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07 E350, 98 E320, 95 525IT BMW, 87 325IS BMW
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how do i drain and refill the cooling system on my 98 E320? WILL I HAVE TO BLEED THE SYSTEM AFTER REFILLING? BLEEDING IS A MUST ON MY 525I BMW. THANKS FOR THE FEED BACK.
 

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Yes, you have to bleed the system of air. MBs are pretty easy to bleed vs. BMWs.... Make sure to top off the reservoir with 50/50 Coolant(Aluminum Safe Coolant ONLY), Replace cap.... Turn Engine On, Set Heater to HIGH HEAT and turn On the Windshield defroster.... Rev the Engine for about 10 minutes(1,000-1,500rpms) enough to warm up the engine a bit.... Turn Off Engine, Open Coolant Reservoir Cap SLOWLY/CAREFULLY using a cloth rag(the system is now pressurized!). Refill/Top off the reservoir to max level....Repeat procedure until all air is bled OR the coolant level doesnt decrease
 

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Gosh BMW's are easier all you have to do is turn a little screw and let it run until it starts pushing out coolant then close.

I just bought some coolant and purple ice so I will see how it does tomorrow. So I have to keep running the car and turning it off like that? Ron I am glad you brought this up.
 

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1959 220S cabriolet, 1983 240D original owner, 1999 E300 turbo diesel, 1988 560SL, 2003 SLK320
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I just changed the coolant in mine and bleeding the system wasn't necessary. I did remove the upper radiator hose though and filled through there as well as the reservoir. Make sure you use an approved coolant.

Len
'99 E300TD 75,000 miles
 
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