Car started running hot all of a sudden. We have changed the thermostat, water pump, head and head gaskets, radiator and fan. I am stumped. It still runs hot after driving 15 miles or so. Any help would be greatly appreciated.
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Re: 1997 ford aspire running hot.
Did you check to make sure that the gauge isn't bad? or the sending unit? also are the electric fan running when the engine reaches temp? i will be able to pinpoint the problem with the answer to these ?
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check that you put the thermostat in the right way. Body into the water and not the hose. Check that the fan circuit is operational with the fuses and relays operating normally. If it is an auto check the temperature of the transmission oil as it is cooled by the radiator and that will make the car run hot if the oil is over heating from a transmission fault.
It could be a leaking head gasket, or blockage in the cooling system such as sludge in the radiator, or a faulty cooling fan. How long can you drive it before it gets to 220 degrees, and is the fan coming on ?
Thermostat is clogging, water pump failure, air in cooling system, a leak in the hose. These are the obvious issues concerning overheating. Hopefully its not a blown head gasket. There is a 30 dollar diagnostic you can have run and the mechanic will tell you if its a blown head gasket. I should know. I have a bmw and i didnt get diagnostic and bam head gasket was way warped. Cost me 2200 for head gasket repair. This is what I recommend you do. Also you could run vehicle without thermostat and see what happens. if it dont over heat then it was thermostat.
Engine over heating can be caused by a number of things. When you say the water pump and radiator appear to be ok I am also guessing that you checked the coolant level to make sure it is normal.
If the level is low then you obviously have a leak. Insufficient coolant circulating will not cool the motor properly because it won't be able to draw enough heat out. If the level is normal then you need to check the thermostat to make sure it is opening properly. To do this, run the motor to temperature and check the top and bottom hoses. They should both be hot and firrm once the thermostat opens meaning the circulation loop is operating properly. If the top is hot and firm and the bottom is cold/soft or collapsed then the thermostat isn't opening.
If the thermostat is operating properly then you ned to look for some other obstruction or cause for coolant loss. Check the head/intake gaskets, hose connections, hoses, over flow tank, radiator fins, radiator side tanks etc..
Sounds like a typicul sable cracked cylinder head. usually the head nearest the firewall. If youdo a head gasket job, be sure to have the heads presure tested and milled. Try starting the car with the radiator cap off and full. Water will spurt out right away if the head is cracked
I would start your car when it is cold and feel the upper radiator hose. When the car starts to warm up the thermostat you have installed will open up and you will feel the water flow past where you are squeezing the hose and the hose will become very hot. This will tell you if you thermostat is opening and installed correctly and if you water pump is working.
If your radiator cap is not working properly the system isn't sealed and this can cause the coolant to boil over and your car to overheat. Might want to repalce that they are cheap.
I would also pull the radiator cap while the car is running and look at the coolant, does it appear to be flowing smoothly thru the radiator. Have a helper rev up the motor while you look at the coolant in the radiator. When they rev it up do you see a lot of cavitation in the radiator (bubbles). If so this is an indication of a leaking head gasket. Observe the tail pipe for white smoke to aid in this diagnosis. Just because neither of this two conditions are present doesnt mean you don't have a leaking head gasket, I would also get a head gasket combustion kit from NAPA it will tell you if there is comnbustion in the coolant.
Finanally are all of your cooling fans working properly?
Make sure you put in the correct temp thermostat. GM usually has 2. A low temp and a high temp. Most shops will give ya the high temp just because thats usually what the book calls for. you might want to try a low temp. Also, sometimes, when a car runs hot and everything has been repaired....well, almost everything......it might be the head gaskets. And those my friend are no easy task. But..somewhere to start. have your cooling system pressure tested. Only way to really know for sure. Oh..also make sure your fan is working!!!! You might have a faulty fan switch.