I have fixed the thermostat, replaced the head gasket, and had the radiator redone. the temp gets to about 240-260 and pushs the water out the coolant resevoir. does this after about ten minutes or so. the coolant resevoir cap is busted
Did you check the head for when you had it off, This needs to be magna fluxed at a machine shop to check for heat .If the head gasket was replaced properly and torqued in the right increments and you replaced the thermostat and had the radiator redone this is about all it can be ,You can do a compression test to verify.
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OK sounds like head gasket or vapor lock hope its vapor lock need to bleed off all air in system turn on heat while radiator cap is off feel top hose make sure both hoses are warm with everything changed is fans even coming on an if not turn on ac an see if fans come on or not
Is the motor getting hot like boiling over etc or is it just the gauge or light..if not may be a bad gauge or light .if it is it may be your intake or head gaskets,, have someone do a cooling system leakage test..normaly called a radiator test..puts compressed air in in tne radiator that in turn puts more pressure inside the engine and heads it will find a leak due to leaking gaskets...good luck..
Look for the coolant temp sensor either mounted in one of the radiator tanks or near the thermostat housing. check the connections for corrosion. if still problem replace the sensor. also make sure your coolant level is correct.
The back window defroster turns off, when it gets to hot (about an hour or so). Unless there is an electric windshield heater, all there is, is the warm air for the front heater. If the car is run on low rpm or mostly downhill, there will be not much warm air being produced since the engine does not warm up.
Another possibility is, that the thermostat for the circulation of the radiator cooling fluid does not open, either because the engine is cold or, in case the engine is warm (if the stopped engine, right after driving the car for 5 minutes, can be touched without getting burned, the engine is not getting warm), the thermostat is not working properly, or the car is low on radiator coolant liquid.
The engine is leaking cooant some where and it is a big leak.
Could be from a cracked radiator or heating hose, or a leaky radiator, or radiator cap or into the oil sump, this will cause the oil to change to a milky color. It could also leak coolant into the combustion chamber pass a faulty head gasket.
Fill the radiator and put the car in park and run the engine until it reaches running tempurature, open the bonnet and look around the engine and under the car to see where the coolant is leaking. Also have a look at the exhaust tail pipe and the oil dip stick for color changes to the oil.
Even when the key is off with the engine cool after a few minutes? Or just a few minutes after it is turned off with the key?
Check or change your thermostat and flush the radiator with the heater running on hot as it can be. Can you see inside the radiator? If you can is the water flowing good? If it is not after you change you thermostat and it still runs hot then it is your water pump. Is it running hot?