Date registered: Nov 2005
Vehicle: '83 W123 200 '98 E200 Kompressor (both Euro-spec., 200 in Portugal, E200 Now in Canada!), '08 B200
Location: Toronto, Canada
Mentioned: 3 Post(s)
Quoted: 133 Post(s)
Agree on the thermostat. The engine should warm up within about 10 minutes of driving. Should hover between 80 and 90 Celsius, a little higher in stop and go traffic in the summer or depending on your climate.
Yes, the system is filled via the reservoir. The reservoir is pressurized when the coolant warms up.
You already know about the drain from the other thread. Drain. If you want to flush the system, put the drain back on, fill it up with water (mixed with a flushing solution if you like - that is safe for aluminum and plastic), run for 15 minutes (or according to flushing solution instructions), then drain again, then fill with a 50/50 mix of the M-B approved coolant and DISTILLED water. I mix the coolant and water by pouring a bottle of each into a pail, then back into the bottles. That way the mix is perfect, even when you don't know how much the system will take.
There are always air pockets, so after filling the system, warm up the engine with the coolant reservoir cap off, and keep refilling. The reservoir should end up half full (at the top of the black portion). Put reservoir cap back on, then drive as usual. You may get the low coolant light for two to three days, even when you think all the air is gone. Just pull over and refill (have your mixes solution handy).
Obviously, if doing the thermostat, do it first since you loose coolant anyway. It's below and to the back of the air filter box, so you have to remove that. There are threads around here.
Paul (Paulo Santos)
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'83 W123 200, '98 W210 E200K, '08 W245 B200
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