1985 Other BMW Models cooling

1985 BMW
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NICHOXLAS
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Engine Cooling problem
1985 Other BMW Models 6 cyl Wheel Drive Type unknown Automatic 140 miles
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My 635 csi bmw drives for about 20 minutes, but then over heats and shoots all the coolant out of the reservoir. i just changed the thermostat and the water pump isnt too old. what else could it be?
Mar 27, 2008 at 4:31 PM
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RASMATAZ
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Try bleeding the cooling system don't work do the tests below.

Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.

Pressure test: do not do a pressure test if there's leakage at the headgasket this might cause coolant into the cylinders and lock it up or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.

If the block and pressure test passes check the following: Thermostat,Pressure test the Rad. cap,Clogged radiator,Fan clutch,Radiator electrical fan,collaspe hoses,water pump.
Mar 27, 2008 at 6:07 PM