for people towing anything with your GL
guessing this applies to all models but definitely the diesels
towing a travel trailer with mine and sometimes a lighter, smaller cargo trailer i have an edge cts monitor with a transmission temp sensor in the pan and also an egt sensor so i know where my temps are whole truck running hotter than i wanted pulling mountain grades with the travel trailer, actually get some increase with the small cargo trailer too but not as much anything back there bumps it up on temps at least 10 degrees anyway halfway through a trip through the mountains here in az i pulled the engine cover and all the pans off the bottom of the truck 10-20 degree drop in trans temp- did not do much for engine coolant but definitely a good drop on the transmission i would recommend anyone pulling trailers to remove those, at least for summer hauling being in az i dont have issues with needing to warm up the engine or trans anytime where the pans might help |
Bigger trans cooler problem solved
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which one did you add? could you send a link to the one you put on and maybe some pictures of how it fit
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Sorry didn't mean to confuse....i havent added one yet to mine but do plan on towing alot more and will be upgrading the trans cooler from an f350 or something oalong those lines
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Need more data! :)
What kind of temps are you seeing for coolant, EGT and tranny? What do you see without towing? And where do you have the EGT probe mounted? |
prior to pulling the belly pans coolant and trans temp stayed about the same- now trans runs anywhere from 10-20 cooler than coolant
no trailer -- running around town/75-80 mph on the hwy and 80-90 degree outside temp coolant 190-205 trans 187-195 egt been lazy and havent really watched - it is set with an alarm to go off around 1200 so i start keeping an eye on it- it is mounted after turbo i use it to cool down after towing/hwy etc pulling pretty light 6x12 cargo trailer same outside temps- running 70-75mph on the hwy coolant 205 to maybe 217 trans temp about the same these numbers are from before pulling belly pans 5500 travel trailer - springs over axles so big sail back there to catch wind in the flats before belly pans off 50-63 mph outside temp 90-103 coolant 205-220 trans same climbing mountains say tucson to flagstaff/payson area --coolant and trans are hitting 230-235 top end and i start getting worried- will pull over and let things cool and then head on belly pans off seems to have dropped that to 215-225 on trans coolant still hotter than i would like but maybe 5 degrees cooler these numbers are all uphill grades, drops pretty fast if the grade slacks off for a bit etc i dont love these numbers, but no cel or warning of any kind on the truck pulls the mountains well, plenty of power and in reality not much hotter heading up these big grades from in the flats with no trailer guessing a 20-30 degree jump heading up a mountain with 5500 lbs behind it is reasonable... if there was a good aftermarket trans cooler setup that fit i would probably do that- at this point trans is running cooler so might like extra fan on coolant or something.. not 100% set on using this truck for the travel trailer yet so waiting on any mods etc |
Did you do the trans fluid drain & fill ? MB's revised interval is 39k miles I read somewhere..
Also just to clarify, by ' belly pan ' you mean the splash shield ? |
I think you're right that the numbers really aren't that bad. Even the 235* coolant, while getting hot, is still about 30* from boiling. Granted, I'm not saying it's OK to run close to boiling - I sure as heck am not! This is only a guess, but I would imagine it might take quite a bit more load on the engine to raise the temps much higher.
While I'm still pretty new to this vehicle, if there are existing rubber lines anywhere for the current transmission lines, then you may be able to just splice into those and use any type of tranny cooler that you can get from, for example, Summit Racing. I have one setting on my workbench to add to my '98 Suburban (diesel). But I've been hesitant to put it in because of colder temps (which you won't have in AZ). During the winter, it might not allow the trans to get warm ENOUGH. One of the neatest things I put on the rack is a set of 6" tall L-brackets. It makes it very convenient to haul wood or longer things as it will contain them left-to-right and keep them from shifting. |
Sorry don't know the technical term for those plastic/rubber shields that cover the bottom of the engine and transmission
My vehicles fluids are always changed way ahead of time, if I continue pulling big trailers with this truck will probably be changing the transmission every 25,000 or so Dennis would like to see pictures of your L brackets I agree the numbers are not terrible but I would love to see it cooler across the board My experience adding aftermarket stuff on the Mercedes has not been as easy as my other vehicles probably because there's not as much room Will do a few more trips with it and then decide and if I'm going to continue hauling with this set up or swap trucks If I'm going to be using the Mercedes good chance I will add some extra cooling stuff |
Check out the larger trans pan for the 722.9. Speedriven makes one. The extra capacity helps a lot.
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Excellent info goalie, thank you, will research that for sure
I will probably do that anyway, even if not towing |
quick search found the speedriven which is really expensive and then this one with more fluid capacity
http://weistec.com/722-9-transmission-pan.html just wrote them to see if there is a port for plugging in my trans temp sensor |
thats even better
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got this back from them----
Thank you for your email and interest in Weistec products. Our transmission pan is designed to work with any 7G transmission. As long as your car has the 7 speed MB transmission, it will ft. In regards to screwing in a trans temp sensor, there are provisions for A/N fittings used in a transmission oil/cooler setup that could potentially be used for that purpose. Whether or not it will be a direct fit, I cannot tell you. If you have any further questions or concerns, please let us know. Thank you and have a good day. ---- so seems like no issue on the trans sensor, should be able to make it work... |
Thank you for the link! Just placed an order with Weistec. In 2 weeks, I am taking the family on a 3000 mile journey towing a 5000 lb 1968 Airstream. Until now, all my Airstream and boat towing has been in relatively flat Florida. Worries about NC mountains have been keeping me awake at night. With the Weistec tranny pan, I will sleep a little better.
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Did they have them in stock?
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Originally Posted by goalie_k
(Post 7171776)
Did they have them in stock?
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Towed my 18ft travel trailer from Phx to the Grand Canyon. Did some data logging. Engine temps can on pretty high climbing the hills... almost all the way to the top of the gauge! Off the top of my head that is 120C.
Egts were about 1100 max Trans temp 230f Boost 23psi but never got fully into it (the ecu is tuned) Has anyone else dataloged EGTs while towing. |
goalie_k What are you datalogging with?
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Torque app.
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towing with GL
I have been towing my 30 foot Airstream for about 5 years now with my 2011 GL350. I concur on the temps, especially towing across colorado on huge climbs. I take it real easy, back off throttle and let the torque do the work. In addition more frequent fluid changes i think have helped.
Really like the deep pan for the tranny. Wonder how you check fluid level without the OEM tube? |
I dont think mine has a dipstick for trans but not sure
What WD hitches are you guys using for towing? I have a blue ox and like some things about it but have adjusted several times and dont think i have it dialed in perfect Considering a propride hitch |
Originally Posted by clvincent
(Post 7183583)
I dont think mine has a dipstick for trans but not sure
What WD hitches are you guys using for towing? I have a blue ox and like some things about it but have adjusted several times and dont think i have it dialed in perfect Considering a propride hitch But I did just install the Weistec tranny pan. A beautiful piece of engineering that I expect it will reduce transmission temp significantly. Makes the OEM pan look like a piece of junk. As a bonus, it has a drain plug (no need to drop the pan), and 2 ports for an additional cooler, or temp sensor. |
Originally Posted by KrustyKustom
(Post 7182560)
I have been towing my 30 foot Airstream for about 5 years now with my 2011 GL350. I concur on the temps, especially towing across colorado on huge climbs. I take it real easy, back off throttle and let the torque do the work. In addition more frequent fluid changes i think have helped.
Really like the deep pan for the tranny. Wonder how you check fluid level without the OEM tube? Does your GL have some kind of dipstick for checking transmission? |
I think the biggest issue with mine is my trailer has the axles over the springs, so I have awesome clearance everywhere but catch A lot of wind
I would not mind spending the money on a propride if it would really tighten this up but I don't know if it will.... You certainly never hear anything bad about them, everyone says they are worth the money |
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