Question about Cars & Trucks
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.
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
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.
Posted on Mar 02, 2009
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
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
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