How do you reset a flow switch?
Turn the unit off and unplug it from the power source for 30 seconds. This resets the spa’s control panel and will make the switch work again. If this does not work, turn the unit off again before trying any other troubleshooting techniques.
Why do I need to replace my heater control valve?
During times when the air conditioner is in use, the heater control valve closes, preventing engine coolant from entering the heater core. The result is less heat in the passenger compartment, allowing the air conditioner to work more efficiently. Follow the step-by-step guide below for directions for replacing a faulty heater control valve.
How does an air conditioner control valve work?
During times when the air conditioner is in use, the heater control valve closes, preventing engine coolant from entering the heater core. The result is less heat in the passenger compartment, allowing the air conditioner to work more efficiently.
Where are the heater control valves located in a car?
Some heater control valves will be located in the engine compartment at or near the passenger side firewall. Others are located behind the dashboard near the passenger footwell.
Where does the coolant go when the heater is turned on?
When the heater or defroster is turned on, warm engine coolant passes through the heater core. Here a fan forces air across the surface of the heater core and then into the passenger compartment where the warm air is felt.
How to replace a heater motor switch or relay?
Step 1: Replace the switch. At this point you should have the switch in a position to easily disconnect it. Be careful, there are usually locking tabs on the connector that have to be squeezed before it will release and pull off. The plastic connectors are brittle and break easily.
When do you need to replace a heater control valve?
Never drive an overheating vehicle or an extended period of time. Typically, the mechanical heater control valve is replaced because it is leaking. The mechanical unit can leak coolant or the vacuum diaphragm can rupture causing a vacuum leak which will stop control valve operation.
How do you replace a fan switch on a heater?
Replacing the fan switch begins by removing the knob. Most of the time the knob just pulls off, but sometimes it’s a little more tricky. Carefully inspect the knob all around using your inspection mirror to look underneath.
What causes a heater control valve to stop working?
The mechanical unit can leak coolant or the vacuum diaphragm can rupture causing a vacuum leak which will stop control valve operation. The cooling system is pressurized so a coolant leak at the control valve can cause the coolant level to become very low and cause the engine to overheat.
