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  #1  
Old 08-29-2017, 10:58 PM
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Join Date: Jul 2017
Posts: 2
Mercedes Benz 1991 300SL-Help with coolant flush and thermostat replacement

Hey all,
After a long time of searching the forum with no luck, I had to post a new thread as I need some help to preform a coolant flush to my 91' 300SL-24.
I would like to change the coolant since I do not know how old is it and summer can get quite hot here now days.
in addition to the coolant flush , I would also like to change the thermostat, the thermostat housing and the pressure cap of course.
How should I start with the flush? , at what phase of the coolant change should I change the thermostat?. What type of coolant should I use? , how much coolant should I use the refill the system? Finally, How should I bleed the system? I noticed a bleeder cap on the thermostat housing.

Thank You
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  #2  
Old 08-30-2017, 02:29 AM
Daantjie
 
Join Date: Nov 2014
Location: Vancouver, BC, Canada
Posts: 84
Zerex G-05 in 50/50 dilution with distilled water is what you want to use.
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  #3  
Old 08-31-2017, 12:50 AM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,469
I would start with this:

Mercedes-Benz W124 Coolant Flush and Replacement | 1986-1995 E-Class | Pelican Parts DIY Maintenance Article

Using google try:

M104 Coolant flush

and

300SL coolant flush

The Zerex G-05 suggestion is good.
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