- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
If you have a viscous fan hub then replace it . Have a compression test done to determine if head gasket or cracked head. Check the thermostat operation by starting cold and hold the top radiator hose and time how long it takes until you feel the hose get hot ( 5-10 minutes at idle ). Flushing a radiator is a futile exercise because if the cores are blocked they will not flush out . A flow test is the best indication and if the radiator is over 5 years old then consider a new one as the cooling fins may be flaking off
heres a couple of cheap ideas
If after changing coolant or any time you have worked on the system, you must bleed all air out of the cooling system. Trapped air can cause an air pocket which will cause a hot spot and overheating. Some cars have bleeder screws and some don't. Check your owner's manual. If there is no bleeder valves and you suspect trapped air, park the caruphill or jack up the front, start the engine with the radiator cap removed and run until it reaches operating temp.
Common cause for this is too much water, not enough antifreeze. Evaporation is called "boil over". Adding antifreeze to water increases its boiling point. Since water boils at 212 degrees, and (my car) optimal operating temperature is 190 degrees - there is a thin line from running normal to "boiling over". Solution - the mix in the radiator should be 50% antifreeze and 50% water. To get the correct ratio antifreeze to water, buy a coolant test kit or buy your coolant in pre-mixed bottle.
also,, are you sure the fans are operating correctly !!
Have you checked out the water pump? Most of the time, you can feel movement in the /head shaft area before it fails. Water pumps usually go slowly, pumping less and less water (making the engine run hotter). The also get noisy when they start to fail.
Well if its getting hot and boils change the thermostat.once it overheats the thermostat is different and its character is altered. is there coolant leaks that will need to be addressed. look at the radiator cap and inspect it are the seal worn Youll need to replace it if it is , now how does the coolant look like is it rusted in there.that will need to be flushed. now if you are driving it does the cooling fan come on.do you want to check to see if it comes on with the car running turn the a/c on does the fan come on if it doesnt then you need to find out what happened to it. here is what causes a car to over heat : coolant leaks,radiator plugged,thermostat,non operating cooling fan, radiator cap that cannot seal the system properly .
It could be the fan temp. switch but it shouldn't have been boiling in the overflow tank. I'd recommend doing a compression test to see if you have a blown head gasket. If it's a blown head gasket, the compressed air/fuel mix being force into the cooling system could well look like boiling in the over flow tank.
Ok well there are two issues here the boiling and the potential for the transmission to be harmed by the contamination of the tranny fluid by antifreeze. First A/T fluid is not going to harm the coolant system in the least, however antifreeze in the trans. fluid will harm the automatic transmission get the tranny flushed as soon as possible , Change out the thermostat then refill radiator using 50% water 50 % antifreeze ( premixed in container) fill radiator then run the car without radiator cap add coolant as needed, put you radiator cap on and wait 5 - 10 minutes until car comes up to operatimg temp. you must observe the engine to make sure the electric radiator fan comes on after the car runs for at least ten minutes if it does not the problem is the usually the radiator fan relay or the fan coolant temperature sensor last in rare cases the fan itself. As for the air bleed usually letting the car run with the radiator cap off for ten to fifteen minutes will do it just make sure you don't remove the radiator cap when the car is hot 2nd degree burns usually hurt.
I would start by checking the temp. sensor should be near the upper radiator hose where it comes out of the engine block,after that you should have a fan relay on a fuse panel possibly under the hood or dash on driver side.