Why does my car heater keep leaking coolant?
A coolant leak could indicate a cracked hose or loose clamp, or could stem from a more serious problem like a head gasket leak. Either way, don’t wait long to get it fixed — losing coolant is an easy way to overheat and destroy your engine.
What happens when your Mercury Grand Marquis heater stops working?
At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your Grand Marquis, this process has failed in one way or another.
What should coolant temp be when engine is hot?
With a good OBD2 code reader, you can also check the live data and the parameters of the CTS sensor. Check that the temperature value of the CTS is around 80-90c when the engine is hot. A lot of engine coolant temperature sensors have two wires and the sensor is controlled by Ohm.
What to do if your car heater is not working?
Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. Start the engine with cap still open and let the engine idle for a few minutes. If the coolant level should drop as the thermostat opens, top it up as necessary.
What causes coolant to leak out of a heater?
Over time the heater control valve can wear out and crack, which will cause coolant to leak from the valve. Heater control valves can also leak from excessive corrosion from contact with old or contaminated engine coolant.
Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. Start the engine with cap still open and let the engine idle for a few minutes. If the coolant level should drop as the thermostat opens, top it up as necessary.
What to do if your a / C unit is blowing hot air?
Check under the dash for disconnected, damaged, dry rotted, vacuum hoses as well as under the hood. If you are lucky, you will hear a hissing sound from the leak with the engine running. Let me know what you find.
What causes a heater control valve to leak?
Heater control valves can also leak from excessive corrosion from contact with old or contaminated engine coolant. Usually a leaking control valve will have to be replaced in order to repair the leak.