Question about 1995 Chevrolet Lumina

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Rapid temp. change with overheating problems

We've changed thermostat, coolant temp switch new radiator and flushed the entire cooling system

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  • Anonymous Mar 17, 2014

    overheating problem



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Have the water pump checked.

Posted on Jan 27, 2009


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I had a bottom radiator hose blow off my 05 equinox and I flushed the block then the heater core a d changed the thermostat put all new coolant in and still keeps overheating

What about the radiator? Water pump? Can you check for coolant flow? There could be air in the cooling system? Do you trust your temp gage? Are there overheating issues besides the temp gage showing hot, like coolant overflowing, under the hood, somewhere?

Dec 15, 2016 | Cars & Trucks

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Can flushing a radiator that was very rusty lead to thermostat and radiator breakage?

Possible but could have had a airlock in the system caused by the coolant change. This happens when changing coolant and not all the trapped air is purged front the system.

Oct 05, 2017 | 2003 Chrysler PT Cruiser

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Does ford 3.8 v 6 temp sensore thread into water jacket?

maybe air in the system? park it on ramps or a good uphill slant and remove the radiator cap and let it burp while you refill the radiator with coolant

Oct 02, 2017 | Cars & Trucks

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2005 pontiac aztek-overheating,has coolant,new theromast and fuel filter

Air in the system , bad water pump , cooling fans not working ! Maybe you should take to a shop ?

Jan 21, 2012 | 2005 Pontiac Aztek

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My 1998 Isuzu Rodeo is overheating while driving. I noticed it yesturday on the hiway. The temp gage started to go up approching the red while I was on the interstate. When I got into town and was going...

if the radiator is clogged or (gunked up) prestone makes a kit to flush the coolant system its sold at most parts stores you will cut the upper heater hose and put the adapter in line than pour in a flush of your choice and follow those directions it should end with you attaching a water hose to the adapter and flushing the entire cooling system. And yes i would definitly change the thermostat especially when you say it was approaching the red this could be the first signs of a sticking thermostat. hope this helps

Jan 30, 2011 | 1998 Isuzu Rodeo

3 Answers

Luke warm heat in a 2002 expediton

Start with Flushing out your cooling system. Flush it out with Preston Radiator flush, you have your preference of ether the super flush which takes 3-6 hours or the 10 min flush which is good if you don't have the time to flush out your cooling system.

After you have flushed out your cooling system, replace your thermostat and you should be good for another cold winter driving. What happens is that after a few years of the coolant not being serviced, the coolant crystallizes and clogs up the heater core and radiator causing poor circulation. Poor circulation will cause poor heat and or overheating issues to the engine.

Before you go through all that inspect to make sure you have the right amount of coolant in your cooling system.

Good luck and thank you for using fixya

Nov 04, 2010 | 2000 Ford Expedition

1 Answer

What cause engine overheating

Several problems can cause it. A thermostat that is stuck closed (will not allow coolant to circulate- remove and place in a pan of boiling water, it should open rather quickly). Engine cooling fan(s) not operating as temp rises (when temp gauge goes up past normal range, check to see if fan is running. If not, it could be a switch that controls the fan operation, or less possible, a bad fan motor). A radiator plugged up with rust and sediment won't allow proper circulation of coolant, resulting in overheating. If coolant has not been changed in a long time, or appears rusty, flush the system thoroughly. You may need to have the radiator professionally flushed if it's plugged up bad. Good luck!

Apr 20, 2010 | 1995 Mitsubishi Galant

2 Answers

Temp gauge went past hot, pulled over car did not appear to be overheated, we have had a few days of very cold outside temps, but I recall this car's thermostat was removed completely and not replaced. Any...


If the car is overheating, especially in cool/cold weather you have a serious problem which needs to be addressed immediately. I very much doubt that the coolant temperature gauge is giving an incorrect reading and if you drive the vehicle with this problem you are risking expensive engine damage. In any event a mechanic can easily use another water temp gauge to check if the gauge in the car is giving a faulty reading.

If the thermostat has been removed - as you say - then there is nothing mechanical isolating/blocking the full flow of coolant between the radiator and engine despite the engine operating temperature.

Removing a thermo because of a previous overheating problem is not a sensible move because it does not address the underlying cooling problem issues. An old or faulty thermo should always be replaced with a new one and the causes of the overheating investigated and fixed. The fact that the thermo has been removed suggests that there was a cooling problem previously and it is likely that it was not due to a sticking thermostat.

Overheating can be caused by and one or more of the following:

1. Low coolant level. Check the coolant and top up. All coolant hoses (including heater hoses) need to be checked for deterioration and leakage. Suspect hoses need to be replaced .

2. A sticking thermostat which impedes the flow of coolant between the radiator and the engine when the engine warms up. A new thermostat needs to be fitted.

3. Debris in the coolant which is impeding coolant flow through the engine. Coolant needs to be changed every 2 years and the system flushed to avoid this problem and to address deterioration of the coolant mix.

4. Air locks in the cooling system from the inadequate bleeding of air from the system.

5. A faulty / corroded water pump. If the water pump has never been changed or you have no record of it being changed in the last few years then it needs to be removed, checked and replaced unless in good condition. A faulty water pump cannot push coolant through the system (or flow it fast enough) and your engine will definitely overheat.

A badly tuned engine can also cause an engine overheating problem in certain circumstances but in your case I suspect the issue is definitely with the cooling system as outlined above.

We cannot test and inspect your car so it is not possible to identify the exact cause of the problem in your case. I hope this helps and please get it checked out straight away by a reputable auto shop. Otherwise you are risking expensive engine damage and having to replace the vehicle entirely.


Dec 07, 2009 | 1994 Dodge Shadow

1 Answer


You could have several issues here. A blockage in the radiator, bad coolant temp sensor, (not turning the cooling fan on) a bad cooling fan motor. sounds as if maybe one of these may be your primary issue, and the cause of the overheating that originally caused your head gasket problem. Hope this helps

Aug 22, 2009 | 1998 Volkswagen Beetle

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