Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, Transmission fluid change in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; This weekend I'm going to drop the pan and filter and change the transmission fluid. I've read a bunch of ...
This weekend I'm going to drop the pan and filter and change the transmission fluid. I've read a bunch of posts and watched a few videos but I was wondering....after you fill the pan back up and start the car, pressing the break, to shift it through the gears(P R N D), should I shift it through sport mode and manually 1-5 also or does that part not matter?
Sport mode only changes your shift points. As far as the mechanics of the trans it makes no difference. fyi drain and refill only changes about two thirds of the fluid. I good change involves tapping into the cooling lines, clean fluid in , used fluid out until it runs clean. Personally I rather pay the dealer $70 to replace it, auto trans two finicky for a home garage in my opinion.
Its a DIY job and can be done in your garage, but refilling is a pain since the car has to be level and running in order to refill through the fill plug on the side of the trans via hand pump. Remember no dipstick in the engine bay. Ive done mine 4 times myself so im pretty good at it now.
Well the last dealer i asked about changing(not flushing) the fluid gave me a quote of $175 so I figured with the proper knowledge and tools I would save the money. Thank you, truly, for your opinions though!
Trick is simply measure how much you pulled out as a starting point to refill it (pour the used fluid into used clean milk gallon jugs and a sharpie to mark it). The Best way to fill quickly at home is to use a small funnel with a long hose. Two people are best for this. One pouring the new fluid into the funnel standing up next to the car /one under watching the fluid go in. A Hand pump will work just takes longer. Have a pan under the car to catch any overflow. Do not use silicone on the pan gasket. The silicone can fall in when you tighten it silicone will plug the passages inside the trans. Most gasket will have a few holes slightly smaller so the bolt fit snug and will hold in place when doing the install. Dextron VI fluid to use. I Never worked on a CTS trans but this has worked well on MBZ and BMW's for me. I think for $80.00 dollars the dealer is only draining it at the plug and adding new fluid.
The flush stay away from it unless you are dropping the pan and replacing the filter when you are done doing the flush it. Think about it All the fluid and metal is pulled through the filter and stuck there.Years ago both Ford and GM would not warranty the Police car if we used a flush machine. Lot's (almost all) of them failed shortly after the flush machine only was used. I always dropped the pan after I was done using the flush machine and none of the car I worked on blew the trans.
How hard would it be to add a spout? Run either silicon/braided-SS, or rigid-SS, hose from the fill plug hole to anywhere accessible without crawling under a car with 5" of ground clearance. You could not have a dip-stick unless you used the rigid tubing, but you could probably figure out about how much Dextron-VI to add for a given distance, or a given percentage drop on the DIC transmission fluid life read-out. Maybe it is more trouble than it is worth.
I, personally, am just taking it to the dealership. Flush/filter/fill service, and installing an external cooler and tranny temp gauge. I look forward to using Sport mode way more often once I get the transmission freshened up.