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  #1  
Old 10-07-2008, 09:06 PM
nickofoxford's Avatar
2 doors, 5 cylinders
 
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Location: S.E. PA
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Shivering 240D

Hey guys. My '80 240D runs COLD! I can pretty much assume my thermostat is stuck wide open. I drove for 2 hours tonight and the temperature gauge didn't move at all. I had some heat, but the engine stayed cold. My temp gauge does in fact work, but driving at night when it is as cold as it was tonight she just will not warm up.

So, new thermostat should clear that one up? I've never done this anyone got some neat tips and tricks?

Another thing.. The radiator fan is always engaged, so this could be the problem IF the thing is supposed to shut off until the engine is warm enough. If it is temperature controlled what should I do to get it back into spec?


So what do you think, fan clutch or thermostat.. or any combination. I would like to get my fuel economy back I've heard cold diesels don't quite "sip". I miss that almost instant hair drier like heat at night too.
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  #2  
Old 10-07-2008, 09:15 PM
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My 82 had similar issues and a new t-stat fixed up all no heat problems.
Simple repair, just remove enough coolant from the bottom rad drain to below the t-stat level then pull off the housing and replace
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  #3  
Old 10-07-2008, 09:49 PM
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I believe 240's dont have fan clutches.
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  #4  
Old 10-07-2008, 09:55 PM
ForcedInduction
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Quote:
Originally Posted by coonerboy View Post
I believe 240's dont have fan clutches.
Early ones don't.
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  #5  
Old 10-08-2008, 12:39 PM
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Mine is an '83 and doesn't have a fan clutch either...

On the thermostat replacement just make sure the new one goes in the same way as the old one. I replaced the one in my 240D once and put it in backwards. You get very weird results, mostly overheating. I was very embarrassed to have my Indy write "removed, reversed, reinstalled" on the receipt...
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  #6  
Old 10-08-2008, 07:00 PM
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2 doors, 5 cylinders
 
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Alright sounds good, checked it out today and yeah no fan clutch. That thing has to be majority of my engine noise going down the highway

Is there an aftermarket fan with more blades and a clutch, better yet is that even feasible? I was also thinking about going all electric and just taking the old fan out and putting some kind of monster electric fan on the front where the dead AC fan used to be. If that would have any decent thermal capacity I could wire that up for the AC and the engine temp no problem (when I get my AC to work, that is ) Any good threads on this?

I'll see if a thermostat fixes the problems. Can someone back me up that a cold engine gets sloppy mileage?
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  #7  
Old 10-08-2008, 09:24 PM
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Quote:
Originally Posted by nickofoxford View Post
Alright sounds good, checked it out today and yeah no fan clutch. That thing has to be majority of my engine noise going down the highway

Is there an aftermarket fan with more blades and a clutch, better yet is that even feasible? I was also thinking about going all electric and just taking the old fan out and putting some kind of monster electric fan on the front where the dead AC fan used to be. If that would have any decent thermal capacity I could wire that up for the AC and the engine temp no problem (when I get my AC to work, that is ) Any good threads on this?

I'll see if a thermostat fixes the problems. Can someone back me up that a cold engine gets sloppy mileage?
There are those who say electric fans are great and those that say they're crap. Probably the easiest thing to do would be to fit a fan with clutch from a 300D...

I can back you up on mileage, all 3 of my MBs had bad thermostats and all say 20% or better increases with a good one fitted.
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  #8  
Old 10-08-2008, 11:33 PM
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Quote:
Originally Posted by ForcedInduction View Post
Early ones don't.
None do, I think, my 85 doesn't.
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1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
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  #9  
Old 10-09-2008, 06:22 AM
t walgamuth's Avatar
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Ive never seen one on a fwo forty.
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  #10  
Old 10-09-2008, 12:10 PM
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82 240D, no fan clutch.
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  #11  
Old 11-03-2008, 12:47 PM
nickofoxford's Avatar
2 doors, 5 cylinders
 
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So, will a clutched fan bolt up? That would help out with the roar of my 240D hauling @$$ through the night Or will that just over complicate things?
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  #12  
Old 11-03-2008, 01:31 PM
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I think if the MB engineers figured it would be a good thing they woulda put one on the 616.
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1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #13  
Old 11-05-2008, 10:31 PM
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replace the thermostat and crank up the tunes to drown out the noise hahaha. It's kept your engine from overheating for years and will continue to do so
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