Originally Posted by joe_pau

Well, it's been over 100 the last few days so I didn't get a chance to try anything. But I went out today and started with the basics. I looked at the fuse for the aux fan, first it was the wrong fuse, a white 8 amp. I took it out, and the metal literally fell out of the fuse. I replaced it with a red 16 amp. Turned AC on while idling and the AC seems to do fine at idle. I have to do a test drive to really prove this out.

My question is, when I press the AC switch, should the aux fan turn on immediately? And stay on as long as the AC switch is pressed?

Thanks

Originally Posted by slk230red

No, the aux. fan will only operate when needed either by the aux. fan temp switch, or the high pressure switch on the receiver/drier.

That fuse is the first thing I would have checked, maybe that was your problem having the wrong/defective white fuse. I purchased our '93 190E new and about a year ago I replace every fuse in the car with new ones.

Report back with your test results, you might have just saved yourself some unnecessary expenses.

Good luck

Originally Posted by joe_pau

Interesting! Well, while idling my AC never got warm!! It stayed cool idling at a light and when I pulled over for about 5 to 7 minutes. It definitely was running colder while driving than idling, but not near enough to make it uncomfortable. In fact I could have sworn that while I was pulled over and idling it felt like the AC got a little colder! It could be my wishful thinking too! I expect a 4 cylinder at idle to not cool as well at speed, but is that normal?

Thanks!!!

Originally Posted by joe_pau

I've actually watched and heard the fan at idle! So yes to answer your question.

Originally Posted by slk230red

Great! Thanks for posting your findings, it might help someone else in the future.