W126 radiator over heat 90-100
 

Hi...i need some help.My mercedes w126 280se radiator over heat is around 90 when driving on highway.first time i think maybe i turn off the a/c maybe the temperature will not going to 90c,but also the same problem.when i idle the car without the a/c the temperature will slowly increase to 100c.if i running again will slowly decrease to 90c again.Anybody can help me for this problem?Thank You

replace the radiator,it is made of plastic and aluminium,over time the tubes in the radiator will shrink and not flow enough water to maintain temperature at correct level.been there many times.

hi there,thank you.so this week i will send my car to repair.

mercw126, before you go to the expense of replacing the radiator replace the thermostat and see if that resolves your overheating problem.

The radiator will be hard to locate as it is MUCH different from the USA version radiator. It is similar to the radiator in the Pre-126 model full size cars and may even interchange. The Euro cars DO NOT USE a recovery bottle. The radiator is made like and old Ford from the 60's. The thermostat is likely the cause of the problem. Being this is a Federalized Euro car as I gathered from your other post, the timing may have been fiddled with to get the car to meet emission standards and could also be causing heat related issues. I would check the timing and have it set back to European specs and get rid of the Federal crap if you can legally do so. My 280SE with no emissions is real fun to drive. Actually second guessing selling it it is so much fun.

Good luck,
Aaron

If the temperature changes with engine speed check the coolant level and make sure that you burp the system before trying other fixes.

To burp the system, park it with the front facing uphill, open the filler cap, turn on the defroster and rev the engine up to 3000 RPM a few times...

Hi there,the radiator and thermostat is no problem.The car temperature changes with engine speed if i driving fast temperature will decrease until 80.if i stop the temperature will increase until 90-100

Hi there,the radiator and thermostat is no problem.The car temperature changes with engine speed if i driving fast temperature will decrease until 80.if i stop the temperature will increase until 90-100

Sounds like low coolant to me....Did you check it?

hi luvmbdiesels...are you on the line now?may i have you msn messenger e-mail.so i can ask you directly?

Dontcha love it when people want a diagnosis but won't check ANYTHING?

-tp