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Faulty thermostat.
a faulty thermostat control
Sealant does not work. Replace faulty seal or gasket.
Depending on the make and model of your car, the aircon control unit or the thermostat may be faulty.
either your temperature contol switch is faulty or the heater thermostat is faulty you can also check the blend air door switch it might not be switching from heat to cold air http://wiki.answers.com/Q/My_1995_town_car_air_conditioner_is_blowing_hot_air_but_is_full_of_freon_and_the_compressor_is_engaging_any_suggestions
A faulty fuel pump would cause your Navigator to hesitate when you accelerate. Bad gasoline could also be at fault.
Try changing your thermostat. It may be faulty.
can a faluty thermostat affect your central ac working?
IF YOUR CAR IS HEATING UP(OVERHEATING) AND YOU STILL DRIVING IT, A FAULTY THERMOSTAT IS THE LEAST OF YOUR PROBLEM.
A faulty thermostat in a 2001 BMW 325CI can cause a coolant leak. The coolant may be leaking out a crack in the thermostat or through a warped edge. In some cases the problem may be just a bad gasket and not actually a problem with the thermostat at all.
Resistance power of 20 amps indicate whether it is good or faulty.
Blown fuseA short in the cruise control circuit,Faulty brake or clutch switch,Leaking vacuum circuit,Faulty cruise switch,faulty stepper motor,faulty transducer,faulty speed sensor,faulty cruise control module.That help a little?