1991 overheating Towncar
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.
Jun 04, 2009 |
1991 Lincoln Town Car