Question about 1990 BMW 7 Series
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Posted on Jan 02, 2017
SOURCE: 2000 BWM 528i coolant leak
The 2000 BMW uses a non silica based coolant. OK to use a silica free coolant. Dex-cool is the same. Just make sure it is SILICA free.
Silica based freon supposedly decreases the life span of the coolant system.
Posted on Aug 06, 2008
Perform a liquid block test (with the bottle of fluid over the radiator mouth.) If the blue liquid turns yellow or clear, you have hydrocarbons entering the cooling system (usually via head gskt.) If not, you have ruled out a costly repair.
Sounds like it overheats pretty easily, without t-stat! This block testing liquid is cheap, and will verify a suspected leaking head gasket without lengthy diagnosis. Hope it's better news, but good luck!
Posted on Jan 28, 2009
Pressure test cooling system to determine origin of leak. Radiator and coolant reservoirs are common problems. Vehicle is very difficult to purge air from cooling system and may take multiple times of idling until thermostat opens. Sometimes help to rev engine to about 2500 rpm 5-8 times to help build heat and move coolant through system. Must have heater on while performing this task.
Posted on Mar 29, 2009
have you replaced the bleeder screws? and the expansion tank cap they both have O-rings that compress and will fail over time also check the hose at the top of the exp tank it also has o-rings inside it
Posted on Apr 03, 2009
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