Question about 1999 Cadillac DeVille

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Coolant disappears andthere licaeum - 1999 Cadillac DeVille

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Does coolant disappear with no sign of leakage. If so, then you might have a porosity leak. Unfortunately, this is a common problem with Cadillac motors. The internal surfaces of the engine components become porous and actually begin to absorb coolant. This can also occur in any engine that makes extensive use of aluminum. I do not know of an easy fix for this problem at this time. I don't think block seal will work in this case. A replacement engine might be the best solution to this problem. Check for oil in the coolant before scraping the motor.

Posted on May 25, 2011


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Posted on Jan 02, 2017


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2002 Lincoln LS Check engine temp and reduce speed came across screen, car started reducing speed then died NowThe coolant keeps disappearing its not leaking anywhere. What could be the problem?

Coolant just does not disappear!!!!!!! Either you have a leak somewhere or perhaps one of your engine head gaskets is shot and leaking coolant into the oil passages. Check your oil for color. If it has the color of a brown mud that is the cause of your problem.

Re leaks check all of your heater and engine hoses and clamps. Do not overlook your radiator cap nor your expansion tank for leaks.

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My antifreeze leaks out every two week

leaks to passenger floor
to garage floor,
or you mean, the coolant just disappears like magic.
disappears in the overflow tank?
and or actual radiator. top fille?. (no engine option stated, so...)

if rad has a cap, some dont, we remove the cap , engine dead cold
never hot, and look to see if its full, if it keeps dropping
the coolant loss can be ? (rapid, and 2weeks is rapid)

1: bad head gaskets, or worse cracked block/head.
running 50% antifreeze ratio> , is it cold there,????????????
2: A/T tranny the , tranny cooler can fail too, and put AF in the ATF.
that means look at dip stick on A/T is it pink or UGLY?

is it freezing there, no location stated, so cant guess.
if yes, is the coolant ever allowed to drop below 50% ratio?
got a coolant hydrometer, check it each late summer, ???
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Audi a6 quattro 2001 coolant disappears, engine overheats and white smoke comes out

Unfortunate you're losing coolant into the cylinders, where it's being burned off and exiting out the exhaust. When you initially added that cold coolant into the hot radiator, and hot engine (sit down) you likely cracked the engine block. Best case you just need to replace the head gasket.

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You stated Coolant disappearing then I add coolant and stops overheating? If no puddles under car, check oil dipstick and see if it has coolant mixed witht the oil for a gasket problem. If no coolant you may have a bad radiator cap and losing the coolant as you drive. The pressure and pump will force it out as you are driving to where you are not aware of it.

Sep 10, 2012 | 2000 Audi TT

2 Answers

Coolant disappearing

If your coolant is disappearing most likely you have a coolant leak I would suggest going to a auto-zone or auto-zone like auto parts store and picking up a bottle of stop leak. You should then add it to your coolant and it can stop small leaks in your coolant systems. if this dose not correct the problem I would suggest taking it to a certified auto shop and have them take a look at it.

I hope this helped.

Thank you,

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Toyota previa 1994 model auto transmission fluid

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Cooling sysem leak

Leak found at heater.  Most of coolant added in attempts to locate leak was retained on the floor of the passenger compartment --- hence the disappearing coolant phenomenom. About 5 gallons of water were obtained with wet vac of region under floor carpet. Thanx to those who considered the problem.

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Overheats and water in radiator disappears

there's a chance you have a blown head gasket. If that's the case, your coolant isn't disappearing, but leaking into the cylinders. Check your oil. If it looks kind of milky, it means it's mixing with your coolant, which indicates a blown head gasket. Any white smoke coming out the tail pipe is also a tip off.

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