I am a new member , i have a 2000 528i ... Nice car but been having some cooling system issues and i am hoping to find my problem by looking on here and getting proper advice.. I am glad to be a part of this site too..
Thanks Brettski, no right now it's the water pump leaking , but before i was having problems with it getting hot all the time as i was at a stop light or in line somewhere.. I have the new one coming this week but , i want to know a better way to bleed the system when the new water pump is installed to make sure i have no air pockets.. and they say to use bmw antifreeze , is there a difference if you don't use it?
I am not sure about the Anti Freeze, I'd be inclined to use it, but there are more knowledgable members than me.
As far as bleeding the air out of the cooling system goes:
Fill it as much as you can by removing the top hose from the radiator and pooring coolant in until its full, if possible do this with the front wheels higher than the back, on wheel ramps or inclined driveway etc.
Reconnect the hose, fill the expansion bottle and then start the car, put the heater on max and then rev the engine (1500 - 2000 RPM) to move the coolant around. If you are getting hot air out of the heater then apparently you are on the right track, if you aren't, then check if there is coolant entering the expansion bottle from the hose that runs across the top of the radiator from the left side of the radiator to the expansion bottle, if there isn't, check if there is a kink in that hose that will stop coolant and air from bleeding across, and progressively purging the air. Even if you do get the heater working properly, apparently it can take 3 - 5 hot-cold engine cycles to complete the process, so keep an eye on your coolant level in the expansion bottle.
Welcome. I too own a 2000 528i and have plenty of experience with the good and the occasional bad. Cooling issues are common on the E39's. The radiators suck, the water pump sucks, and the thermostat sucks. Most of these items need to be replaced before they fail with something that is upgraded. Most commonly the water pump is the issue and most overlooked part as the impeller in the waterpump is actually made from a plastic resin.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.