Major Contributor
Bleeding the M30, did I loose my touch?
I must have bleed something like 10 E34s.
I never had a problem.
Removed the coolant from the radiator and the engine block.
Put all the plugs back
REmove the bleed screw.
Poor the coolant slowly until it runs out of the bleed screw hole.
Put the bleed screw back and add more coolant.
Put the cap back.
Start the car, car goes hot. Shut it down.
Open bleed screw.... no air, no bubbles. Just coolant.
Did that many times. Still no heat inside and car just overheats....
Did I miss something?
Top rad hose is not very hot. Could be thermostat I guess...
'85 Euro 635csi Race Turbo, megasquirt, Group A
'92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
'02 Subaru WRX Wagon with STI springs, bigger sway bars
Super Moderator
Did you have the heater turned on to high? Your factory manual specifies that you
turn the heater on high and have the key in the on position while bleeding with the engine off, I also remove the plug next to the temp. sender and the ecu temp sensor... They have that third plug, I remove that one and fill it with coolant from there to try and get rid of and air trapped in the block...
Originally Posted by Bruno
Major Contributor
YEah I remember something about pooring coolant in the 3rd hole...
I will try that tomorrow.
I didn't know about letting the key in ignition while bleeding.
I will try that... else, might be something else ARG.
Funny that all the other M30 I have done never has this problem...
Thanks Bill.
'85 Euro 635csi Race Turbo, megasquirt, Group A
'92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
'02 Subaru WRX Wagon with STI springs, bigger sway bars
Super Moderator
Key in ignition and heater on high. I guess when you have the key on and the
heater set to high it makes the auxillary pump run, which helps to get out any trapped air bubbles in the block or the head...
Major Contributor
Big thanks Bill, I will put it to the test tomorrow.
'85 Euro 635csi Race Turbo, megasquirt, Group A
'92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
'02 Subaru WRX Wagon with STI springs, bigger sway bars
Major Contributor
When did BMW start using aux pumps ? I know a lot of v8 540 and 740 have them. Wasn't under the impression they were used on m30 e34.
Derek A.
90 535i 5 Speed - Style 5 17"
Super Moderator
They've been on all m30 e34's since the e34 first came out.
also m20 since 1989
Major Contributor
Well I've got an early 1990 M20 2 litre and it hasn't got the aux. pump. Luckily no cooling problems!!!
Cheers,
Shaun
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