Late model Mercedes 300SDL

diesel
overheating

#1

This vehicle has been completely rebuilt, when I take it out and hit 70 mpg it overheats, what could be the cause?


#2

It only overhears at high speeds? Does it have an electric fan or a clutch fan?


#3

Late model? Are we talking about a '86-'87 300SDL or a '90-'91 350SDL?

Has it been overheating since it was rebuilt, or is this something that developed later? Does it ever overheat at lower speeds?


#4

How old is the car and why was it completely rebuilt? Who did the rebuild?