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In Reply to: Re: Bleeding the cooling system????? posted by Chris Wallace on June 04, 2001 at 12:00:11:
Here is a modified version of the Bently manual, which is better.
Open bleed valve.
Fill coolant slowly to the brim of the overflow tank. Continue as the coolant is being poured slowly or a little at a time.
Once coolant starts coming out of bleed valve, turn car on and turn heater on full blast.
watch coolant level while car is on. If coolant needs added do the same as above with car on until the coolant comes out of bleed valve.
Put cap on and tighten bleed valve.
I replaced the heater control valve on my 95 525i yesterday. I didn't drain the cooling system for the job so afterward I decided to add coolant the then bleed the system to make up for the small amount that was lost during replacement. I followed the instructions in Bentley, but was confused.
Bentley says to fill to cold mark, loosen bleed screw then fill till coolant exits blead screw. Well I filled and filled almost to the top without any coolant exiting bleed screw.
Do I need to completely fill reservoir, to blead out all the air, then run engine and bleed again? Do I then need to drain the coolant back to the cold mark after the engine cools?
Any comments would be greatly appreciated.
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