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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Thu, Mar-08-2018, 07:49:23 PM   #11
Nate047
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Default Re: Cooling System Help

Is there any coolant in your oil or vice versa?
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Old Sun, Mar-11-2018, 07:14:13 AM   #12
MrMark
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Default Re: Cooling System Help

Oil and coolant have been changed fairly recently so itís hard to say. Going to do a proper leak down test to be certain.
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Old Thu, Mar-15-2018, 03:13:42 AM   #13
1badtantrum
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Default Re: Cooling System Help

just went through a cooling upgrade and very similar symptoms. After reading many posts to try and figure out what was going on here is what worked.
car off, cool. Make sure the expansion tank is full even a little over as some may be scavenged. Raise the front of the car (jack, ramps...) Remove the top radiator hose from the radiator. Raise the hose up but don't kink it and fill with fluid through the top hose. It will back fill the radiator and eventually fill the block up to the point where fluid will run out the top radiator inlet. Secure hose to radiator quickly to minimize fluid loss. Start car and open the little bleed plastic plug on the expansion tank. Monitor the temperature during running so it doesn't overheat. You should see some bubbles and fluid kind of percolating out of the hole. At some point the thermostat will open and the flow may become a little more eventful. Eventually, the bubbles will stop and there may be just a very slow stream of fluid that pushes up out of the hole. Put the plug back in, adjust the level of fluid in the expansion tank, take it for a ride. You may have to adjust fluid in the expansion tank after that but it should be good. I spent way too much time trying to bleed this system of air before resulting to this procedure I found.
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Old Sun, Mar-25-2018, 05:45:14 AM   #14
MrMark
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Default Re: Cooling System Help

Quote:
Originally Posted by 1badtantrum View Post
just went through a cooling upgrade and very similar symptoms. After reading many posts to try and figure out what was going on here is what worked.
car off, cool. Make sure the expansion tank is full even a little over as some may be scavenged. Raise the front of the car (jack, ramps...) Remove the top radiator hose from the radiator. Raise the hose up but don't kink it and fill with fluid through the top hose. It will back fill the radiator and eventually fill the block up to the point where fluid will run out the top radiator inlet. Secure hose to radiator quickly to minimize fluid loss. Start car and open the little bleed plastic plug on the expansion tank. Monitor the temperature during running so it doesn't overheat. You should see some bubbles and fluid kind of percolating out of the hole. At some point the thermostat will open and the flow may become a little more eventful. Eventually, the bubbles will stop and there may be just a very slow stream of fluid that pushes up out of the hole. Put the plug back in, adjust the level of fluid in the expansion tank, take it for a ride. You may have to adjust fluid in the expansion tank after that but it should be good. I spent way too much time trying to bleed this system of air before resulting to this procedure I found.
Thanks for the reply, Iíll be noting this method down. Just as a quick update: over a period of about 3-4 days, I drove the car, parked and bled. Let it sit overnight and filled to cold level in the morning as needed. Repeated this 3-4 times and finally had no more bubbles in the bleed screw hole. No overheat problems since, just a weird issue where my temp needle drops below cold randomly and then rises back to operating temp. Iíll be changing the temp sensor soon to address that. Thanks everyone for all the advice!
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Discussing Cooling System Help in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)