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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Posted on Jan 02, 2017

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3 Answers

Over heating problem , Toyota coaster year 2008. Change radiator, fan,and it still overheat. The head is ok.


Did you replace thermstat? I would start with that. If still trouble have a block check performed

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Car overheats and there is air in cooling systems.


It can be faulty thermostat or worn out waterpump.Or it can be issue with no coolant or blowd head gasket or head itself needs replacement.
To confirm the issue.Click the link below and follow step by step test procedure:----
http://www.gresk.com/2013/09/2005-chrysler-300-overheats.html
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Thanks.

Sep 29, 2013 | 2005 Chrysler 300

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Overheat after waterpump replacement


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.

Jul 27, 2012 | 2002 Audi TT

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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? maddock@hotmail.com


by turning on the heater the blower motor is actually helping cool circulating coolant which returns to radiator. your problem is , low coolant, radiator cooling fans not working, bad waterpump, or thermostat. make sure the radiator and reservoir tanks are full.

Apr 03, 2011 | 1996 Ford Explorer

1 Answer

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.
7.fan 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

2 Answers

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

Jan 11, 2011 | 2002 Pontiac Montana

1 Answer

Jeep is running hot


Hi,
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

2 Answers

1990 SUBARU OVERHEATS WHILE DRIVING


1990 Subaru overheating condition.

The entire cooling system needs to be checked.

1. If the coolant level is fine - and low coolant level in your cooling system is not the problem - you need to investigate further.(see 2 below)

If the coolant level is low it needs to be topped up with the correct spec coolant and then the cooling system checked for leaks which could be faulty/worn hoses and/or a leaking radiator. If the car continues to overheat after running with the correct coolant level refer to 2 below.

2. If your coolant level is fine the entire cooling system needs to be flushed out and replaced with new coolant of the correct spec. ( If this has not been done for a couple of years it should be routinely carried out in any event every 2 years regardless of any problems).

Whilst this is being carried out the thermostat needs to be removed and checked. If it has not been recently replaced, a new one of the correct spec should be fitted. It is possible that the overheating is being caused by a sticking thermostat which is impeding coolant flow between the engine and the radiator once the engine warms up.

At the same time the water pump should be removed and inspected. If the pump has never been replaced or has not been replaced for many years it is on it's last legs. A faulty/corroded water pump will be unable to flow sufficient coolant through the engines cooling system from/to the radiator and the engine will overheat.

Any old or tired looking rubber hoses (radiator and heater hoses) should be replaced while this work is being carried out.

When the servicing is completed and the new coolant added, the system will need to be bled of air. If this is not done air in the system will impede coolant flow and the engine will overheat. The entire system should then be checked for leaks.

Do not operate your vehicle whilst you have this overheating problem except to get it to the nearest reputable auto service center. You can do very expensive damage to the engine if running it overheated .

Dec 06, 2009 | 1992 Subaru Legacy

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