Question about 1986 BMW L7

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Engine overheated Hi, i have replaced the thermostat and housing on me 728i which overheated and i had to get towed home. I cannot stop it overheating after i have gone a couple of miles. Can anyone suggest anything as i have not got a manual to work with.

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Hi Gordon.

Are you sure the coolant is circulating ?

1. Check the Water Pump !

2. Pressure test cooling system for leaks.

3. Carry out carbon monoxide test on cooling system , if liquid changes color, you have possible blown head gasket.

If you do this, you should get to the bottom of the problem.

Good Luck !

A FIxYa rating would be greatly appreciated Please !


Posted on Feb 09, 2009

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Hello, There are many things that can cause this problem. It could be anything from a blown head gasket to a water pump. If you want to eliminate the water pump, take the thermostat back out and leave out, start motor, and see if you have a good coolant flow from water pump. Also, ck your fan clutch. This won't necessarily cause it to overheat at road speed but at slow speed or idle it could. There is also the possibility that your radiator is stopped up. There is something else, although rare, I have seen happen. Check the small coolant return hose at the radiator to make sure something hasn't blocked the small plastic nipple. If this is blocked, coolant will not circulate.
Check your engine oil for any kinds of water contamination, check your plugs for water, if you have access to a coolant pressure tester, pressurize cooling system, remove spark plugs, let stand for at least an hour, then turn engine over and see if any coolant comes out. This may give you an indication that your head gasket is blown.
I hope this helps.
CYA, Gator241

Posted on Feb 09, 2009

  • Wally Wicker Feb 09, 2009

    Hello again, If you find this information to be correct would you please enter a "fixya" rating.

    Thanks, Gator241



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