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My 2005 BMW X3 is leaking and overheating?
My expansion tank on my car had exploded. I replaced it. It continued to overheat, so I had it checked out. This mechanic shop that I went to, specializes in foreign cars. They gave me a list of possible problems. I ended up fixing the radiator, water pump, thermostat, the hoses related to the coolant system (upper and lower), and o-rings. It worked for 2 days and then started pouring coolant from the bottom. I've bled the air from the system as best as possible everytime. Well today, I had pulled into a gas station and it started to overheat and was pouring coolant everywhere from underneath, nothing ever related to the top (nothing pouring from the top). I don't know what to do or think? Perhaps I need to get the air properly removed? But what explains the leaking? Thanks!
5 Answers
- The DevilLv 71 year agoFavorite Answer
Your may have been one of the recalled ones that was never given an upgraded water pump to replace the original that had a plastic impeller. Either that or the head gasket was damaged and let compression enter the cooling system.
- Anonymous2 months ago
All this started after an overheat?
You have a warped aluminum cylinder head which can no longer clamp the cylinder head gasket to the engine block evenly.
So combustion pressure from a cylinder is getting into the water jacket, causing very high pressure, far above what the cooling system can handle.
Source(s): Mechanic - thebax2006Lv 712 months ago
A bad radiator fan can cause over heating but since you're blowing coolant out and the expansion tank already blew I'd suspect you have a bad head gasket pumping over 150 lbs.of compression pressure from the cylinders into the cooling system.
Put a used motor in the car.
Source(s): Mitsubishi Master Tech - CactiJoeLv 712 months ago
You have a warped cylinder head. When this occurs gasses from the cylinders can escape into the water jacket and increase the pressure beyond the systems ability to contain the pressure. No way around it, the head(s) have to come off, be sent to a machine shop to be restored, checked for cracks, new valve seats ground, possibly new valves, new valve seals, and the warping will be machined out of the head(s). Happens on aluminum heads more often than cast iron heads but they all eventually suffer the same fate.
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- Anonymous1 year ago
It is time to do some proper troubleshooting. Get a pressure tester and find the LEAK.
