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Posted on Jan 02, 2017
ilragatzzo78 is 100% right. I had the same trouble with my 318ti. It took a lot of sitting on the side of the road. The only solution is time. Bleed, bleed and re bleed. You can bleed it through the bleeder screw on top of the radiator (plastic screw). I didn't know about the angle part, but thanks for the idea..
Posted on Aug 02, 2008
Yes, due to many things.
No ....1 Did you replace the thermostat ?
Take out the thermostat, and pop it in a saucepan covered in water, bring to the boil, and see if it opens, this will confirm if this is the fault.
1. The cooling system must be topped up, and pressure tested to max running pressure 15lb sq in.
If there is an external leak this will show it up, possibly from cooling or heater hose, water pump, radiator, or the heater matrix.
If nothing is apparent an internal leak, must be then suspected, ie head/s or head/s gaket/s.
2. To test out this , a carbon monoxide test, should be carried out on the cooling system, by passing, a sample of the cooling system gas, when engine is at normal running temperature ,through the test fluid in the vacuum tester.
If the fluid changes color, this is proof the combustion chamber gases are escaping into the cooling system, which over pressurizes the system and normally blows the coolant out of the header tank overflow, as you drive along, and you do not see.
The other symptom of this problem, is the coolant leaks back into the combustion chambers, when the engine is switched off, and when you start later, a misfire is noticeable until the spark plug dries out.
Also if the plugs are removed, and after 1hr of cooling system pressurizing, the engine is spun, any coolant from the plug holes will confirm head, or head gasket failure.
I hope it is the thermostat....?
Let me have your thoughts !
Good Luck !
A FixYa rating is all I require...Thanks...John.
Posted on Feb 16, 2009
I know that this is going to sound like of dumb but I would check and make sure your thermostat was installed the correct way. I had a similar issue once, after replacing the entire cooling system on a 750iL it still over heated, turned out I put in the thermostat the wrong way. Always check for little mistakes first:) Hope this helps and please don't forget to rate me.
Posted on May 21, 2009
the "sniffer" in this case is a device to detect the presents of combustion gasses in the water or radiator .... if there is a good head gasket seal then there should be no combustion gas in the water .... if there is even a small leak then the high pressure gasses will be forced into the water .. the opposite is true when you turn off the engine ... as it cools, pressure in the radiator can force water thru the leak back into the engine .... this also happens during the intake stroke .. so you would be losing water that you might see or smell come out the tail pipe ...the fact that the failure has happened a second time might indicate that you had a warped head or block .. or perhaps a micro crack or surface flaw.. those things should have been checked when the last repairs were done ... i am wondering if the repair shop might negotiate a reduced rate for the redo ... often heads are slightly machined to remove any warp or surface faults during such repairs (if any problems are suspected) ... a used replacement engine could have the same problem or worse .. so if yours is otherwise in good shape then it might be worth while to give it another go ,.. sounds like a good garage, hopefully they will cooperate ... and they might be interested in finding out themselves what happened ...
Posted on Apr 10, 2010
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