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Message: <blockquote data-quote="valkryie" data-source="post: 3972" data-attributes="member: 2023"><p>Hi Guys,Need some advice on my E46 N42 @ 70K kms. My coolant warning light comes on for 5 seconds and then goes away. This problem has been happenning for more than half a year and it happens intermittently when the car is going fast on the highways. Check the water level the next morning with engine cold. The dipstick in sticking up and water can be seen clearly in the neck of the expansion tank. Already did 4 checks with 4 different mechanics but none can convince me that they have nailed the problem down. All 4 mechanics did high pressure test but did not find any leaks. AB (the 1st shop) did a check in the morning and found no leak but in the next morning (left the car overnight with them) did another check and told me the expansion tank is leaking and want to charge me RM 700 but I don't believe them. Water is still in my tank. The last 3 shops did a pressure test on a hot engine. 2nd shop change my cap and put in a new bottle coolant. 3rd and 4th shop recommend replacing expansion tank.I am in the opinion that changing the expansion tank will not solve this problem if the current tank is not leaking and there is enough water in the tank.  What could the problem be? How does the OBC know that the coolant level is low? It seems there is no electrical connection to the expansion tank other than a thermostat but I could be wrong. Thanks for the input.</p></blockquote><p></p>

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