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Showing results for tags 'coolant leak'.
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Hi all, my 2006 540i with the N62B40TU V8 has sprung a coolant leak. I'm needing to top-up around 1L of a 50:50 BMW blue/DI water mix weekly. I got a repair shop to take a quick look under the car to see where it leaks out (it spills off near the rear of the drip tray when I turn or drive up/down an incline), but they said they couldn't really see other than it was from somewhere near the rear of the block where the transmission bolts on. I've bought a cheap borescope, removed the engine cover, air filter and throttle body, then had a poke around with the borescope around the front part of the top of the valley pan - found a potential leak in a Y splitter on one of the coolant lines leading out of the reservoir, behind where the throttle body valve sits, image below. There was some coolant on the top of the valley pan near and around the area beneath that Y fitting, but not a huge amount, nor could I see how what coolant had ponded there would eventually make its way to and drain out at the back of the engine. Has anyone else with an N62 V8 struck a leak with that Y fitting? I read they're a bit prone to premature failure. If that was the fitting that failed for you, was the coolant falling out at the back of the block for you also? I guess there is no harm replacing the leaking crappy plastic part with a bronze one as other N62 folks have done, but I'm not convinced that is the primary source of the coolant I'm losing. Cheers, Chris W, Chch
