Question about 1985 BMW 3 Series

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How do you vent thermostat on 325E (1985)? I replaced my upper radiator hose and I have a feeling thermostat will not open. Thanks for input on this matter.

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There should be 2 bleeder screws in the system, one on the expansion tank, and one on a thermostat housing. Open both screws all the way. Turn the key to the On postion (but dont start the car). Then turn the heater to max heat, but have the fan set at the lowest setting. Fill the expansion tank til coolant comes out of both bleeder screws with no bubbles. After that close the screws (be very careful not to over tighten them!!). Then completly fill the expansion tank. (dont mind the full mark, if theres air in the system, it will drop the level in the expansion tank) And thats it. Drive the car around then check the level.

Posted on Mar 12, 2009


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start a cold engine and let it idle . After about 10 minutes you will feel that the top radiator starts to get hot. This indicates that the thermostat is opening and allowing hot coolant through to the radiator. This means that the thermostat was replaced . Point of interest here . Water pumps no not cause over heating. They will have seal and bearing failure but other than that they never cause overheating unless they are 50 years old and rusted away at the impeller. A new pump will be shiny clean.

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Be sure the radiator is full of coolant, Start the engine when cold, while engine is running feel the top radiator hose. As the engine warms up the upper radiator hose will suddenly get hot when the thermostat opens. If the upper hose stays cool, the thermostat may be stuck closed. If thermostat is stuck closed It must be replaced.

Without knowing more about your car, this is all I can recommend.

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I don't mean to sound insulting at all but I'm not certain what your experience is with engines.
Is it possible you put the thermostat in upside down?
Do you feel pressure on the top hose when you squeeze it? Does it feel pressurized? If so then the water pump is doing it's job.
Easiest way I have seen to "burp" a system after doing a coolant change or thermostat swap is to get one of the radiator caps that has a vent lever built into the top of it. This way once the engine is hot you can slightly pull that lever up and let it vent out the air a little bit at a time. Another way would be to to leave the radiator cap off. Start the engine and squeeze the bottom hose to burp the air to the top of the system. Hope this helps.

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To check the thermostat, leave the radiator cap off, turn heater controls to high heat, and start the engine and run it till at operating temperature (this is to remove air from the system.) Coolant level should drop a bit when the thermostat opens, so you may need to add more. Replace rad. cap when engine is warmed up.
The only way the thermostat would cause no heat is if it were stuck open. So feel the upper radiator hose as the engine warms up. It will be cold or cool till engine starts to warm up-should take about 10-15 minutes, and then the thermostat should start opening, and the upper hose will start getting hot. If the engine takes a long time to warm up, like 30 minutes, the thermostat may be stuck open, needing replacement. If all seems good, check the actuator doors (temperature blend door) on the heater case. The doors have to open properly to let air from the blower motor to pass across the heater core, and then out the vents.
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I have a golf 5 2005 and the temp gauge will rise to 90 which is normal then return back to the resting position, i am not losing water. is this a sensor problem. thanks

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follow the upper radiator hose to the engine, remove that hose at the engine and u will see the thermostat under the cover.

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