Question about 1994 Buick LeSabre

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Overheats car overheats and have put in new plugs, oil, flushed out radiater, put in new thermostat

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Check the water pump and make sure the radiator is clean also check for clogs in the cooling tubes

Posted on Jul 31, 2008


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Suspect compromised radiator.(I'm basing this on the presumption that it overheats while driving or standing. If only while standing, the radiator fans may not be working as they run to move air through the radiator when car is still during idle or at stop lights, etc. If overheating only while standing, then its the fans or thermostatic switch that controls them.)

If overheats while in motion, check exterior of radiator for being clogged with debris or if the metal fins (like aluminum foil between solid oval tubes in which coolant flows) are not corroded.
If exterior is okay, then the interior may be partially plugged up. Have the system flushed, using a reverse flow through the radiator.
If it were me, I'd replace the radiator and get it over with and then put in all new coolant.

Good Luck

Sep 22, 2017 | Cars & Trucks

1 Answer

Engine overheats with no thermostat in and new radiator.

sounds like the block is plugged or the head-gasket is bad. Have you had the block power flushed? check for water (dark milky or foam) in your oil.

Dec 22, 2013 | 1994 Nissan Pickup

1 Answer

97 aurora overheats new stat flush system oil not milky or over filled new cap still overheat but when i put the cap on half way tighten i dont overheat whats my problem

Was the engine overheating before you replaced the thermostat ?
By not putting the cap on tight, you are not allowing the cooling system to build up pressure. So it could be a restriction somewhere like a radiator hose.

Apr 23, 2013 | Cars & Trucks

2 Answers

Car overheats on freeway

Check your oil dats da only other solution to this problem your car might be burning oil and cause it to run hot

Aug 04, 2012 | 1999 Cadillac DeVille

1 Answer

We have an 1998 olds intrigue. I have had the radiator flushed new hose, new thermostate put in about a month ago. The car is still overheating what could be the problem

remove thermostat, and see if it still overheats, check thermostat by boiling water, and drop thermostat in and see if it opens, if opens get new radiator!

Sep 08, 2011 | Oldsmobile Intrigue Cars & Trucks

1 Answer

My 84 cressida is overheating (has new radiator cap new thermostat & gasket have flushed the cooling system replaced the fan clutch with another {not new...used} new antifreeze too) has no leaks no...

It really seems like you'll need a radiator. The rad can appear to have good flow because even if it's plugged, coolant will bypass the cooling fins. If you can get at it, try putting your hand on the surface of the radiator when the engine is hot but not running. The rad will fell relatively cool across the surface if it's if coolant is flowing through the core. Those hand-held laser thermometers are handy for doing this as well.

Jun 25, 2010 | 1989 Toyota Cressida

2 Answers

96 GMC Suburban Started to overheat last summer.

It is probably head gaskets - These need to be replaced.

Aug 02, 2009 | 1996 GMC Suburban

1 Answer

1995 Pontiac Grand Prix GTP 3.4 L

There could be several reasons that may cause an engine to overheat. It sounds like you have covered the most important ones. Thermostat,radiator and water pump. Hopefully you do not have internal damage, cracked head, head gasket, or a cracked block. I would try flushing the heater core and pay close attention to what comes out. You know, is it clogged with stop leak or rust. Then while I was flushing that I would drain the entire system and put in some Prestone super radiator flush. You just add plain water with it and run your vehicle for about 10 minutes. You then empty your cooliant system and refill with antifreeze. The flush works pretty well and if there is an obstruction from a previous owner putting stop leak in the system it generally will clean it out.
BTW, are you sure the thermostat is in properly? Not upside down? I think I would start there before I went through all of the work of flushing the system. It actually sounds like from everything you've done already, that's possible. Hey it does happen once in awhile. Was this car overheating when you bought it? If so, maybe the previous owner put it in upside down, and when you changed it put it in the same way by accident.
Hope this helps.

Mar 10, 2009 | 1995 Pontiac Grand Prix

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