if the heater coil isn't plugged why won't water circulate through it?

Asked by Nov 30, 2013 at 04:16 PM about the 2002 Mercury Sable GS

Question type: Maintenance & Repair

I have flushed my heater coil both ways and got clear water through it, installed a new
thermostat and still don't have flow. The top hose is hot bottom is cold going to the heater coil.

2 Answers


Did you get all air out of the cooling system after replacing the thermostat? If not it could be air locked.

2 of 2 people found this helpful.

Do you have a heater control valve? This device shuts off coolant flow through the heater core when you're using the air-conditioning. Kind of like shutting off a faucet. It may be stuck closed and preventing the coolant from flowing through the heater core. HTH. -Jim

1 of 1 people found this helpful.

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