Question about 1998 Pontiac Trans

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Motor continues to overheat and keeps stalling

The temperature gauge keeps overheating and feels like going to stall. Has fully shut down on its own a couple of times.

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Here are a couple of suggestions for the overheating problem.
1. Check your coolant level. I'd recommend adding a 50/50 mixture of antifreeze and water until it gets back to the proper level. If the coolant is low you probably have a leak somewhere. Look for the leak while the engine is hot. It might be something easy to fix like replacing a hose.
2. Check to see if your electric cooling fans are working properly. Let the car idle until the engine gets hot. Watch to see if the dual fans ever kick in. If the fans never turn on then the problem could be the fans themselves, the fan relay, a fuse, or a temperature sensor.
3. Your thermostat may be stuck closed.

Here are a couple of suggestions for the stalling problem.
1. Do a tune up, including plugs, spark plug wires, distributor cap and rotor, and possible the ignition module.
2. Check for a vacuum leak.
3. Add some fuel injector cleaner to your gas.
4. Replace the fuel filter and the air filter.
5. Make sure you have a proper oil level.
6. If the check engine light is on go to an auto parts store and have them pull your codes. This could indicate where your problem is.

Posted on May 22, 2009

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May have air in lines
if the cooling system is a closed one than you need to perge the system to get all the air out

Posted on May 22, 2009

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When idling my jeep overheats. The cooling fan is running and it speeds up when temperature goes up. The temperature gets close to 260 degrees and the engine tries to stall. when I start moving it cools...


At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.

Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.

If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?

It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.

Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.

Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..

The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.

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that is overheat shutdown in that cars computer. the easy way to fix this type of problem is to start cheap and replace the cars thermostat and put new coolant in it. if the overheating continues your water pump is the next to fix.

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Overheating and stalling


Check the fuse and relay for the cooling fan before it overheats again so you don't blow the head gasket on the motor. After you replace the fuse/relay let it idle keeping an eye on the temperature gauge, make sure as it reaches a little over half way the cooling fan should come on. If it does'nt then your coolant temp sensor may be at fault. Good luck and be safe.

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After 20 miles or so the car overheats and shuts off but once it cools down its fine again


The ignition module in located in the distributor under the cap. Might contribute to the stalling ,control spark to spark plugs, timming advance etc, but has no bearing on overheating. Hope this helps.

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