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Old 06-04-2001, 08:16 PM
Joe VB
Posts: n/a
At what temp should the auxiliary fans come on? My 93 400E runs at slightly over 100 when the weather is warm and the a/c is on but the fans don't come on. Is this normal?
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Old 06-04-2001, 08:52 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,877
do a search

there is a fuse in there behind the regular fuse box. You have to remove some phillips head screws to remove the cover and get to it. You need to replace the blown fuse with one having a little more amperage. There is a topic in here somewhere that covers it.
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Old 06-04-2001, 11:07 PM
Registered User
Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
The aux fans should come on at 107 degrees. They are also triggered by high AC pressure regardless of coolant temp. The aux fans are really there to protect the AC compressor, not specifically for the purpose of engine cooling. For what it's worth, my 400E has always run between 90-100 degrees in summer with AC on. I think it's the nature of the beast -- a V8 stuffed into an engine bay designed for a straight-6. Everything I've read says that these engines are designed to run OK at any temp < 120.

If you are concerned, Water Wetter drops the coolant temp about 5 degrees.
'93 400E
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Old 06-05-2001, 12:22 AM
PBL PBL is offline
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Join Date: Mar 2001
Location: Colorado
Posts: 29
My 93 300E is having the same problem.

I dont think its the engine size...

My uncle also has a 90 300E. His is running hot also during the summer with the AC running.

I took it to the dealer and they said that the fan should turn on at 115. The dealer said it was some sort of sensor problem. I wanted a second opinion. Therefore, I took it to another repair facility. They said it was the Aux fan malfuction. They confirmed it by allowing the car to idle with ac on for a prolong period to raise the temp. They then measured the voltage to the fan. And sure enough, there was power but the fan did not turn. Go figure!
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Old 06-05-2001, 01:13 PM
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Join Date: Jun 2000
Location: Saugus, CA USA
Posts: 2,007
I disagree (respectfully)) with 400E about the fans coming on to protect the compressor. For the AC to work the condensor needs air always flowing across it. When my fan wasn't working the AC didn't cool at all at a stop .

There is also a thread from a physist with too much time on his hands about lowering the temperature the fans come on. The temperature was set by the EPA to keep the smog down, cooler engines are dirtier, but when its 100 out...

And I was considering looking into a way to have the electric fans stay on after the engine is shut off to keep things from cooking under the hood. I thing things get hotter right after the engineis shut off and cooling them a little would make stuff last longer.
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