Overheating 525i 96

[fenhow]

Hi all. The message borad has been great. I am wondering if someone out there can help me.

Problem - 1996 BMW 525i Overheating

Already Done - Thermostat, Waterpump - metal impeller, Radiator Test and Flush.

Compression Check - OK

I am still overheating. It is driving me .

Getting a lot of steam and boiling in the overflow tank. Can anyone give me some insight?

Thanks alot.

[RobPatt '93 525ia @123K]

No leaks, no blockage; perhaps no circulation? 1. Fan bad? 2. T-stat installed backwards? 3. System not bled of air?

-Rob

Hi all. The message borad has been great. I am wondering if someone out there can help me.

Problem - 1996 BMW 525i Overheating

Already Done - Thermostat, Waterpump - metal impeller, Radiator Test and Flush.

Compression Check - OK

I am still overheating. It is driving me .

Getting a lot of steam and boiling in the overflow tank. Can anyone give me some insight?

Thanks alot.

[632 Regal]

air pocket?

[632 Regal]

hmm... steam, if it is bled correctly I would have to guess that your headgasket might be the unfortunate culprit.

[Anton CH.]

M50 is very tolerant to air pockets. I believe the coolant system in our cars is meant to be pressurized. With the expansion cap closed, are the coolant hoses rock hard? This would be a good indictication of air seeping into your coolant system from the combustion chamber.

[fenhow]

hmm... steam, if it is bled correctly I would have to guess that your headgasket might be the unfortunate culprit.

Not sure if the system is properly bled. I would be a very happy camper if that was the problem. How do I accomplish this?

Thanks..

[fenhow]

I was thinking the fan. How can I check that as well? How do I know if it is working. I am just replacing parts one at a time here...

Thanks

[fenhow]

Hi, expansion cap? Is that also known as the radiator cap? If so, the hoses do become hard when the system starts heating up but not at first. I can still squeeze them but it does take some force?

Where would the air be coming in from?

[fenhow]

Man, I dont want to hear that. The head gasket is the last place I want to go for this one. I say bleed..... bleed is the problem :-)

[fenhow]

One more thing, I get no heat when turn on my heater.