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The mechanic doesn't think we need a new radiator as it is a pretty new radiator already and we are bipassing the internal cooler. Seems to make sense to me. Is it safe to leave the same radiator in there?
make sense, you just need to plug up the transmission line ports on the rad, or else it might leak engine coolant from there. (since it has already fail internally)
 

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Discussion Starter #23
@ztollon could you explain what's going in the radiator a bit more and why it needs to be replaced.

My mechanic is basically arguing with me that it does not need to be replaced (radiator). I am paying 3k+ to throw in a new tranny and don't want to take any chances with the radiator breaking my new transmission.

Said if we are bypassing the cooler in the radiator there is no way for the radiator to get water in the transmission
 

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Whoaaa dude dont replace a 3000 dollar iteam first before you even know iys broken forsure. Take it to another mechanic
 

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Discussion Starter #25
I did... I took it to two mechanics... The car runs real rough... I can't imagine the tranny isn't a goner.
 

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Is the coolant and trans fluid currently mixed? If so theres only one place on your car that they could possibly mix. That is inside the radiator/built in transcooler when it fails mixing anti-freeze and trans fluid. This normally keeps the trans fluid at, or below normal operating temperature. Regardless of buying a transmission first you still have to replace your radiator or go the external route and plug the "new" trans fittings off of the rad and installing the I believe 3/8" line kit transcoolers which has its own thread, then do very thorough flushes. But anyways why not spend 200-400 on this route and then if your still having problems replace the trans. Which is 3000. But I warn you now, if your fluid is mixing still and your replace the trans its going to be a wasted $3000.

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Or at the very least install a external cooler do a couple flushes and see where that leaves you.
 

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Discussion Starter #27
When we swap in the new trans we are plugging the rad and installing an external cooler.

We already flushed the trans and it ran better for about an hour and then it went back to it's old tricks (maybe even worse)
 

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Discussion Starter #28
Problem with doing a couple of flushes is that it costs about 300 bucks a flush. If I do 2 flushes it costs me 600 bones and then I still need to replace the tranny. That's a wasted 600 bucks when I am pretty certain the tranny is a goner. and if its not a goner its severely damaged and has a short life...
 

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Ur getting shafted on the flushes then. The one time i didnt do it myself i paid 150 for complete trans flush w filter.

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And if your paying 3000 id fight to get the flushes for free. Since your mechanic didnt catch it the first time.
 

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Hi guys, I have a question. I recently changed my transmission in my 2014 Cadillac XTS, I bought a used one, since car had 180k on it and it's a business car. New transmission has 65k, my mechanic did good job but he didn't flush the cooler which I know it's stupid. Recently I realized that my transmission overheating and start slip between gear 3 and 4. Basically when car is cold running perfect but when it's get hot, slip sometimes.l but it's not that bad. I was wondering if the transmission cooler clogged!?! Oh btw I live in Phoenix and you know temperature is over 100 during summer. Wondering if any of you guys have any suggestions or a previous experience. Thank you
 

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I wouldn't worry about the cooler flush. It holds very little fluid compared to the total volume and your fluid is now mostly new. As for slipping, several things could cause this including mechanical failure, but often is incorrect fluid or low fluid level. I would start with fluid level, given that this is the easiest thing to check/correct.
 

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Well I just check the fluid level, it seems ok. Here's two pictures, and yes I know the car should running and transmission should be warm up.. lol. I think overheating is because of high Phoenix temperature+ another problem like transmission cooler, solenoid or even weak cooler fan, I always remember that this car is kinda old and 180k is not a normal milage for this kind of car. Anyway I think the best way to find out is to take it to dealer, it might cost me $140 but if I can save the tranny, that's a big saving. Oh there's another symptoms, recently I figured the gas milage get to high, not sure why. Any other suggestions would be appreciated. Thank you guys. Sorry for my
572569
572570
bad English....
 

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You have a trans dipstick??? I have to crawl under the car while it is running and remove the fill plug to check the ATF level! That's not fair...(Kidding)

Now that the easy stuff is done, the next step is to determine whether you have a mechanical problem. Unfortunately there really is no way to DIY this without the proper equipment, as far as I know. I think a trip to a trans specialist or dealer would be a good move.
 
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