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Overheating Problem Need Advice
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<blockquote data-quote="zidee" data-source="post: 424138" data-attributes="member: 20151"><p>Hi,</p><p></p><p>I'm about to decide to get a year 2000 E39 525 with M54B25 engine. Loan approved but before I finalise the purchase i decided to take the car to mechanic to do diagnostic check. After the diagnostic only one error discovered. Parking Distance sensor not working (can it be easily repaired?). Anyway that does not deprive me from taking this car. However on the way back from workshop, during heavy rain and jam, the temperature shoot up to 3/4.When cruising, temperature back to normal. When rev the engine high in neutral gear, temperature back to normal (half). When idling or stop temperature back to 3/4 and at one time almost hit the red zone. </p><p></p><p>This really scares me as I've gone through radiator lower hose burst before on my previous E34 during traffic jam. Even after fixing the problem, radiator have to top up from time to time. I decided to let go the car.</p><p></p><p>My worst nightmare is head gasket crack.</p><p></p><p>What could go wrong?</p><p></p><p>Fan clutch? I notice aircond takes time to cold when start the engine. Salesman said this is normal for BMW. Is it so?</p><p></p><p>How about water pump? Is it not working properly that cause the problem?</p><p></p><p>Salesman said he will fix all those problem. I told him after all the fix, I want to do compression test to make sure head gasket not warp or crack. Where can I do compression test? How much will it cost should engine require top overhaul?</p><p></p><p>Final question....should I walk away from this car. Such a beautiful machine to drive with very responsive throttle and comfortable. </p><p></p><p>Appreciate any advise.</p></blockquote><p></p>
[QUOTE="zidee, post: 424138, member: 20151"] Hi, I'm about to decide to get a year 2000 E39 525 with M54B25 engine. Loan approved but before I finalise the purchase i decided to take the car to mechanic to do diagnostic check. After the diagnostic only one error discovered. Parking Distance sensor not working (can it be easily repaired?). Anyway that does not deprive me from taking this car. However on the way back from workshop, during heavy rain and jam, the temperature shoot up to 3/4.When cruising, temperature back to normal. When rev the engine high in neutral gear, temperature back to normal (half). When idling or stop temperature back to 3/4 and at one time almost hit the red zone. This really scares me as I've gone through radiator lower hose burst before on my previous E34 during traffic jam. Even after fixing the problem, radiator have to top up from time to time. I decided to let go the car. My worst nightmare is head gasket crack. What could go wrong? Fan clutch? I notice aircond takes time to cold when start the engine. Salesman said this is normal for BMW. Is it so? How about water pump? Is it not working properly that cause the problem? Salesman said he will fix all those problem. I told him after all the fix, I want to do compression test to make sure head gasket not warp or crack. Where can I do compression test? How much will it cost should engine require top overhaul? Final question....should I walk away from this car. Such a beautiful machine to drive with very responsive throttle and comfortable. Appreciate any advise. [/QUOTE]
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