2004 Ford Explorer When turning the temperature knob from cold to hot it start making a clicking noise. the fan works but only cold air comes out

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Hello auntdae.... when the fan works and cold air comes out begin by checking the thermostat. Chances are that the thermostat is stuck and not allowing any hot water from the engine to heat the interior of the vehicle.

The good news is this is an inexpensive fix, the part is usually in the $5.00 range. If you are somewhat handy, you can change it yourself. It requires removing two bolts, scraping off the old gasket and then installing a new gasket and thermostat. Joe