Question about 2000 Chrysler LHS

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Water was boiling and spraying from overflow / reservoir tank from what appears to be a factory made hole. was there a plug in there that might have rotted off and caused this?

I noticed my gauage was running hot and saw smoke coming out from under my hood. when i opened it up i realized water was sparying out of the overflow / reservoir tank from what appears to be a factory made opening. could it be possible that there was a plug in there at one time and it might have rotted away causing the fluid to spray out of there? the water in the tank was boiling. any suggestions?

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Well that mean that oone your thermostat is not opening or your water pump or possible that a hose might be collapsing to cause the water not to flow

Posted on May 25, 2009

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Sounds like your describing your overflow spout on your reservior and the hose that directs the overflow to the ground blew off. This is not why your cars over heating though. Check thermost, water pump, hoses, water/ antifreeze levels, and when your done fill up the radiator run car to get it warm and bleed the air out of the system. Check to see fans are coming on.

Posted on Oct 02, 2009

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It is 1997 Toyota Avalon, there is a trace of overflow of coolant from the reservoir tank after test driving.(I wanted to buy that used car). Around the tank and coolant cap, some traces show overflo


The car may have a compromised head gasket, forcing air pressure into the cooling system, displacing water/coolant mixture and forcing it out into the reservoir.

This can be expensive to fix if it's the case, but it could be that it has a faulty radiator cap also.


does it have proper antifreeze/anti-boil mixture, or just plain water?
if it's plain water, it may indicate that this is an ongoing problem that the current owner hasn't fixed.

Check the cap and see if it seems loose, the spring inside should be firm, and the inner sealing ring (rubber) should not be cracked or damaged. if the system is leaking, this can cause similar issues where the coolant boils off into the reservoir.

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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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The car was overheating i checked all hoses and replaced the thermostat the radiator it still is ovrheating and the water is boiling in the overflow tank


Answer could be a faulty thermostat,or it could be a sign that your head gasket is about to blow ,or last of all your timing could be out of sync.

Answer 2 from Inventus: It means your cooling system is funtioning properly. In a system having a coolant recovery tank, coolant in the radiator is always up to the brim, hot or cold. There is negligible or no air space. When coolant in the radiator expands sufficiently due to warming from the engine, it will squeeze past the pressure cap's bottom seal and flow into the recovery tank. (If no provision for such expansion was present, the expansion would rupture the radiator or your hoses.) Only coolant within the radiator is under pressure, and because of this pressure (together with the elevated boiling point that the "anti-freeze" permits), it normally does not boil. But once past the pressure cap's bottom seal, the overflow is at atmospheric pressure and therefore boils.
This boiling is usually unnoticed after a short, i.e., local, trip because the cooler coolant already in the recovery tank quenches it. But after some highway driving the influx of more hot overflow heats up all the coolant in the recovery tank to the (unpressurized, i.e., "natural") boiling point.
As the engine cools when shut off, the contracting coolant in the radiator sucks back coolant from the recovery tank. Fluid in the recovery tank should never be below the "full hot" or "full cold" marks, lest air be sucked in.
-- BETTER ANSWER ==
Your cooling fans are not turning on. It is not normal for your overflow tank to boil like that. It is true that your radiator is overflowing into the reserve tank, but that means yourr adiaotor is boiling. Check for blown fuses or relays for your cooling fans. IF theya re fine. run your engine for about 15 minutes and drive. When you temp level is at normal operating temp open your hood with the engine runing and see if your fans are on. If they are, then you may have a bad thermostat or a plugged radiator, or a bad water pump. If the fans are not on, get your cooling fan switch replaced if your car has one. Check your temp sending sensor

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Radiator coolant or reservoir tank always full


Relax, there is no problem.

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