PTE

Hi Folks:
I've been working on a 70c / 160 f replacement thermostat . So far it will fit a C-55 with a M-113 engine , The factory piece is 87 c / 189 f
Opinions , is it needed? Thanks ___PTE___

Eurocharged Rick

i am wondering if it will trigger a check engine light? i would like to do this as well for the C32, but don't know if it will work without the computer freaking out because it never gets to that temperature anymore...

PTE

Look at all the post in E-55
https://mbworld.org/forums/members/25327-rflow306.html
Take Care Patrick T. Eves

Eurocharged Rick

do you have a different link? that just takes me to a member profile page...

PTE

Quote:
Originally Posted by GTA23109a
Sounds great, but there are a couple pitfalls to watch out for.

First, it's going to suck in winter time as the car will have a hard time maintaining temperature. Been-there, done-that with other low-temp thermostat applications.

Second, the ECU calibration needs to be adjusted so the car doesn't get stuck in "cold-start" mode (for lack of a better description) and run rich as heck thinking it still needs to warm up.

If you can overcome these obstacles (mainly the second one) it could prove a very worthwhile, and cost-effective mod.
Quote from rfow 306 Below

PTE made one for me so I have been able to data log and get some feed back. The car idles at about 167-173 with the ac on and 188 to 192 ac off.
When cruising ac on or off, the temp drops to 165. According to my data logger cold start mode turns off at about 130-140 degrees. The o2 sensor voltage and fuel trim changes around there and looks identical to factory thermostat. Big thumbs up from me so far.

Eurocharged Rick

so what are you doing to get it to work? are you just drilling a stock thermostat?

PTE

Don't I wish it was that easly. It is a different return spring . Different vernathern center & valve. Plus some machining to get it all to fit. I do install a air bleed hole in the alum housing.

Eurocharged Rick

so will it fit the C32? what does it cost to put one together?

Zeppelin

So what were the stock numbers? And are the stock numbers bad? How many horsepower do you expect from this, if any. And if none what is the point.

PTE

The stock OEM is 87 C / 189 , the engine runs about 205 F . In traffic it really gets sluggish on a hot day here in Florida. H/P gain on cold or mild day not much , but on a hot day, you have enough reserve , that the motor runs more consentant, from stop light to stop light.

No big hp claims

Eurocharged Rick

the point is not to gain HP, it is consistency with the HP you have....your car runs different on a hot or cold day, this helps to bring more consistency to the performance of your car, especially for someone like me that lives in the humid south....

Eurocharged Rick

so will it work on a C32? what will it cost?

PTE

Thanks PTE. Part number for a E-55 Compressor thermostat assy 113-203-02-75 $78.90

Part Number for a Clk -C 5.5 N/A
thermostat assy 112-203-02-75 $25.00
The only difference I can measure is the addition. bend & lenght in the neck to clear the compressor belt and $54.00?? . For the compressor one. left in the picture

Zeppelin

Just seems strange that a slight drop in water temp would affect the IAT temps that the ECU uses to reduce timing. Most of the lower temp stats I have run in cars do very little if anything. Once the car is up to temp the termostat is always open so it does not matter whether it is a 165 degree or a 195 degree stat they are both open and the temp on the gauge reads the same. I guess I have never had the problems that you have. I have run in 107 degree weather at a roadcourse for 20 strainght minutes at full throttle and never had the car overheat or lose power.

Eurocharged Rick

going to bring this back from the grave...PTE, did you ever figure out what it will take to get it to work on the C32? i want one, need one, just let me know what needs to happen to get this on my car...thanks

PTE

Well this is what Happened. It took 6 weeks to get one for a C-32 , from the other side of the BLACK FOREST, By Stuttgart?? Germany. I finally Got it. Modded it . Sent it out . Wrote the Guy about 3 weeks , , He has decided to wait . Cold weather has set in ,In North Georga. I really didn't want put many out there. Without testing. I do not have excess to a C/SLK -32 . for testing. So I ordered another one ,3 weeks ago. I would rather know that it works , than disappoint a bunch of you.

pshek

PTE,

Would you be able to use a thermostat from a C320 and modify that one for my C32 motor? I have my old C320 motor sitting in the shop, and the thermostat housing looks the same. It rarely gets very cold in California...

Eurocharged Rick

please let me be the guinea pig...it is always hot here in houston, just let me know what it costs when you get it modified and i will paypal you the money, i want this asap...thanks

PTE

I'll order 2 more tomorrow , lets see what the Black Forest brings us??

Eurocharged Rick

awesome! thanks...

AMGSC

I may want to try this for my Supercharged C55. PM me with the price and availablility.

Haywood

Guys, did you ever find a lower t-stat for the C32? I would be interested to put one in my Crossfire. Thanks.

430

I have one installed on my SLK32. It is a great addition. Contact PTE about the thermostat.