Question about 1991 Lincoln Town Car

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1991 overheating Towncar

Me again. Overheating 1991 Town Car. Trying to check fan clutch. Does have resistance, moves about 1/2 turn when pushed by hand, but jiggled the fan itself and it does have a small wobble. Anyone think I need the heater core flushed? Car gets hot quickly and boils and steams out the expansion overflow. ALSO, I DON'T UNDERSTAND WHY THE EXPANSION TANK (WHICH HAS A 'RADIATOR PRESSURE CAP' ON IT WHEN IT ALSO HAS AN OUTLET HOSE (FOR OVERLFOW??) THAT IS JUST OPEN TO AIR. What's the point of a pressure cap when there is an opening in the expansion tank anyway? Help!?

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  • Lincoln Master
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Your pressure cap is used to maintain pressure in cooling system.over flow outlet is to let pressure off radiator when engine overheating.if clutch fan have resistance.its good long as the silicone oil isnt leaking from it.replace your thermostat.

Posted on Jun 04, 2009

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  • Master
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If car heats up quickly and overheats , the problem is the thermostat. The thermostat stays closed and traps coolant in the engine untill it reaches about 185 degrees , than the thermostat opens and allows coolant to flow to the radiator where it is cooled by airflow. ( airflow while driving is usually sufficient ) while idling , or in slow trafic , the fan keeps air moving through the rad. The heater core is strictly for heat in the winter inside the car. The thermostat is the most likely cause of the problem , and even if it was good before , the overheat / boil situation likely cooked it anyways. I am assuming the water pump is still getting turned by a belt. No water circulation by pump would cause same symptom as bad thermostat. Overflow and expansion bottles are designed several different ways on different cars , but the theory is that as the engine heats up and the coolant expands , it goes to the tank. Later , as engine cools down after being shut off , coolant contracts. Radiator is replenished by coolant returning from expansion bottle.

Posted on Jun 04, 2009

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