There is no radiator cap, it's the expansion tank cap. Make sure you have fluid in the expansion tank. As long as there is fluid in the tank, your radiator will be full and you should get heat. No heat with a full radiator means there is another problem such as the heat solenoid that allows fluid to flow in the heater core may be faulty or your blend door that mixes the hot air with cooler air to control temperature may be faulty.
SOURCE: 1991 overheating Towncar
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.
SOURCE: Expansion tank
Yes these can become distorted or malformed through repetitive overheating. They are made of rather thick plastic so it does make them resilient to warping but not impervious. I can not say that it can weaken the cap, but I can say that constant boil over can not be good for it.
SOURCE: low on coolant and can not get cap off of
Be sure that the engine is cold, you need tu push down the cap a little when turning it off.
SOURCE: i changed expansion tank on
Common problem - the heater matrix is difficult to bleed as it is high level. take of off one hose and gently flush through with a garden hose until bubbles disappear - this is safer than trying to bleed the system when the engine is hot
sounds like electric door motor is bad in front of the heater core. door is'nt opening
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