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#16
04-15-2008, 01:44 AM
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Do not discount the mechanical fan yet. The fan doesn't "stop turning" when the clutch fails. It does in fact turn, but not at full velocity when that velocity is required.
Not sure if a 300 even HAS a fan clutch, to be honest. If it does, it is highly suspect. When mine went out, that was my precise symptom. Stop moving on a hot day, temp climbs toward redline. When you get the air moving again, it stops climbing. Spin the fan with the engine hot but not running. If it freely spins, the clutch is bad. If it feels stiff and tight, and stops after a turn or two, the clutch is good. EDIT - just fixed my mistake, this thread is about a 300, not a 240.
__________________
 ~Michael S.~ Past cars: 1986 300SDL 1987 300SDL 1982 240D 1982 300SD Current: 1987 300SDL 
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#17
04-15-2008, 08:29 AM
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__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#18
04-15-2008, 08:33 AM
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Thats proof that they stock a generic part. Show us a picture of that part on a 1983 300D.
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#19
04-15-2008, 08:59 AM
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Quote:
Many of these parts houses list parts for gasoline engines that are not on the diesels. Their database is far from perfect. The '83 doesn't have that switch on the diesel.
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#20
04-15-2008, 04:59 PM
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hey! stop being so mean to the gasser, he doesnt know any better!
BTW, mine does work even when the A/C isnt on, but mine is a '91 w124. but you were wrong anyway FI, cuz you said only the w116 has the switch.
__________________
1991 300 D 2.5 Turbo, 220k also in the family: 1981 240 D 185k 1991 350 SD 185k 2006 S 500 2005 SLK 350
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#21
04-15-2008, 05:03 PM
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Quote:
"Only the W116 300SD has the switch." Technically...........Lance wins. 
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#22
04-15-2008, 05:34 PM
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My 300TD exibits this same behavior when the coolant is a little low. Temp creeps up at stoplight, back down when moving. Top off the coolant and it is back to normal.
__________________
tgingrich '83 300TD 282k '83 300D 239k '82 300SD 204k DFW
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#23
04-15-2008, 08:05 PM
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It's possible that the thermostat is also bad, and stuck open. But that would also mean that at highway speeds the temp would rise.
While you guys are debating on the thermoswitch, can you tell me what the switch on the thermostat housing is for?
__________________
http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg
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#24
04-15-2008, 08:24 PM
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My two cents
First of all the guy's problem sounds like an underfilled radiator. Top tje system off and do a search on 'burping' the system. Make sure that there are no leaks. If that doesn't help, I would search on 'citric acid flush' there are step by step instructions on how to do this.
For what it is worth, both 617s I have had (one from a 1981 SD and one from a 1983 300D) had the sensor on the T-stat housing to turn on the electric fan. I know this is the case because one failed and ran the fan all the time. If I pulled the wire, the fan stopped. They work by providing ground for the fan.
__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#25
04-15-2008, 08:46 PM
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^^^Thank you for posting!!! I win!!
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#26
04-15-2008, 10:01 PM
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Quote:
 Go enjoy your 15mpg.
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#27
04-15-2008, 10:40 PM
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I've seen a diesel engine before, and I my knowlege extends far beyond gas engines.
Don't be mad because you really dont know it all, like you think you do.
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#28
04-15-2008, 10:42 PM
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Quote:
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#29
04-15-2008, 10:45 PM
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Could be the radiator and/or electric fans.
My car needed a radiator and electric fans. It never went into the red, but the temp would go up on idle (fans) and when climbing hills when it was hot outside (radiator). The fan clutch was OK. Now I think I hear a squeak in the water pump, grrr.
It is about time to change the radiator on these older vehicles anyway. Be sure to use ZEREX G-05 antifreeze or you will screw up your cooling system.
__________________
1991 350SD (updated rods) Biodiesel B100 when I can find it. Dino when really cold outside
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#30
04-15-2008, 10:48 PM
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I just used that as one source, I didn't say that it was 100% correct, did I? I am using the fact that other people have siad they have the 100C switch for the fan.
Can someone please post a pic of the t-stat housing on a 300D, so I can prove to him that W123 diesels have a aux switch? Just admit it, you know I'm right!!!
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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