Always should replace thermostat at same time; if this was not done, do so. Rust and gunk in the cooling system from a corroded radiator will often jam and damage the thermostat. Conversley, sometimes a corrding thermostat sets of the entire process by both stricking and by sending hicks of rust to the other cooling system components (radiator and water pump). After engine idles for a while (but prior to overheating) gently squeeze the large hose attached to the top of the radiator. Is it getting warm? If not, the thermostat is likely not working. The thermostat should click and open the route for the top radiator hose, when the temp gauge is no farther toward "H" than at or just below the halfway mark, or just above, on most vehicles. Once the thermostat opens up the route for the upper radiator hose, the temp gauge should fall quickly. If the thermostat wasn't replaced, appears to not be functioning, and is easily accessible and visible, tap it with a hammer (not hard enough to damage it)and see if it becomes unstuck. If your vehicle has an electric fan, make sure it is coming on after a few moments. If it isn't, check that its fuse is OK, that the wire connections are solid, then check that the fan relay is not burned out. A heat sensor sending unit which controls activation of the electric fan could also have failed. In some 60's vintage vehicles, one could often stop overheating by replacing the stock 4-bladed fan with a 5-bladed fan. If you have an automatic transmission that is routed through your cooling system, and you've tried everything possible to correct overheating, your tranny may be on its way out. The problems your tranny may be having having operating normally could be effecting the engine temp. I agree with the changeing of the thermostat , Here is one more sug your radiator cap is not maintaining proper pressure get it pressure tested IF YOU DIDN'T CHANGE THE RADIATOR CAP WHEN DOING ALL THAT OTHER STUFF, GO AHEAD AND CHANGE IT. IF THE OLD ONE IS BAD IT WON'T HOLD THE PROPER PRESSURE AND THE COOLANT CAN BOIL= OVERHEATING! patricklaw1957@Yahoo.com Check the fan to see if it's running. If the engine heats up and the fan isn't going, the fan motor is shot. If you have tried everything else and you are still having overheating problems you might have a bad head gasket. I didn't see what type of vehicle you were working on. I had a 1988 Dodge Caravan. I replaced everything in the cooling system including putting an oversized radiator in. The problem turned out to be a bad head gasket. I never observed any oil in the radiator. If the thermostat was replaced and water pump and radiator as you say then there are only a couple things that it can COMMONLY be.It always seems to me that people like to take out the engine before replacing the spark plugs.Take theese words of advice(alot of people over analyze things)99 percent of the time it's the easy stuff!your problem is probably the radiator cap.If it is not holding the proper pressure it will overheat.cost is about 4.95. could be bad head gaskit
You have a blown head gasket.
Overheating can be due to several factors. You could have a bad water pump. Check for slight steaming from the water pump, sometimes unnoticable if it's just the seal. Also, it could be a bad thermostat, which if it stays stuck shut can cause overheating. Another factor that is not the radiator is the most costliest of the repairs. If the head gasket blows, what happens is that the car will continue to overheat even if you've replaced the radiator. The loss of compression in the engine causes the car to continuously overheat.
Low coolant? system "airbound"? Hoses collapsing under pressure clutch or cooling fan not working? Defective radiator cap?
clogged radiator, advanced timing, worn water pump, dragging brakes, etc. Usually, the thermostat isn't the real cause of overheating.
Maybe a faulty thermostat or a possible block in the radiator or cooling system. Also check the fan is working and the cap is maintaining pressure.Rad. CapsIt sounds like the pressure cap ( radiator cap ) isn't holding pressure and when the coolant heats up & expands it just flows into the reservoir. Also if the thermostat is plugged or faulty you will have similar problems IE. too much pressure and overheating. Your problem sounds like both at once.
Yes, too much flow through the radiator does not allow the water to cool properly (or enough) so it returns to the motor hotter than it should be, which in turn raises the temperature even more.
did you replace radiator hoses i have seen hoses collapse and cause overheating while driving and radiator could be clogged. also did you bleed your cooling system according to owners manual
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If the engine has been running and is hot, shutting off the ignition allows the water in the water jacket to continue to be heated. Therefore, until the engine cools down below boiling temperature, it will continue to heat the water. Boiling is prevented by a couple of things; anti-freeze (which raises the boiling temperature) and the radiator cap (because water boils at a higher temperature when under pressure). If your car is overheating, you should not remove the radiator cap (until the vehicle is cool), you can be severely burned as the pressure drops rapidly, boiling the liquid and forcing it out of the radiator!
Look for the obvious ie check wiring to temp sender and sender is ok, water leaks even at the back of the eng bay also heater radiator which is located inside the car, if all is ok check that thermostat is opening at correct temp (remove to check when eng is cold) if opening at correct temp the next thing is your eng block & radiator could be partially blocked if so then the radiator should be removed for specialist repair and clean block appropriately, and last but not least if all the above is ok then the problem lies internally ---- headgasket, cracked head even cracked block ---- good luck
Is the water pump in good shape? Check to see that it is full of water, Even if it was before, It may not be after the thermostat opened, Is the fan working? Is the engine in good shape, A bad timing chain or the ignition timing being off can cause excessive heat.
It might be your thermostat is stuck, radiator plugged, low coolant, leak, failed water pump, water pump fins have corroded away (happens when you don't change the coolant often or when you use water from a hose) or even something as simple as the radiator cap. Your best bet is check for an obvious leak first, in my experience I've found there bad about leaking from the lower thermostat housing. Pressure test cooling system and radiator cap. The water pump is a bit hard to diagnose but if you put a voltmeter lead one to ground and the other inside where the coolant is and if you see a reading above .5volts DC the coolant is too corrosive and should be flushed out and replaced. If your not to car savvy take it to your trusted local ASE certified master tech and let him diagnose and fix the overheating issue.
See "Related Questions" below for information on diagnosing overheating problems - and even how-to-replace a water pump instructions.
my 2001 ford windstar is still overheating even though i changed out the thermostat. what could it be?
This is not a definitve answer, but I have heard that overheating is a common problem on early model Cherokees. I had the same issue with my 93 Cherokee Sport (4.0L, 4WD). I first made sure my coolant/water ratio was good. That wasn't the problem, though, so next, I had the radiator flushed and cleaned. That only worked for a couple of months. After that, I had a new radiator installed and changed the thermostat from a 210 to a 190. That seems to have worked reasonably well, but I still get occassional overheating in the summer on long steep grades or even on flat stretches if the airflow across the radiator is disturbed even a little bit, like following an 18-wheeler on the highway or driving in stop-and-go traffic around town.
there could be many different factors in the problem could be that your cooling fan does not come on or your radiator is plugged or maybe your thermostat does not open or it could even be low on anti-freeze.
If it's overheating, then it might be several things like: low coolant level, improper coolant mixture, faulty fan on the radiator, or it's relay that controls the fan. Or maybe even the water pump is on it's way out.
Apparently you are having an overheating problem and you suspect the radiator cooling fan. First thing you want to check is if the thermostat is not stuck closed. Open the hood, remove the radiator cap and start the engine. When normal operating temperature is reached, carefully look into the radiator filler neck. You should be able to see water circulating. If the fan motor doesn't come on by that time, then it could be that the radiator fan sensor switch or the radiator fan motor are at fault (maybe even both). After the engine cools down, wire the fan motor direct to see if it will run, if it does, replace the sensor switch. If the fan motor doesn't run, replace the fan motor before you buy a new sensor. If after replacing the fan motor, the fan still doesn't run, then replace the sensor. You don't have to run the engine to an overheating point to see if the fan will run, it should come on when the engine reaches normal operating temperature.
If there is no overheating or loss of coolant, most likely it is due to condensation in the exhaust system (pretty normal in cool or rainy weather).
Overheating on any vehicle can be caused by many different problems. It could be as simple as a sticking thermostat or a worn water pump or even a build-up of deposits inside the radiator. Once water cooled engines have significantly overheated the heads will typically warp, causing even more problems. A warped head can allow combustion gasses into the cooling jacket of the engine, which will raise the pressure inside the cooling system and push coolant out of the engine resulting in... even more overheating. If that's the case, the only way to repair the problem is to have the head machined and replace the head gasket. If the overheating is caused by any of the other problems mentioned, just replace the offending part and the problem may go away. The Saturn S series engines were quite well designed and typically perform well, unless they are allowed to overheat.
If you have an old ISUZU Trooper, the radiator thermostat may be not working. Therefore, it will not let cool water from the radiator into the hot engine, even if the radiator is full. Have the thermostat checked and replaced, if necessary. Good Luck
It sounds like there's a leak somewhere. If it's not in the cap, it could be in the hose, or the connection, or the radiator itself. If you can't figure this out on your own, take it to a mechanic.
Could be an air lock, could be a stuck thermostat, in the closed position. Changing the thermostat is an inexpensive next step.
I have a 94 Toyota 4wd turck....I replace the radiator. it was plugged up. Water wont circulation. Fixed my problem
There might be a leak in the water pump, or in the radiator. Maybe even check the radiator hoses for cracks and leaks.