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Old 07-25-2001, 02:35 PM
DBarrybish
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Any information on 1972 280SE overheating problems? Is the axillary fan just for the AC? I've re-cored the radiator, replaced the thermostate, pressure checked everything and it still overheats. Any suggestions?
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Old 07-25-2001, 04:08 PM
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My Dad still has his 71 280SE...how do you like yours?

Sorry for going off on another tangent...I'm fighting with overheating on my 300E as we speak.

All I know is that I can keep temps under control if I DON'T turn on the A/C. It's HOT in Texas, so that is really not an option, but at least I can rule out some things.

Other things to look at is the radiator cap, coolant mix ratio, or air in the system (not likely unless you just did a flush and refill recently). You just had your radiator re-cored, so you can rule out dirt in the cooling fins. Check the ones for the A/C radiator, just to make sure.

As with you, I haven't found anything in the Haynes manual that specifically states whether or not the aux fans work exclusively for the A/C or not. But like you, I've started pointing the finger at the temp sensor (also it's the only part of the cooling system that I haven't replaced). If you unclip the wire from the sensor, the fans should run at max speed.

I'm still testing the system to see what gets the fans going...
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