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The BMW Range
5 Series
E34
Water Loss
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<blockquote data-quote="teejay" data-source="post: 429578" data-attributes="member: 51"><p>Hairline cracks in the expansion tank are first signs of high pressure/system leak in the whole cooling system.</p><p>Either the pressure release cap is faulty or the cooling system has delevoped leaks-hoses,connectors,gaskets,etc</p><p> </p><p>Pressure test in the cooling system would be a good start while changing the hoses and possible wear and tear parts is also a good preventive maintenance start.</p><p> </p><p>Try filling with colored coolant to see where the leaks are from, best would be just after switching off the car, try and get the high speed fan to kick-in, let it cool abit, switch off the engine, then observe and listen for obvious hissing all round, if you can go under the car after inspecting the engine bay, could be the last resort as coolant hoses do run through back of some engines.</p><p> </p><p>Worn headgaskets could also be a coolant sucker, check engine oil filler cap for brown sludge like substances, if present, then worn headgaskets is the culprit and time for a top overhaul.</p></blockquote><p></p>
[QUOTE="teejay, post: 429578, member: 51"] Hairline cracks in the expansion tank are first signs of high pressure/system leak in the whole cooling system. Either the pressure release cap is faulty or the cooling system has delevoped leaks-hoses,connectors,gaskets,etc Pressure test in the cooling system would be a good start while changing the hoses and possible wear and tear parts is also a good preventive maintenance start. Try filling with colored coolant to see where the leaks are from, best would be just after switching off the car, try and get the high speed fan to kick-in, let it cool abit, switch off the engine, then observe and listen for obvious hissing all round, if you can go under the car after inspecting the engine bay, could be the last resort as coolant hoses do run through back of some engines. Worn headgaskets could also be a coolant sucker, check engine oil filler cap for brown sludge like substances, if present, then worn headgaskets is the culprit and time for a top overhaul. [/QUOTE]
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Water Loss
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