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Old 05-22-2002, 09:58 PM
pmizell's Avatar
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
Sixto described how to drain all of your cooling system...

... now when refilling, you want to make sure no air bubbles form. So, to avoid this, remove this bleed screw (14mm) shown in pic before starting to refill with your Valvoline MaxLife (should be OK). When the antifreeze begins to overflow from this hole,(on my 91 300E, after about a gallon and half) put screw back in and fill until plastic expansion tank (one with radiator cap on it) is about half full. Voila! You're done.

Good luck!


'91 300E, 212K miles
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Old 05-22-2002, 11:06 PM
Mike Murrell's Avatar
Registered User
Join Date: Feb 2000
Posts: 2,141
Your car has a drain plug in the FRONT of the radiator and it might actually be accessible. In many cases, it's easiest to drain the radiator by simply removing the hose that's connected to the bottom corner(passenger) side of the radiator. This hose is about 1.25 to 1.50 in. in dia.

Lots of good info in front of this post(Sixto-Pmizell)
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC

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