Overheating

1996 BMW 3 Series 1.6ise
Car: BMW 3 Series
Year: 1996
Variant: 1.6ise
Categories: Leaks & Noises
hi all my bm has started overheating,ive changed the warter pump and the viscouse fan and ive taken the thermostat out,ive bled the system a million times,ive striped the top end of the engin eg the injection system so i could get to the the hoses at the back of the engin to see if there where any blockajes,and there where none,i dont have any milky residue under the oil cap and im not leaking warter,the outher dayb i drove the car for about 45 min and the temp suddenley went to red,i started to pull over and the temp went back down to half way again,so i carried on driving,anouther ten min driving and the temp went up again i checked the engin and the top hose was nearley solid and red hot this happens all the time now if i let the car run for half hr eventuely the top hose will presurise and the temp will go up but sometimes the temp will drop on its own please help!!!
Problem added: Aug 26, 2008 (15 years ago)
hi there, i suspect you engine is drawing air from itself and causing air locks. this is very common. usually its the head gasket at fault but do pay attention to the radiator if it is hot in relation to the top and bottom hoses. also if the heater blows really hot air then goes tepid. also if prolonged use of the engine in this condition, could cause the head to crack. this too can and will cause the cooling systen to pressurise. the first thing to do with this problem is to peform a cobustion leak test. more often than not it's the head/gasket problem. hope this helps!!!
Answered Oct 27, 2008 (15 years ago)

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