PeachParts Mercedes-Benz Forum - View Single Post - Mercedes 126 -V8 -What temp is Overheat?

G-Benz · #12 01-11-2002, 03:59 PM

Two more things:

What is your coolant/water concentration? should be 50/50 or 60/40 (or 40/60)...too much water inhibits the boiling (and freezing) point. Too much coolant, and the heat dispersion properties are reduced.

There may be air in the system. Make sure the thermostat does indeed work, and that it is installed so that the bleed hole in at the highest position on the horizontal plane (so that any trapped air can be forced out).

Again the aux fans turn on based on the 117C temp or A/C pressure...so the fans CAN turn on at a lower temp than 117C if the A/C system pressure demands it.

The aux fan sensor is about $30, and is cheap insurance, as we are now watching you throw parts at the problem. I do understand!

My W124 gets 100C temps on really hot Texas summer days (100+F outside), and even 105C when sitting in stop and go traffic under the same conditions. My SL however hits 100C easily during a warm Texas evening. The ML stays at 85C all of the time...go figure. SO I don't know what is "normal" for a 126...