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How do you drain coolant in 91 735i bmw. car manuel doesnt say how to drain coolant. is there a valve somewhere?

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There shud b a bleed nipple on the lower ov the coolent tank

Posted on Oct 06, 2009


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I have a bmw 318ci on a y plate. Several months ago my coolant light came on so I changed my exspansion tank , thermostat , coolant switch , water pump , top hose then a valve at the back of the head and...

Depending on mileage thats quite a bit of coolant loss. You seemed to have covered most areas. I think its probably something really simple like a bad hose somewhere in the coolant system. The car is nearly 20 years old and hoses degrade over time. Also I have come across a hose that was leaking, but not on the joining point, but through the actual body of the hose, it was porous with no exterior damage. Another quick thought, heater matrix?

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Started overheating one day when idling, but hit the gas and temp went back down. now overheats within 5 minutes and doesnt go back down. coolant seems to disappear slowly, coolant in radiator is bubbly,...

Sounds like you have a leak somewhere. A good place to check first is the heater core. It is on the passenger side under the dash. Check the floor carpet and under the carpet if it is wet or any signs of antifreeze. If so than your heater core is leaking, and since you don't have heat it is of course broken. This could also the the reason why you have bubbly coolant, with air leaking into the system.

I would start with that.

Good Luck! :)

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