[FloridaCole]

Does anyone know a part number for the Tropical Climate Thermostat for the M117 V8?

I believe A 116 200 03 15 is the Standard Climate thermostat.

I know Mercedes normally offers tropical climate Tstats.

A part number would be greatly appreciated.

Thanks in advance.

 

[mclare]

Are you talking about the 70C one? I have one of those in my car. Let me see if I can find the P/N. I didn't order it, AV Mercedes did for me. I put in a call to them.

 

[FloridaCole]

Yes Sir. That is what I am talking about.

Thank you so much.

 

[jhodg5ck]

Ooo....I just used my last 70 degree t-stat a few months ago, I'll scare up some more

 

[FloridaCole]

My G-Wagen with M117 motor is running at 90 Celsius or just below in town. If I am in slow moving traffic, temperature creeps up just below 100 Celsius.
All synthetic fluids, visco clutch has drag when I spin it, etc...
Prolonged highway speeds of 80 MPH or so put be a couple mm below 100 Celsius on water temp gauge also.

This is when outside ambient temperature is in the 90s with lots of humidity.

Spoke to another forum member in Germany that has an identical G-Wagen with M117 motor.

He advised that since my truck started its life in Hamburg, they probably fitted a cold weather T-Stat. And told me to order the Tropical Climate Thermostat instead.

I fitted a new radiator cap already.

Did a flush and fill of cooling system. There was no rust or corrosion present. I am running 70/30 in favor of distilled water, with a bottle of water wetter. All Synthetic fluids in the truck.

I am contemplating the citrus flush, but if there was no corrosion, not sure it will assist?

If it is not the T-Stat, I will look at 1. Citrus Flush 2. Visco Clutch 3. New Radiator.

Really scratching my head. Coolant was extremely clean.

My friend in Germany with identical truck runs at 90 Celsius even when he is cruising at 140 Kilometers / hour.

The only other thing we could think of is I have fog lamps on my brushguard that are blocking flow of cold air to the radiator and may prevent hot air from exiting as well.

I will remove these fog lamps and test.

Just below 100 is not hot. I took a temperature reading of my coolant in the overflow tank when it was hot and it only showed 182 Fahrenheit.

I know I should have measured at the crossover pipe by Tstat, but didn't have good access to measure this area.

Maybe the dash water temp gauge is just inaccurate.

 

[jhodg5ck]

That's a little warmer than I would like..a citric acid flush is never a bad idea when getting into something with a bit of time on it.

The temp gauge senders are reasonable, so ordering one for POM is never a bad idea.

As for the visco fan clutch, it may still have resistance but could be on the weak side. I rebuild a lot of FC's these days, but do so w/ the Heavy/Tropical (per Lexus/Toyota @ least) 10,000 VST fluid. It does a Handy job of keeping a number of V8 equipped 124/126/129/140's Comfortable here in Atl.

I also like to add a resistor in line so the aux fans kick around 96/97C. 1.1 kohms will do it.

Jonathan

 

[FloridaCole]

Interested in re-building an oddball AMG visco clutch?

I probably can get you another one as well that belongs to my buddies truck.

Pictures are from my buddies truck

Notice comparison of W116 viscoclutch vs the M117 AMG fan clutch....and notice the AMG fan clutch ONLY has a 4 bolt mounting plate...Notice the small size and 6 bolt mounting pattern of a W116 viscoclutch next to the bigger AMG plastic fan.

I read about the procedure using Toyota Silicone Visco Clutch fluid...

 

[tusabes]

Wire the aux fans to turn on at 92 and put in the low temp tstat

Citric acid flush can cause problems , per prior threads

 

[FloridaCole]

Wire the aux fans to turn on at 92 and put in the low temp tstat

Citric acid flush can cause problems , per prior threads

Will do.


I think people take the citric acid powder and dump it into the cooling system whilst it is in powder form.

From what I have seen, you need to dissolve it in warm water first. Then add it to the vehicle.

Thoughts???

I can always use Prestone Super Flush.

Like I said, I drained the coolant and it was real clean.

 

[tusabes]

You just flushed it , seems to be a waste to donut again if the low temp tstat and aux fan resistor fix it

 

[FloridaCole]

You just flushed it , seems to be a waste to donut again if the low temp tstat and aux fan resistor fix it

I changed the old fluid that was in there for new fluid.

I have not done a citrus flush yet.

Did the people that had problems with the citrus flush properly dissolve the citrus powder into water BEFORE adding it to the cooling system???

 

[tusabes]

That I dont know, but a search for citric or citrus in this forum should pull up the threads

 

[at4wobe1]

I live in South FL. Never had a Problem with regular Tstat after I put a new radiator. Before I had same symptoms as you.

Wolf

 

[ianrandom]

If the t stat doesnt sort it, I'd recommend a new radiator. Both mine really benefitted from it. (Not that I live in a hot place but still had mild overheating in traffic.)

 

[mclare]

I had a problem with the CA flush, but that was because my FPR went bad in the middle of the flush, and I could not get it all out and it sat in there two days and rotted out the freeze plugs.

To the greater question of overheating: My car was overheating this summer and the block had just recently been tanked, and was free of any corrosion inside of it. I then replaced the Tstat with the 70C one you are referring to. That did not help at all. I then went and ordered a new radiator AND a new condenser which sits right in front of the radiator, and since then my car has not overheated once, even with the AC blowing at full clip.

I live in one of the hottest cities in the US, Lancaster CA, where the summertime temps average over 110F from July through September. Not once after then did the temps go over 100C, an acceptable summer operating temp.

When it did get up to 100C, which was always from sitting in traffic idling, I would hit the def button for five seconds or so, and the temp would go down to 90 again. But the car on its own never got over 100 on its own, after I swapped out the radiator and condenser.

I replaced the condenser too because even though it look clear, I felt that a new one would allow max air flow through it.

So I would recommeNd that you replace both of those.

 

[Chicky]

Any news on the part number for tropical thermostat? Thank you in advance

 

[Dr. Sternschnuppe]

Tropical version have additional tank (at right wheel arch panel) for cooling fluid, which is connected with expansion tank.
Also some cars for hot countries often have S.A. code #490 - elimination of the windshield heating/elimination of the windshield heating and of the heated windshield washer.

There are three types of the thermostats for the M117 type engines:
117.960/961: start of control at 75* (+1*/-3*) C, end of cotrol (fully opened) at max. 92* C
117.962/963: start of control at 84* (+2*/-2*) C, end of cotrol (fully opened) at max. 99* C
117.964/965/967/968: start of control at 80* (+2*/-2*) C, end of cotrol (fully opened) at max. 94* C

N.B. No special version of the thermostat for the tropical climate/hot countries.


Salutte!

 

[jhodg5ck]

I've been using the CA flush for about 8 years, never had a problem, does the job w/o tearing things up.

If you'd like the old clutch re-done, fire her up here..we're doing them on a fairly regular basis these days...some of the FC's are INSANE $$$$, and with the proliferation of Chinese crap on the market, rebuilding makes a Lot more sense.

Jonathan

 

[mclare]

As soon as I get better, (I have the flu and. Cold) ill go down to Dragi's and get the PN for the 70C Tstat.

 

[lowphat]

As soon as I get better, (I have the flu and. Cold)

Your Avatar looks like she can go a long way towards helping you get "better."