My wife's 2002 Taurus heater will not get hot. I replaced the thermostat, but it only gets warm. While driving the temp needles goes up and down. For some reason, thermostats do not last long in this car; this is, at least, the 3rd one I've put in in the past 5 years.
If you live where it is really, really cold, you may need to block off part of the radiator to get the car to warm up.
Not that cold 20's - 30's and the car is kept in a garage.
Also, the AC works fine in the summer
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