Question about 1999 BMW 5 Series

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I bought a UK spec E39 528i last year with an over heating problem (new head had been fitted)but still over heating.I bleed the water system and drove home just short of a 100 miles with no problem.Next day I drove a short distance,when she over heated,got here home ;et her cool down.Read up on bleeding,got the car front end up as far as possible. Still no luck,changed thermostat water-pump,then discovered the bottle on the side of the rad was leaking so I bought a new one,3 rad's later I decided the head had gone again,striped down and head checked,all OK.On refitting the head we discovered that the threads in the block had been helie coiled .Cut a long story short I ending up buying a 2nd user engine Fitted this and she starts on the button.but the same problem she's still over heating,and chucking out water and the pressure is building up in pipes as soon as we put the rad cap on,I've tried bleeding this car so many times its not funny,on one web forum it suggesting bleeding this back wards through the heater matrix that been tried today.less water coming out of the rad,no smoke out of the engine,spark plugs are dry.I've worked on BMW before,and toyota Estima's which are which are prone to over heating but this is getting beyond a joke.

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Remove the colas and repair or change it because the colas is not straight that's while there's pressure in pipes and inside water system .. the CO2 is going to mixed with water

Posted on Mar 19, 2011

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Did you bleed the cooling system? and check operation of the thermostat, which should have been done after fitting radiator before finishing by putting on radiator cap.
If not remove radiator cap when cold get vehicle warm and check thermostat operation, while bleeding any air pockets in cooling system and if no flow and bubbles or it starts to boil (shooting water) out of radiator the thermostat could be jammed or head gasket blown.
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Do you turn on the key and turn up the heater so the heater valve opens when you are bleeding it? I run mine up on ramps so the bleed point is higher than the heater valve when I bleed them. The book does not say to do that so I don't know if it helps at all.

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These are some of the common problems as your car is reasonable new i would't think the head gasket has gone it is more then likely what you say that the water pump is broke probably the impaler has broken off. To bleed the system you need to get it up to running temperature and remove the bleed screws in the cooling system starting from the highest one working down then back up. If you find it is hard to bleed and no coolant is being pushed out it is more then likely that the water pump has gone. To test if the head gasket has gone take off the oil cap and look for a mayo type gunk around it if there is then this means that water is getting into the oil system meaning the head gasket has gone another test is to use a spacial liquid that test for exhaust gases in the coolant system.

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My 2000 Montana does not blow out heat. A month after we bought the van we realized there was no heat. After a while it started over heating. We replaced the thermostat and fixed the cracked head gasket...


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