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Old 08-13-2003, 02:58 PM
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Join Date: Jan 2003
Location: MA
Posts: 114
300E switch smoking

I have a 92 300E with 165k. To the left of the ABS unit there is a little switch or relay with a metal cover over it that sometimes smokes. Any ideas? It seemed to do it mostly when the air condition is on and the fan kicks in.
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Old 08-13-2003, 05:59 PM
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More info needed; Any wires going to it? what are the colors?
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Old 08-13-2003, 07:22 PM
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Don't Mention the War!
Join Date: Jul 2003
Location: Melbourne, Australia
Posts: 181
sounds like the ballast resisitor for the a/c
300e 294,000mi
380sel 185,998mi
380se 309,980mi
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Old 08-13-2003, 08:37 PM
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Join Date: Jan 2003
Location: MA
Posts: 114
What does the ballast resistor do?

It didn't smoke today. The piece is about 2-3 inches long and has a square metal cover over it. There are two wires connecting to it. One from each end. At the end of each wire there is a fitting that has a hole in the middle and a nut goes to it. Similiar to a mini battery cable. The end of one of them is white, kinda like it was burned. The other is plain silver.

They have a black protective sleeve over them, but I can see one of the wires is black with a white stripe.

Hope this helps.
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Old 08-14-2003, 07:55 PM
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Join Date: Jan 2003
Location: MA
Posts: 114
I found out the part I was talking about is the Aux Fan Relay.
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