I recently had to replace the auxilliary fans. Since then I've noticed that the driver's side vents blow warm air while the passenger side vents blow very cold air. Anybody ever heard of that problem? Also, if this makes any sense, the new fans turned in the opposite direction from the one I replaced. I had to reverse the plug-in to make the blades turn in the right direction (blowing in toward engine). The two probably are related but I sure could use some advice.

Problem number two: Since I've had the car (2 years) the transmission slips when the engine is cold. In other words, if I don't baby the car until it's warmed up, it'll slip. Other than that the car is great

Thanks in advance.

IF the a/c refrigerant charge is LOW then the left side will be warmer than the right.

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Were these fans part of an aftermarket assembly?

I got one from an eBay seller that also was wired in reverse. The unit quit starting entirely about nine months later.

Never again will I buy car parts from eBay sellers. I wish I hadn't done it once.

And yes, the fans turning the wrong direction can cause you to vent refrigerant.

Ditto. I've seen many aux fan assemblies with reverse polarity, so now I make it a habit to check and switch the wires if necessary.

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The motor I bought from Phil was OEM, and wired correctly. It also hasn't failed.

With a 210, it is important to stick with the original setup with two fans, one motor and a belt. We don't have a simple relay running the fan, and the electrical signature of the motor matters to the controller.

how does a reverse wired fan cause a refrigerant leak?

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Not a leak, but a vent due to excessive head pressure.

how do u recharge both sides ??

Actually i bought the fans from this site(mercedesshop.com). The fans were turning in the wrong direction ,what i did was plug it in in reverse and they are working fine now.

please explain further,,,,,I was thinking it could be the actuator not closing all the way because the right side puts out good cold air immediately
, but please if any one has any ideas

If the fan turns backwards, it will actively restrict airflow through the condenser right when the pushbutton unit demands airflow. This will cause the head pressure to rise.

The pressure transducer in the receiver should turn the compressor off before anything vents, however.

As for your problem, 210's have warm left-side vents when the refrigerant gets low. This is a very well-known problem. If you get very low, the right side will still be cold, while the left side blows ambient temperature. Don't ask me why, because I do not know.

Be sure to connect a gauge to the high side if you decide to add any - don't rely entirely on the climate control high side reading.

Right. All I did was reverse the polarity on the fan and they're working fine. Thanks.
But, I'm not clear on the a/c thing. I understand never to add to the high side. How exactly will I tell the high side and low side? Will it be obvious?

The high-side connector is larger; you can't switch them.

It's located by the auxiliary fan electrical connector.

Thanks very much for the help Matt L (you are the man), I added a 12oz can of R134a and it is blowing cold again I i must of done something to the lines when i changed out the auxiliary fans, if it leaks out again i will just replace the lines and all. thanks again for all the help