[Mike Wevrick]

Does a 2003 S500 4matic have a transmission fluid cooler? If not, how hard would it be to add one? Is it a DIY job or big $$ at the dealer? The reason I ask is I am thinking of doing some towing with the car. Only up to 1500 lbs or so but still extra strain on the tranny. Oh, and yes I know you are not supposed to tow with these cars due to the stability control not working properly.

 

[Streetglower]

the tranny cooler is inside of the radiator. the 2 tranny lines that come off the tranny go to the radiator. this is how most cars do it.

 

[Mike Wevrick]

So (just to be sure I understand you) it already has one built in?

 

[Streetglower]

the radiator contains a seperate chamber inside that is a transmission cooler. most cars on the road use this. every car has lines from the tranny that go to the radiator and back to the tranny.

 

[Mike Wevrick]

OK, thanks. This is my first automatic transmission car so I really have no clue except that I know they can overheat if overloaded. I remember seeing ads years ago for add-on transmission fluid coolers. Do even economy cars all have them built-in now?

 

[Streetglower]

yes, all trannies have to have a way to keep the fluid from overheating, thus they put a cooler in the radiator. my honda has one in the radiator. they do make aftermarket coolers which are supposed to perform better then the stock coolers.