right ive just put a new radiator and thermostat in my 318i m40 as it had an overheating problem, but it doesnt seem to want to bleed, ive used the bleeder on the thermostat housing, but ive been told i need to use another one on top of the engine near the inlet manifold, but i cant seem to find it, can someone please show me where it is
cheers
James
bleeding coolant... help
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jamesroools
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anyone, really need help with this 
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Brianmoooore
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I don't know of any second bleed on an M40.
One on the radiator and one on the thermostat elbow.
Never had to do it on a M40, but on a M20 often have to partly pull off the top heater hose to release air trapped there.
One on the radiator and one on the thermostat elbow.
Never had to do it on a M40, but on a M20 often have to partly pull off the top heater hose to release air trapped there.
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Martinaston
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James i offered you lots of different options before on the problems with your car and you appeared to be quite up to speed on the terminology but then you dumbfounded me by admitting that you did not even know how to bleed the cooling system.
So i will try again in the hope that this time you will take thing's one step at a time.
The M40 engine does not have a bleed screw on the thermostat housing or anywhere on the engine.
The bleed screw for that system is on the radiator next to the filler cap.
The best way to bleed the system is to put the internal heater setting to hot and totally remove the screw and fill the radiator, then start the engine and continue to fill the rad as the coolant is drawn into the engine.
Once the level stops dropping put the screw back in and rev the engine slightly with the filler cap still off.
When you are sure the water level has stopped dropping put the filler cap back on and let the engine run for a while to build up a bit of pressure (keep an eye on the temp guage just in case).
Then with the engine still running, unscrew the bleed screw to release any air locks and then tighten it once you get no more bubbles coming out.
After that take the car for a drive to get the engine to working temperature and get the revs up over half way for a while to get the coolant circulating (still watching the temp guage and the heater set to hot) then pull over and bleed it again to be sure you have all the air out and that should be it.
Just remember to keep an eye on the guage for the firsrt few days and don't worry about the fan for now they have to be completly bollocks'ed before the car overheats.
So i will try again in the hope that this time you will take thing's one step at a time.
The M40 engine does not have a bleed screw on the thermostat housing or anywhere on the engine.
The bleed screw for that system is on the radiator next to the filler cap.
The best way to bleed the system is to put the internal heater setting to hot and totally remove the screw and fill the radiator, then start the engine and continue to fill the rad as the coolant is drawn into the engine.
Once the level stops dropping put the screw back in and rev the engine slightly with the filler cap still off.
When you are sure the water level has stopped dropping put the filler cap back on and let the engine run for a while to build up a bit of pressure (keep an eye on the temp guage just in case).
Then with the engine still running, unscrew the bleed screw to release any air locks and then tighten it once you get no more bubbles coming out.
After that take the car for a drive to get the engine to working temperature and get the revs up over half way for a while to get the coolant circulating (still watching the temp guage and the heater set to hot) then pull over and bleed it again to be sure you have all the air out and that should be it.
Just remember to keep an eye on the guage for the firsrt few days and don't worry about the fan for now they have to be completly bollocks'ed before the car overheats.
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Brianmoooore
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Was just going to post back, saying a M40 DOES have a bleed screw on the thermostat elbow, but I've just been out to the workshop to check.
I did a cambelt on a M40 last weekend,and was sure that there was a bleed screw in front of me all the time - and there is, on this 1990 touring.
But there is an 88 M40 engine also in the workshop, and that doesn't have the bleed screw.
I did a cambelt on a M40 last weekend,and was sure that there was a bleed screw in front of me all the time - and there is, on this 1990 touring.
But there is an 88 M40 engine also in the workshop, and that doesn't have the bleed screw.
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Martinaston
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OOPS 
Spot on again Brian.
Not sure what one i had then
Anyway sorry James.
The best advice i can give you is to ignore my last post and listen to Brian or buy the Haynes book.
I'm going to finnish my humble pie now and go to bed.
Spot on again Brian.
Not sure what one i had then
Anyway sorry James.
The best advice i can give you is to ignore my last post and listen to Brian or buy the Haynes book.
I'm going to finnish my humble pie now and go to bed.
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Wilson
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Martinaston wrote:I'm going to finnish my humble pie now and go to bed.
Dont you just hate it when that happens!!!!! 
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Brianmoooore
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A week ago I would have agreed with you. I have another M40 as well, and that doesn't have the bleed screw either.Martinaston wrote:OOPS
Spot on again Brian.
Not sure what one i had then
Just coincidence that I spent an hour or so last weekend looking straight at it on the '90 one!