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Could this be the fan clutch, radiator, or both?

I spoke with a M-B specialist last summer, and he said that it was normal for the temp to reach 100 with A/C on in traffic. Well it's winter now, and I notice that it my temp meter reads right at 9 O'Clock while driving and slowly moves its way up if I sit for a while. It never actually hits 100, but something tells me this is not normal.

My fan clutch still has a lot of resistance in it.

Thanks,

Chris
 

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check every thing before you buy A new part.

the problem itself seems strange as my car never goes above the normal temp, even though it's a diesel:D

also check fluid levels, you might not have enough coolant in the system.
 

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Installing a new thermostat w. gasket, and checking whether the correct coolant is in the car, is a simple and inexpensive DIY. Try a search, and check the sticky on top.
If that doesn't help, and the fan clutch is ok, perhaps the radiator is plugged up.
Good luck
 

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How many miles on the radiator?

It might be time for a through cleaning of the coolant system using citric acid.

MB sells packs of citric acid for this purpose.

- Drain the coolant.
- Refill with water mixed with the citric acid.
- Run the car for about 30 minutes.
- Drain and flush with clean water until the water comes out clean and free of suds, then fill with water and MB coolant/Zerex 05 mixed 50/50 (or 70/30 in warm climates).
 

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Change the t-stat. Takes 5 minutes. Car should run around 80-90 degree C. I think the T-stat is set at 83 (stamped on bottom). 100 is way too hot in winter driving.
 

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T stat in a 116/116 takes a Bit longer then in an M103..but it's still not Bad, just the rear fastner on the housing can be a hard reach, and often they like to corrode making life even more fun;-)

Jonathan
 

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More than likely your fan clutch. Easy to test and fix. With a cold start, the clutch should engage for a few seconds and then freewheel soon after that. When the car gets too hot, it will engauge again. You should be able to hear it engage. There are other methods to test clutches, some more technical and some more simple but potentially dangerous. For you safety, I would just listen for it to see if it's engaged.

If you are on a budget or like to tinker, you can also attempt to rebuild clutches also. I've done this and it works. The following applies to Porsche 928's but Mercedes and BMW generally use the same supplier or design (BEHR). I sourced the fluid from Toyota (I have a friend in the parts dept). Pay attention to the grades. The procedure can be found here:

Cooling Fan Clutch Rehab

If you try this, let us know how it worked for you.

D

Again, this has worked for me

[Edit]

Oops, I missed that fact that you said your clutch still has alot of resistance before writing the above. What's alot of resistance? With the motor on the hot side, you should not be able to stop the fan from turning. If you can slow or stop the fan when it's hot, I think the clutch is on it's way out. Again, you can do the procedure above. The fluid is cheap compared to a new fan. Please report back with whatever your solution it.

Thanks

D
 
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