My 82' 300d temp runs about 90 -95C, I guess this is normal. So my question is , when does the aux fan come on? When the ac is on or is there a temp. switch in the radiator?

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'83 240D 264k on 100% biodiesel/ 31mpg
83 300D 217K the $800 gem
'82 300D 267K the new WVO project car finished and driving for free
International tractor B275 on B100
Ford 555 backhoe on B100
Sargent 25 ton Rough Terrain crane on B50

The aux fan comes on when freon temps in the dryer reach a certain level. It cycles with the temp fluxuations.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D

There are 2 temperature activated switches that operate the Auxiliary Fan.....

Temperature Switch 100*C in Thermostat Housing for Auxiliary Fan

Temperature Switch 62*C in Receiver Drier for Auxiliary Fan

Either of these should turn on the Auxiliary Fan, independent of each other....

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG

Did I read an old post of yours? - something about the thermostat/coolant temp switch being available in 90* or 95* as well?

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!

why does everybody use the astrisk* for the ° mark?
John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Because most keyboards do not have the º symbol. I have to use ALT0186 to make it come up. The * is easier, or use number w/C or F.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D

Boy, my fans just came on for the first time today. HOLY COW! You can hear them a mile away! didnt like how they came on. off.on. off. Suspect the temp switch is hosed, or is that normal for an MBz, quick cycling that is?

I was able to buy a thermoswitch for the thermostat housing that lets it open at 80-85 deg C but haven't had a chance to install it yet. Part number is:

0055457024 single prong, Behr
0065451524 double prong, Behr

Both 80-85 degree switches. I think the original thermostat housing sensor is set to 100 deg C.

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http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg

I think Shoebilly and I discussed this one some time ago. I knew there was another switch in there somewhere!

We're just not a smart as you are John.......

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

I use the asterisk in place of the degree symbol because I am too lazy to fool around with the character map......

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG

So I found a bad connection in the AC circuit, and now the AC works flawlessly ( thank God ! didnt want to tear a dash apart right now!), BUUUUTTT those fans... they'll "fire up" when I'm starting the car!

Car is in the garage for the pre glow harness replace, and I see the temp plug on the thermo housing is part of the harness. Hoping that the new harness takes care of it, but if not.... will have to dig into this circuit more.

It like I think I'm going to can the Hirschmann antenna ( that I rebuilt) in favor of a fixed mast one, so I dont have to remember to turn the radio off, so my battery is doing nothing but glowing plugs and cranking over a 22:1 motor on startup! Not running uneeded fans or raising masts.