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      10-09-2019, 10:53 PM   #1
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BMW X3 35i Overheating after replacing Oil Cooler Gasket


I went to my mechanic to check the minor leak from oil filter. He diagnosed to me to change the oil filter gasket and oil cooler gasket .
After a day he called me and said you also need to change the Valve Cover Gasket.

I trusted him and changed all. I picked up the car from service center. Within 2 weeks i started realizing my car is overheating.

The first time since i bought the car, i got a overheating warning with yellow followed by red on highway.

I took it to my other nearby mechanic and explained him about the recent fix on. My bmw. He had a first glance on Coolant color and told me whoever topped it off is wrong coolant. The color was Green, usually it should be blue. But then he told me to go back to the service center and get it check first.

Also today, I started my car drove it for only 10km parked and was seeing my temperature on engine on. But suddenly , i hear a loud fan noise from the hood and stopped the engine to cool off and took my car back home.

I am going tomorrow , these guys are certified delearship from my extended warranty People Choice Company.

Do you think it is happening from its recent work ? Oil filter and oil cooler gasket or valve cover gasket change because my car was perfectly fine before it.
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      10-09-2019, 11:45 PM   #2

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When one changes the oil filter and cooler housing gaskets the cooling system is opened, some fluid is lost- or the shop may have drained fluid prior to taking the housings apart- that is normal procedure.

The overheat could be due to the system not
Being properly bled of entrapped air after it is closed and topped off. bleed should always be done after the cooling system is opened. Entrapped air in coolant can cause intermittent overheat.
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      10-10-2019, 11:10 AM   #3
tracer bullet
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Originally Posted by Wgosma View Post
Entrapped air in coolant can cause intermittent overheat.
Totally agreed. Not just because air is int he system instead of coolant (air wont' conduct heat away nearly as well) but also because when those air pockets hit the temperature sensors it can really make them go nuts (a much higher temperature for that air pocket than for the coolant itself).
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      10-10-2019, 03:06 PM   #4
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Agreed about bleeding, that can leave air pockets, and they can fcuk the engine. What the 2nd mechanic said about coolant, OP has to make sure if it's not the BMW coolaid, then it has to be compatible - the BMW coolant I believe is phosphate free or something - they (BMW) say it's important how this could react (or not) with the gaskets & engine block alloy.
Could also be that the WP (Or T-stat) gave up the ghost coincidentally. That loud fan noise is usually the tell tale for these engines......
f25 N52
e83 N52
e46ci M54B25 (e53 N62 - sold, R.I.P. e39 M54B30)
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      10-11-2019, 08:35 AM   #5

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When you say "approved dealership" I assume you do not mean dealership, but you mean a repair shop. Being "approved" by an extended warranty company doesn't mean anything good - it means they are cheap. If they put generic green coolant in your car you have to insist they flush the entire system and put in BMW fluid. Don't let them tell you it was "just a little" or it's "okay." It's not okay. It's wrong.
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      10-12-2019, 06:49 PM   #6
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Another possibility - failing coolant pump or thermostat. It may have failed because of oil mixed into coolant, or incorrect bleeding procedure, or just because it is a coincidence.
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