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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-20-2012, 06:35 AM   #21
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My Ride: '99 328i 300K miles
I don't know which expansion tank hose you got, but if it's the one connected to hard pipe, I'd honestly say that you'd be fine just taking the o-ring and spacer out from the new hose, using them in the old hose...and then, when you're ready to get to those other hoses, just find a replacement o-ring...you'll have plenty of time for that. (If this hose goes back to the water valve, then go ahead and replace it...it's easy to do that one...or the ones going to heater core (forget which goes where).

You should spin your pulleys when belt is off...if they free spin like a skateboard, you should get to them now...both tensioner pulleys, and the idler. Very easy to do when fan is out. One bolt each. (T-50 bit needed or some hex head)

Get the IAT 0-ring for temp sensor if not replacing...as I said.

We didn't cover OE coolant and distilled...and me? I'd buy at least 6 gallons of distilled. After your work, refill with just water...run until you know you're good and leak free. Do test drives close to your home so you can get back when you get to op temp...and fix things again if needed.

Then drain that water...and if it's dirty...fill again with just distilled....drive, let cool down, then drain again.

Then fill with coolant (straight this time)...and fill up the rest with distilled. (You'll have some plain water held up in system, and if you pre-mix 50/50, you won't get it all in and that will lower your ratio a bit. In some climates it might make a small difference.

Technically our system takes 8.9 qts. so technically you need to get a gallon and 1 qt (now available) of coolant...though those two extra cups aren't going to make a huge difference...I won't tell anyone! Get as close to 50/50 as you can.

When you bleed after a full drain...pour coolant in very slowly (according to all instructions...with heater on, car off...etc...) and for this bleeding only, you'll end up pouring all the way up to the top of the ET's filler neck...coolant won't otherwise come out of the bleeder screw. You will have extra coolant/water to go in at this point...after your first drive, you might need to add another couple of cups...then maybe an ounce or two a couple of other times. Monitor level until you're stable...and check it monthly without fail (is my advice)!

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