1990 560sel when the ac is on on at idle the temp rides up to 90C the aux fans won't come on. is a fuse or electrical connection?

Probably low on freon.

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Try 2K rpm w/ac on.
If still no fan, jumper red switch with pigtail wires on the side of drier/reciever, key on...
Report findings............

why would low freon have anything to do with the aux fans coming on? the air blows cold. the engine temp is only riding high when it is very hot outside. the jumper switch from what to the drier?

<< Join Date: Aug 2006
Posts: 155

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What do you think triggers the fan??? The pressure on the high side of the a/c system..sooooo, if you are low on refrig., you are too low on pressure to trigger the fan sw on the drier.........................

Go here and read post #13
http://www.peachparts.com/shopforum/showthread.php?p=1525184#post1525184

Also, what is the ambient air temp? If it's too cold to produce sufficient high side pressure (in conjunction with low freon), the fan may not be triggered normally.

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ambiant air temp when it happened was 87 outside, typical arkansas weather

Have you jumpered the high side aux fan switch yet??