Hi Guys -
Dumb question of the day - where is the drain plug for the block located on an M103? Car is a 1990 300SEL. I'm having higher than normal temps and want to do a system flush.
The temp at 60-65 mph runs 90-95 degrees ( used to be 80-85). When I slow to 30-35 mph temp goes to 100-105. When I set at a stop light the temp goes to 110-115. It got to 120 once. I can hear the aux fans come on around 105 but the temp still climbs.
I've had the car for a year and a half and don't have any idea when a flush was last done. I want to flush the system, replace the thermostat, and put in new antifreeze (G-05) to make sure all that is correct.
Any other suggestions and comments would be greatly appreciated. This is my baby and I worry when it has a fever.
Thanks in advance for your help - Ken

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1990 300 SEL