Quote:
Originally Posted by slk230red
Exact thing happened to my '93 190E 2.3 a few years ago and it turned out to be a blown fuse for the aux. fan. Replaced the fuse and no problems since.
If that is not your problem and the aux fan is working for temperature control but not the high side pressure for cooling the condenser, then I would verify that the high pressure switch with the pigtail on the drier/receiver is working correctly.
If the fuse is good and the aux. fan doesn't operate, also check the aux. fan relay in the rear of the main fuse box. I always check mine when I change the oil by shorting the connector at the aux. fan temp. switch. I can hear the relay click before the fan operates.
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Thanks slk230red! The aux fan does work for temp control and not the high side pressure. Just as you described. Is the high pressure switch easily replaceable? My understanding is you have to drain the system before replacing the switch. What do you know about that? I have read where someone tried to replace it and they sent all the freon into the atmosphere!