Question about 1995 BMW 5 Series

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HOW DO YOU PURGE OR RELEASE AIR ONCE YOU REPLACE RADIATOR, WATER PUMP AND THERMOSTAT?

REPLACED RADIATOR, WATER PUMP, AND THERMOSTAT STILL RUNNING HOT.

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Let the engine cooldown,then open the bleed screw on on the thermostat house,do not remove just loosen----fill water in the radiator bottle slowly and watch for water coming out of the bleed screw----
sometimes the bleed screw is blocked due to anti-freeze-then take the screw off completely ,clean and replace----always make sure the engine is cool

Posted on Jun 15, 2009

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The thermostat (on bmw replacement parts) have an arrow that has to be installed facing upward.if this was done correctly,to bleed the system usually there is a bleeder screw on or near the expansion tank(where you fill the coolant) and possibly on the thermostat housing. i would recommend opening both bleeders and keep filling the system with coolant closing the lower bleeder first and then allow the rest of the air purge from the other bleeder screw.make sure the coolant stays full and be patient you can't wait TOO long.

Posted on May 03, 2009

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Try bypassing the heater core if overheating stops u got a bad core

Posted on Nov 22, 2011

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Posted on Jan 02, 2017

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I have a 1996 ford ranger with a 3.0. It started to get hot. I replaced the thermostat. And purged the air from the system. It was still running hot. So I replaced water pump. And purged again.


Define hot? The gauge in the dash is not that reliable. You should use some other thermometer to check the temps. Also the condition of the inside of the radiator can be a cause of this.

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There are other things to test before we have the engine spread all over the yard. Cooling fan operation. Yes the thermostat hot air in heater just means hot water. start with a cold engine then start and run at a high idle if heats quickly upper radiator hose hot lower cold good but reverse no flow. remove and test thermostat (not replace) put on stove boil water and watch it open once center piece is moving check with thermometer it should agree with stamp number on thermostat. if good check for slipping fan belt. check for air restrictions on radiator and water flow.

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Coolant system have bleed points. There is air in your system that needs to be purged out through the purge valves.. There maybe a few. You have to slightly open them when you first fill the system and let the coolant circulate till a little bit of coolant comes from bleed valves then you close them. Letting the system purge air by leaving the radiator cap open is not enough. Are you sure you put the correct temperature thermostat in , and facing the correct way?

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