Question about 2000 Chevrolet Cavalier

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Water from the radiator reservoir comes out the overflow hose. A new radiator cap did not solve the problem.

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  • Donald Tucker Mar 23, 2011

    Does the car tend to run hot? I had a Cavalier that had the same symptom and I changed the thermostat and water pump. It helped for a while but in the end I had to replace the car because the cylinder head was damaged.

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When vehicle gets hot and has too much fluid it dumps what itdoesnt need then later as it cools it sucks back what it needs sounds like the level of fluid in reservoir is too full only fill to line on jug....also inspect overflow hose...unless it is overheatingthe rad cap is pressure sensitive....if this is problem thermostat stuck closed replace thermostat.

Posted on Mar 23, 2011

  • forenza Mar 23, 2011

    replacing thermostat didn't work any other suggestions

  • Donald Tucker Mar 23, 2011

    The next thing would be to take a compression check to see if there is a head gasket leak.

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1 Answer

Water is leaking from under my engine any suggestions about where it might be coming from?


Likely sources:
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  2. Water pump
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  5. Radiator cap

May 12, 2015 | Cars & Trucks

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Water disppaearing out reservoir box ew radiator.......


Could be your water pump is leaking or a loose hose clamp,to find out for sure Sherry,you need to get under front and look for antifreeze,will need a flashlight,and follow to where it's coming from.Usually when cold,the antifreeze will be on that mark on the overflow container,then after driven for a while,it will expand and rise to the hot mark.You also have heater hoses going to heater core,is floor board in front wet.You have a hose going to thermostat and water pump.Also check radiater cap.

Mar 22, 2013 | Cars & Trucks

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2002 Oldsmobile Intrigue- Radiator Flush


you may need to replace the thermostat or the water pump to solve the overheating issue.
The leak in the overflow was NOT the cause of over heating.
You do have a radiator cap. It is the one on top of the overflow.

The radiator drain petcock is on the bottom of the radiator near one of the corner edges.
(Some face engine, others face the grille)
If for some reason you still can not find it, you can always pull the lower radiator hose (make sure water/engine is cold)

once you flush/fill the system, use a 50/50 mix of water and the proper antifreeze. (older cars use green, newer use orange)

If you are unsure, just ask the guys at the auto parts place which one you need and note that they sell an orange color that can be safely used in old and new cars and it can also be mixed with any color of fluid.

After you have the system filled, start the engine and remove the fill cap.... let it run and watch for air to rise out from the opening. (Some coolant/water may overflow, but you need to watch for any air bubbles coming out)

Once you don't see any air trying to escape, put the cap on tight and you should be good to go,

Another cause for overheating is air trapped in the system.

I hope this helps.

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1 Answer

Car loses water from overflow cap. Replaced water pump, thermostat and overflow bottle and cap.


Stop me if this has NOTHING to do with your problem (or if it's already been solved)...I don't know a lot about cars so...My Ford Taurus kept overflowing antifreeze from the reservoir cap. Car started to over heat and kept spilling"/dumping" antifreeze every time I turned the car off. The antifreeze reservoir had been replaced less than a year prior, and water pump, radiator, etc looked at. I got a free estimate that stated my water pump was NOT the issue, but I did need a new radiator and my reservoir tank needed to be replaced (again)....$800 parts and labor.... However...I noticed the overflow holes on the tank, and also that the orange liquid (antifreeze), was also spilled around the cap lid. I also noticed the CAP on the antifreeze reservoir would loosen when tightened completely- hence, not sealing correctly. So I went to the dealer, bought a new reservoir cap for $15, replaced it, and never had an issue after! I also found out that the CAP was a DEALER PART ONLY, and when the tank itself was replaced, the CAP was the OLD one! Problem fixed! Maybe it's similar? Or something "more serious".

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Coolant fills overflow then overheats, have changed thermostat and temp sensor. is the water pump shot or a rad problem.


You got it right.
To determine which one is the right one:
1- Take ioff the thermostat, Run the engine without it. If water is coming out at the upper hose then pump is working.
2- Hook the upper hose back to the radiator without thermostat, run the engine and press the upper hose to see if coolant flowing throu it. If it is not then , the radiator gets clogged up.
3- At this point , you know what to do. One advice is that, get the new radiator if it is bad. Don't waste money to have it rebuilt. Good luck.

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1 Answer

Have new radiator, water pump hoses, belts; system has been bled; experimented with bypassing the heater core; thermostat removed...car still overheats. Also, coolant goes to the overflow bottle, but often...


The reservoir,and,or,the tubing from the radiator,to the reservoir may have a pin hole in it,or the tubing is sucking together.Replace the tubing,and the radiator cap,and the reservoir top.See if it will work correctly.Fill reservoir,and radiator,and let it run until the cooling fans cut on,then cut the engine off.Wait about 25 minutes,and see if the reservoir will drop in level,if so,repeat this process until the vehicles cooling system is normal.Make sure the cooling fans are coming on,and going off,with the ac off.If the cooling fans are coming on,then that is good,but,they must go off by them selves,or the cooling system is not cooling down.

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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

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