A failing heater control valve may not open or only open when the vehicle is at idle.
Vacuum operated heater control valve.
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It may be controlled either by vacuum pressure or electrical signal.
The vacuum valve is normally open and uses a pintle and diaphragm.
This way heat may still be provided even when it is defective.
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A vacuum valve does this with a pintle and diaphragm except this type is typically open.
The cable can be operated by manually moving a lever in the control panel.
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This is the most common valve on aftermarket heat and a c evaporator units that use vacuum operated controls.
The valve uses 5 8 heater hoses and 1 8 vacuum tube.
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It sits between the water pump heater hose and the heater core.
The heater control valve is found in front of the firewall of the vehicle.
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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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These newer valves have one large vacuum dia phragm that actuates a piston within the valve to channel coolant flow into the heater core.
If the heater valve malfunctions the heater can still produce hot air to the cabin.
This may cause the heater to stop working.
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A cable operated heater control valve utilizes a bowden cable to drive a flap inside the valve.
In a cable operated heater valve a bowden cable is used to move the flap inside the valve.
The valve is opened with vacuum it is normally closed.
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As you move the lever on your hvac control the cable moves the flap.