Question about 1998 Pontiac Sunfire

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Car overheating my car overheats badly after about 10 min of driving.. i am aware of a coolant leak, have changed the housing. cant find a hose that it is leaking out of.. was told to put straight water in it to prevent blowing my engine. i have a replacement thermostat but noone knows where it is located.

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Follow top radiator hose to engine and thats where the thermostat is located under the housing at the end of the top hose at the engine.

Posted on Apr 18, 2009

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2001 Mazda MPV overheats. radiator hose doesnt feel pressurised ie very soft to squeeze. when i put coolant in after 5 mins of driving is backflows out of the reservoir and causes heavy smoking from t


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It may only be the temp sensor in the radiator that activates the fan. If that fan don't work, the engine will overheat. Heat forces water out upon expansion is why you see the leak in driveway. Check the temp sensor in the radiator before changing anything else my friend. That sensor won't cost that much. You can always remove the wires off the sensor an hook them together then take it for a drive with the fan always on. It won't overheat then unless you really do have a coolant leak, but still sounds to me like a bad temp sensor. Luck toya Bro.

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I have an 1997 chevy camro rs w a 134000 miles that is overheating the engine an water pump has been replaced an i stil cant find what is causing it to overheat


It could be the thermostat not opening and closing as it should. Or it could be a bad overflow/radiator cap. If the cap starts to go bad, it won't hold pressure and this will cause overheating. Good Luck. There are other major issues possible, but hopefully it's not. Start the engine cold and as the engine warms you should feel the thermostat open and water flowing as you hold the radiator hose, just be careful around moving fans.

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My 1997 Dodge Intrepid overheats. I've replaced the thermostat, and it continues to overheat. I noticed adjacent to one of the radiator hoses, a ribbed hose that is split. Could this cause the car to...


Now that you've eliminated the thermostat, it could be a number of other things. Don't drive the car too far until you've fixed the overheating problem - overheating can destroy an engine.

That split ribbed hose you see is plastic wire loom - it carries and protects electrical wires, and is not the cause of overheating.

1. Low coolant level
2. Radiator hose split/cracked, causing low coolant level.
3. Head Gasket - leaking, causing low coolant level
4. Thermostat - stuck closed (you eliminated this possibility)
5. Radiator cap - worn/damaged
6. Radiator fins - obstructed by debris/cardboard
7. Water Pump belt - missing/broken
8. Heater Core - leaking, causing low coolant level
9. Intake Manifold Gasket - leaking, worn, damaged
10. Radiator Fan Relay - faulty
11. Radiator Fan Blade - broken, missing
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My primary suspects would be Rad Fan Relay (#10), and
Rad Fan Switch (#12).

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Your thermostat is located where the upper radiator hose connects to the engine under a housing. If it is not leaking there then check the bottom of your water pump. Look at it from underneath and you will see a small weep hole in the water pump housing. If it is leaking there your seal or bearing packing has gone bad. Simple solution- replace the water pump. The other reasons for overheating could be a stuck thermostat which will cause the vehicle to overheat within about 5-10 minutes after starting. The other cause could be a radiator that needs to be roded and cored because of to many deposits internally causing restricted flow of the coolant.The thermostat could be cracked or rusted out also. Try to gain access to a system pressurizer to find your leak. I have given you just about every scenario to check to find your problem. Good luck.

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First, plastic tube may be the overflow vent from the coolant bottle.Check to see where the attached end goes. You are going to have to check engine for coolant leaks (carefully refill system without spilling anything, then look for dripping anywhere. Look for leaks from all hoses, fittings radiator, water pump etc) After checking for leaks, start it up and check again (watch where you put your hands though) While running, check that the fan comes on when the vehicle reaches operating temp.(no fan, check fan motor, sensor & relay) Turn the heat on (does it have heat?) Check temp of lower hose and upper hose. If overheat happens, is lower hose still cold? (likely bad thermostat). If you found a leak, replace whatever is leaking...best insurance is to change thermostat after any overheat. Last, is there any white smoke from tailpipe, does engine run rough? If so, could be a failed head gasket or crack in cylinder head. (at this point last thing to worry about unless there is excessive smoke or rough run or oil in radiator or coolant in oil).

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