I have to replace my auxiliary fan switch (located on side of the peep hole on top of the receiver dryer). Obviously this appears to be a screw-in no brainer but I wanted to make sure refrigerant would not be released while doing so. Or perhaps I could somehow depressurize the system costing $$$!!! 1988 190D. Thanks!

If you have refrigerant in the system, you won't when you remove the temp switch.

and stored.
1a.Install your Switch.
2.replace the Receiver dryer.
3.then recharge.

__________________
'84 300SD sold
124.128

Unfortunately I have to agree. If you have the tools, expertise, and license to do it yourself it's not a difficult job. If you have to pay someone to do it you may want to temporarily (until the system has to be evacuated for something else) wire around the problem so the aux fan comes on in low speed whenever the a/c compressor is energized. Depending on where you live, you may not need the a/c for the next 6 months anyway.

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970