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What does oil in the overflow tank mean? - 1997 Pontiac Firebird

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If its engine oil most likely you have a blown head gasket or a cracked head.if its transmission oil(aka fluid) then you most likely have a bad radiator that has an internal rupture of the trans oil cooler

Posted on Jul 12, 2010

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Head gasket or cracked head

Posted on Jul 12, 2010

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SOURCE: what does it mean when oil is in the overflow tank

overflow as in radiator overflow? if this is what you mean,, you could have a bad intake manifold gasket , or even possibly a head gasket , do a compression test on the motor,, look for cylinders that have a lower reading

Posted on Sep 09, 2011

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Why is the coolant overflowing when the temp guage gets half way?


well the tank must never be full, when engine is cold
was it? (read operators guide to see methods)
water expands hot, and the tank captures this expansion
that is normal.
what does "until its all gone", mean, what is IT?
there are lots of tests.
the first one, is,
IS the engine overheating,?
try a new rad cap, they are dirt cheap.
and, is the oil or carbon in the RAD neck, cap off , cold engine>?
is there water in the engine oil, milky dip stick end?
same with A/T trans? milk, or pink/red ATF.
is there steam going out the tip of the exhaust pipe on a fully hot engine>? yes/no?
is air and water exploding in to the side expansion tank.?

cold engine
remove rad cap'
fill rad with 50% AF.
new cap back on.
put 50% AF 1/2 way up in to expansion tank(its marked clearly)
start engine , does it overflow now>?

Jul 04, 2014 | Saturn SL1 Cars & Trucks

1 Answer

Milky antifreeze in overflow tank


THIS MEANS THERE IS A MIXTURE OF WATER AND OIL SOMEWERE,CHECK THE WATER PUMP GASKET

Jan 20, 2014 | 2003 Dodge Durango

1 Answer

There are two hoses on the radiator overflow tank one connects to the top of the radiator , but i have no idea wher the other one goes


On my car and truck,, they are overflow,,meaning they come out of overflow tank and drain to the ground in case of "overflow{

Feb 05, 2013 | 1999 Chevrolet Express

1 Answer

What does it mean when oil is in the overflow tank


overflow as in radiator overflow? if this is what you mean,, you could have a bad intake manifold gasket , or even possibly a head gasket , do a compression test on the motor,, look for cylinders that have a lower reading

Sep 09, 2011 | 2000 Oldsmobile Intrigue

1 Answer

Oil in overflow tank


Could be tranny fluid or engine oil. Check trans and engine oil and see if they have water in them.Water in engine oil can mean a bad head gasket but could also mean bad intake gaskets or oil cooler if it has one.( rare on this car)Water in the trans most of the time means oil cooler in the radiator. This is bad and will mean transmission failure soon. The chemical reaction of the antifreeze and transmission fluid damages clutches and internal seals.

Jan 26, 2011 | 1994 Buick Century

1 Answer

I keep going through coolant yet when the van sits there doesnt seem to be a leak .... i did notice on the overflow tank there is a opening to where it looks like hose should be ...should there be one...


If no leak is found inspect the inside oil fill cap to the engine. If a yellowish cluster of pudding I call it is stuck inside the cap that is caused by coolant mixing with the engine oil. That means your head gaskets are at fault and they are in need of a replacement

Dec 23, 2010 | 1998 Dodge Caravan

1 Answer

Oil in the antifreze over flow tank


Yes, oil in the antifreeze typically comes from a blown head gasket. To verify, start the truck and watch the overflow tank you should see what looks like a back flow or bubbles. By the time the truck get to normal temp, it'll be obvious.

Feb 23, 2009 | 1993 Chevrolet K1500

2 Answers

Motor oil leaking into overflow


If you mean the coolant overflow I would check the oil dipstick for water oil. It will appear white/tan. If this is the case I would firmly suspect a head gasket.

Nov 04, 2008 | 2000 Oldsmobile Alero

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