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Old 09-10-2007, 08:36 AM
A264172 A264172 is offline
Ta ra ra boom de ay
 
Join Date: Jun 2004
Location: Pittsburgh
Posts: 1,915
That's fairly normal... but you may have a bad viscious fan clutch.

When the temps get up over 100-110 pull over to a safe spoot, turn off the engine and pop the hood. If the fan between the rad and the engine block spins freely (it should have some resistance at that temp) your fan clutch may have leaked out the its hydraulic fluid. A partly plugged radiator or a missing fan shroud can also cause the fan clutch not to engage. It can be refurbished by a method described on this forum or replaced... but you are probably not harming the car driving it in this way, as long as the auxiliary fan kicks in before the temp gets into the red zone and brings it back down the system is working within the range it was designed for.
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-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13
http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14
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