I just got a used 1987 300D on eBay and it had some ghetto rigging done to it before I picked it up.

The A/C compressor was activated with a toggle switch and worked fine until I turned the fan off.

Then next time I tried to turn the fan on it wouldn’t work. Also, I noticed that the high fan speed button is stuck. Any ideas on how they might have rigged it up the first time.

Another thing that is not right for sure is the engine coolant temperature gauge. It shows around the 60 range. I am not too concerned with it unless this engine overheats and they did this to mask it.

Do you know where the lead wire and sensor is?

__________________
1984 300D / The only Benz I have

Completed weekend projects

1. R/R front crankshaft seal
2. R/R nearly the whole vacuum system
3. Converted to WVO www.greasemachine.com
4. Upgraded to electric power locks
5. Upgraded and rewired stereo/amp/speakers
6. Installed 2.88 differential

get that temp gauge fixed fast! you REALLY don't want to be unaware of your engine's temp.
ya might want to test your head gaskets too. simple cold overflow test should be ok to clear the head gasket.
John

My 300SD ran 60c when I got it...tstat would open when needed but not close again...new tstat...now runs 80c-90c.

__________________
1983 300SD 307k miles
1993 Ford Escort Wagon 215k miles
1995 Isuzu P'up 214k miles

It may not be too hard to trace out since most folks who ghetto-rig have never taken the time to look at a wiring diagram. They usually "find" 12volts somewhere and splice it direct. Look for the simplest point A to point B solution and you can usually find the cheap butt splices used for this butchery.

(My experience in tracing down this crap, in general aviation, is more than I care to mention.)

__________________
Sam

84 300SD 350K+ miles ( Blue Belle )

I hope it was on the ground. I'd hate to find this sort of thing on a plane while I was on it in the air!

__________________
" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century

OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles

I have seen navigation system add-ons that would make some of these car stereo places shake their heads.

__________________
Sam

84 300SD 350K+ miles ( Blue Belle )