Quote:
Originally Posted by BWhitmore
The electric fan on a W123 car is wired through the air conditioner pressure switch which is located in the AC hose near the receiver drier. You may have a bad pressure switch or your AC system may be low on freon. With the AC on high look at the sight glass on top of the receiver drier. If you see bubbles that is an indication of low freon. The pressure switch will prevent the AC compressor from engaging or the fan from coming on if low on freon. This may also explain why your AC does not work well in hot weather.
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There is plenty of "freon". It's ice cold when it isn't scorching hot out side and I don't see any bubble through the little glass. (Rather hard to see anyway) I've also jumped the sensor and the fan doesn't turn on.