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1995 bwm 318I over heating coolany bubbing

My 318I was leaking antifreeze & the ran hot. After it cooled down, I let it run w/ Rad cap off & shortly after, the water started to bubble. There was no fluid on the floor after it was cooled & filled. It continued to get in the red zone while running in place. No work has been done it any of the cars systems. I just had the car inspected (it passed) and an oil change yesterday.

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As it runs and arrives at normal temperature and higher, does the radiator fan kick on? (Check that AC is off first.) This should be very obvious with the hood open. If the fan does not kick on, that would explain the over heating.As it gets into the red, turn on the AC, this should kick on both rad fans. If one or both does not work, that is the place to look. If one works with the AC on, it should be enough to drive to a shop. The biggest problem being while standing still. (As you move forward, 40 mph or more, enough air is forced through the rad that you don't need the fan.

While running with the rad cap off, you saw many small bubbles?
Did you see any sign of smokiness coming from the open cap.?
In this case it is possible that the head gasket has failed and is leaking exhaust gasses into the cooling system, forcing out coolant through the overflow.

Posted on Nov 21, 2013

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Posted on Jan 02, 2017

hbsurfdawg
  • 95 Answers

SOURCE: Car continues to run hot

Sounds like you have a defective water thermostat as long as nothing is seen physically leaking when it is warming up in the first 2-5 minutes.

If you are a do it yourselfer, carefully remove the thermostat without damaging the gasket.

Replace it as preventative maintenance if it has not been replaced from 50-95k miles. It can be lower but that is a good range when you replace one.

E

Posted on Mar 02, 2009

  • 50 Answers

SOURCE: 2004 cheverolet impala 3.4L engine

Sounds like you have an air;lock in your cooling system.Try placing a bleeder on the return hose to the heater core ........looks like a small tap

Posted on Aug 18, 2010

  • 101 Answers

SOURCE: leaking water and antifreeze,not all

Could be a couple of things going on here. The worst case is a leaking head gasket, or best case is a bad thermostat. that is no opening all the way. Take a small hammer and GENTLE hit the housing for the thermostat that sometimes will free it up.

Posted on Feb 27, 2011

  • 978 Answers

SOURCE: my 2000 lincoln ls 3.9

make sure you bled it properly and no air trapped in your cooling system .other than that you could have a blown head gasket

Posted on Sep 13, 2011

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over heating has many causes.
what are the signs, just the gauge going high. ?
steam shooting out rad cap. (is the cap even good>?)
side recovery tank, blasting? with hot water and steam.
oil in the RAD neck , (cold engine) RAD=Radiator assembly.
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does the RAD fan come on , overheated, It must. does it?
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they are cheap . and easy to change out both cap and STAT.
are you running 50% AF? , using the Prestone $2 tool for the test?
AF raises the boiling point of water, to 260?F
the cap holding pressure and the AF both raise it that high.
if car does not over heat, moviing, only, nows that time to say so..
get in car, cold , drive did it overheat with no stop signals?
(moving gives free air flow to the RAD, proving it works)
Use the radiator leak down tool. to see of loop is beached.
Use the Exhaust gas detector tool at RAD cap to see if the head gasket is blown.

how do you know the pump is. bad.
1: it leaks
2: the impeller is dust.
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my answer, the pump is after all other test pass.
including a RAD core, thermogram
i can check each rad tube 1 by 1, in fact i threat my RAD
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see 50 mile test here, RAD cores
They get 34f degree tube drops.. each tube must drop or its clogged.
all for a $15 tool and no burned fingers.
measure each tube about 2inch from top of tank and bottom
and both tanks. (this test is very revealing)
http://www.fixkick.com/Cooling-engine/therm-o-gram.html

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