Q: Heater doesn't work on 2002 Mercury Cougar

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The heat in my car has stopped working over the last couple of winters. Last winter it took about 30 mins to warm up but this winter it wouldn't ever get warm at all. The AC works okay... not super well but at least it blows cool air.
(1) Answer
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Where does the temperature gauge read? If it reads on the low side of the gauge after 10 or 15 minutes driving I would suspect a bad cooling system thermostat. Check with the engine running /warmed up the hoses going into the heater core, both should be hot if the heater controls are on full hot, if only one is hot check the heater controls are operating the heater valve and or try flushing out the heater core with the hoses disconnected see if the heater core is restricted with debris.
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