within the valve to channel coolant flow into the heater core.
The valve uses 5 8 heater hoses and 1 8 vacuum tube.
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Online shopping for heater control valves heating from a great selection at automotive store.
Vacuum operated heater control valve to open and close the flow of water in the heater system.
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.
If the heater valve malfunctions the heater can still produce hot air to the cabin.
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A failing heater control valve may not open or only open when the vehicle is at idle.
This is the most common valve on aftermarket heat and a c evaporator units that use vacuum operated controls.
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.
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Heater valve compatible with toyota 4runner 99 02 tacoma 01 04 heater control valve cable operated 3 8 out of 5 stars 8.
Heater valve compatible with toyota 4runner 99 02 tacoma 01 04 heater control valve cable operated 8.
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A cable operated heater control valve utilizes a bowden cable to drive a flap inside the valve.
The heater control valve is found in front of the firewall of the vehicle.
This may cause the heater to stop working.
The valve is opened with vacuum it is normally closed.
4seasons everco four seasons heater control valve 74859.
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