Question about 1997 Chevrolet Lumina

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Changed entire cooling system and still overheats

Changed waterpump, radiator, thermostat, coolant, still overheats. car shuts off when you take off the oil filler cap.

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  • tim whitmire May 11, 2010

    do you have water in the oil?



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The overheat sounds like an air pocket in the cooling system there are two bleeder screws located on top of thermostate hosing and 1 on the metal pipe just above the water pump I believe they are 7mm. with the radiator cap off and the car running slowly open 1 bleeder at a time just crack it loose until you get a steady stream of coolant make sure to keep the level in the radiator up. be carefull coolant may be hot! when you take the oil cap off you are creating a big vacuum leak thru the PCV (positive crankcase ventalation) system this is normal for this car to surge or die.

Posted on Aug 02, 2009


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Did you change the thermostat? If not it may be the cause. You can check the thermostat by removing it and immersing it in hot water. If it is working it will open. The thermostat is usually located under the upper radiator hose.

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The engine overheats and shows hot but when the heater is on full blast the temperature corrects.What can it be and what is the fix?

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Why dose my car over heat

wow could be a lot of reasons depending on how long it takes to overheat.The following are some but more info needed so as to be precise in instruction and diagnosis.
1.Thermostat jammed shut(will heat very quickly and one hose will seem cold when radiator is hot).
2.Radiator blocked with rust etc inside from age or lack of good coolant inside.
3.The cooling fins all rotted away from radiator being old.
4.The fans not turning on when needed-either a sensor fault or fan dead.if it is a viscous type fan then it is not locking up when engine hot.
5.coolant leak and level low.
6.a blown head gasket. belt running waterpump pulley is worn,loose or fallen off from breaking.
8.low oil level and dirty
9.waterpump impellor inside is rusted away or damaged
10.engine timing is seriously out .
and quite a few more reasons.
Try running your heater on full and the fan on maximun when it heats.Does this help cool it?if so get your radiator and cooling system cleaned out and recheck.
If it is cold to the vents,check your coolant level safely when it is cool enough to do this.
I hope these checks help you,or get back with your further findings from these checks

Mar 30, 2011 | 1995 Lincoln Town Car

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The cabin heater has not been working for a couple of weeks (it used to blow some hot air but now no hot air) and now the car overheats at idle. Can you suggest a solution or a part to check?

first thing, change the thermostat. this should fix the overheating problem. Your hot coolant goes from the engine to the radiator core, then back to the engine. If your thermostat is stuck shut, you will overheat. try this first, and let me know, If you still have problems, We will get it fixed. hope this helps

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Jeep is running hot

The first thing, of course is to check your coolant level, and if coolant is required, to add it in the proper proportion with water that is recommended for your climate. Now remember, if you need to add a good bit of coolant, you probably have some sort of leak, and will need to determine where that is and stop it

If it overheats only when sitting it is likely to be an electric cooling fan motor or the thermo switch that turns the fan on and off that is not functioning. Sometimes the fix for this can be as simple as checking to see that the wires are properly connected for both.
If they are, then stand next to the car when you start it up and, after the car has warmed up, listen to see if the fan comes on. After awhile it should cycle on and off to help cool the car. Enough air passes through the radiator when you are on the highway that the fan is not needed, and so the car will not overheat then even if the fan or thermo switch is bad.
if it overheats all of the time, and your coolant is both full and the proper mixture, then you can look to a few other causes: a clogged radiator, a bad water pump, a bad thermostat, or in the worst of all worlds a blown head gasket or the like

let us take the waterpump first. It is a relatively simple propeller like device inside a housing and as it is turned by the belt if pumps the coolant. When it fails, typically what happens is the seal on the pump fails and coolant begins to escape past the bearings on the pump and out a drain hole built into most pump housings and you will see evidence of the failure in coolant pouring out below the pump area.

If that is not the case, let us look next to the thermostat. For the most part thermostats when they fail, fail in the open position--that is, they allow the coolant to circulate freely between the engine and the radiator without a mind toward whether the engine is operating at precisely the optimum temperature or not. So in most overheating situations, the only way a thermostat failure can be the culprit is if it failed in a partly or entirely closed position--thereby limiting or stopping the flow of coolant entirely. If it failed closed the car would overheat in just minutes. Partly open failures, not common but possible, would impede the flow and limit cooling capacity. You might see evidence of it on very warm days only, or climbing hills, or pulling trailers--that sort of thing. An easy way to determine if the thermostat is working properly is this: When you first start the car in the morning, sit for several minutes and watch the temperature guage carefully. It should slowly rise as the temperature in the coolant in the engine increases. Then at some point it should suddenly drop back a bit signalling that the coolant in the engine has reached operating temperature and the thermostat has opened to exchange the coolant with the cooler fluid still in the radiator. If is does, the thermostat is still functioning.

Now, assuming that the thermostat is working and the waterpump is working we need to look at the radiator. If you do not change your coolant often, the inside of the radiator can become coated with sludge from corrosion (the coolant has a corrosion inhibitor in it that goes bad with age). That sludge can serve as an insulator to limit the radiator's capacity to exchange heat. If that is the case here, you will need to use a radiator flush to dissolve the goop and then refill with the proper mix of coolant and water suitable to your climate area.

Have a nice day..

Aug 03, 2010 | 2001 Jeep Grand Cherokee

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