Question about 1999 Oldsmobile Alero

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Water constantly gets hot and overflows out. changrd thermostat.

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First make sure the cooling fan is working properley next check for blowen head gasket, auto parts makes a kit to test for that...Hope this helps???

Posted on May 22, 2011

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Mitsubishi shogun 1998 model 2.8 over heating no leeks water is blowing back into the overflow bottle when hot


How are you sure it is overheating? Temp gauge? Most likely are stuck thermostat, bad fan thermostat switch, bad fan. bad head gasket. Coolant going into overflow when hot is how that system is suppose to work. As it cools, fluid is drawn back into radiator. It it is not really overheating, bad radiator cap can allow coolant into reservoir more than normal.

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The radiator cap isn't getting hot and needs water to replaced frequently


radiator hose may be closing together after running for a while causing water to overflow to tank and ground

Jul 22, 2014 | 2001 Dodge Caravan

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Water coming out overflow , hot engine


It sounds like the thermostat is stuck closed.

Apr 06, 2014 | 1995 Cadillac Seville STS

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Can a water pump make water to return to the water bottle


If the engine overheats from a thermostat
stuck closed or bad head gasket

Aug 10, 2013 | Cars & Trucks

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Changed the thermostat car still getting hot pouring out of the overflow only place we can find leaking what causes this


the radiator is partially blocked, and heat transfer from water to air cannot be acheived, the radiator, if in good condition can be taken apart and the tubed cleaned, if the radiator is showing signs of fin deteriation, the whole thing must be replaced.

Dec 01, 2012 | Cars & Trucks

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My 1998 Honda Civic EX 2 Dr coupe constantly overheats. We have tried boring out the thermostat, and replaced the radiator cap which helped somewhat. It keeps blowing the lid off of the overflow resevoir...


Cracked Cylinder head or cylinder head gasket blown. Bet you filled it up with cold water when it was hot! Check your oil level, see if it is going up (water getting in) Remove the rad cap start your engine and if it blows the water out then i'm probably right.

Feb 02, 2011 | 1998 Honda Civic

1 Answer

1996 buick roadmaster. temp gauge goes almost all the way up to hot after driving about 10 miles. i'm thinking thermostat?


I assume you have a 3.8L V6. Probably thermostat, but first take a look in the radiator to make sure it is full. Not just the plastic overflow tank, take the radiator cap off and look. Make sure the engine is cold though. The radiator should be full to the top. The way the system works is that as you drive your car, the water heats up and expands and the check valve in the radiator cap will let the overflow go into the plastic tank when the pressure get over a set amount usually 14-17 lbs. When you shut off your engine, the water will be slowly sucked back into the radiator as the engine cools. if the radiator cap is bad, it may not let the water get sucked back into the radiator and the engine will run hot, you will get air and steam bubbles in the engine, the thermostat will work as long as it has water running by it but if a slug of steam goes by it, it will close. "Burping" that engine is a pain but just keep the overflow tank full and check it every time you *start* the car. The air will work itself out.

Nov 18, 2010 | 1996 Buick Roadmaster

1 Answer

Car is not running hot but the overflow tank is bubbling hot


I would flush out the cooling system and install 50/50 antifreeze to water solution and check that the cooling fan is going on and also that the thermostat is not stuck closed.

The overflow tank should never get hotter than the rest of the cooling system.

Jul 05, 2010 | 1997 Chevrolet Monte Carlo

2 Answers

First Steam then Water coming out of the overflow hose of the radiator reservoir. Is this a thermostat problem or Waterpump. When water is coming out the dash thermometer is approx half way. When I remove...


Your overflow hose is at the first tier after the seal on the radiator cap. The first thing I would check is the cap gasket, then make sure the cap is completely installed, push down hard and turn until it locks into position. If your water pump was bad, you would either be leaking water from the pump, or your car would be running hot. Usually, when you have steam/water coming out the overflow, if it is not a problem with the cap, then you are indeed running hot. If the thermostat is not opening or is stuck in the closed positiion, it will not cause your radiator to overflow, however if it is sticking closed and allowing your car to overheat then opening at a higher pressure, it could happen. Check the components in this order, gasket, cap installation, then thermostat, (you can replace the thermostat for about 10 dollars. Good luck

Oct 06, 2009 | 2000 Mazda 626

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