i have a 94 e420 when ac is on get cold if iam running the car but if i come to a stop it starts to blow cool could this be in need of freon plus the fan on the left side will not come on while the ac is on i can spend the fan an it acts if it wants to run but it will stop could someone help me out.

I think the fans should operate together. So, if only one fan is running, I would fix that problem first. If you were really low on freon, the other fan would not come on at all.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles

Fans are wired in parallel, so both run at the same time, unless one of them has a problem. Sounds like that's what you have nucor. It's either the wire/connector to the inop fan or the fan motor itself. If you've already tried spinning or tapping the fan to free it up and it still won't work, it's likely a bad motor. Each fan has a plug-type connector. Check it for continuity.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

My 95 has one fan out,(to much work to change in a cooler climate) and other than when it's north of 85°, it works fine, but I can tell it could use the air flow over the condenser from the inoperative fan. I concur with "Cal Learner" they are parallel and plug in. Motor toasted on mine.

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Mark
========
THE WHITE FLEET
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2005 E320 CDI--140K--WHITE
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1991 190E 2.3-73K California Perfect.--WHITE
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1987 300D Turbo-213K--WHITE
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the fan will start if i spin it but it will stop is that the motor

also the fan on the right comes on soon as i cut the ac on

Check out post #14 in this thread.

124 aux fan replacement

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles