So I have tried to research my problem and I cant seem to find a solution. I purchased the truck over a year ago and never had a problem with the transmission. The only issue was a leaking transmission pan gasket so I changed it put the same fluid that came out back in it since it looked brand new and didnt smell burnt or anything. So fast forward time and my girlfriend was driving the truck over the winter and lost control of the truck and spun it around and hit the front end of the truck into a rock wall.I have a weston bar on the front end that took the majority of the hit. Shortly after the transmission would start to run warmer than normal. It would be 20 degrees outside and my transmission temp sensor would be reading around 140. Now that the weather is getting warmer the transmission is heating up a lot more. I took it to a guy to have him look at it and thought maybe the cooler was clogged or something like that and possibly put a larger cooler on it. He called me up a few days later and said their was a larger cooler already on it but it was not hooked up. It is a black one mounted on the front of the radiator. He said he cut the lines off of the old one and there was a slight bend in the one line so he cut a little higher than that line and then hooked up the cooler.He told me he blew in the lines and there was no restrictions in it, i guess no pressure when we blue on the lines. I drove it home and the temp went higher than ever before up to 220. The cooler on the front was ice cold and trans pan was hot.I am starting to think maybe the bypass is bad and the fluid isnt getting to the cooler. The fluid is still pink and does not smell burnt so I want to fix the problem before any issues arise. The truck has 137000 miles on it. Any help would really be appreciated. I have attached pictures of the cooler that he said was already there but not hooked up.

 

So, do you have ANY cooler hooked up? Have you liked?

A Fin Comb wouldn't that AC Condenser either.

 

I am having same issue. I was advised by the transmission guru ( mark) to get the bypass rebuild kit. It is on its way I will let you know. Only cost $25. Seems to be a simple rebuild a couple of o-rings,check ball, and spring. Sounds like this may be your fix as well. http://www.transmissionpartsusa.com/
Here is part # 400-03660502K

 

Don't recognize the cooler but it doesn't look to be much if any larger than the stock one. If your guy hooked that on in series with the stock cooler it would most likely be your extra heat problem. Too much restriction to fluid flow. I did not see your year model. Do you have the transmission oil lines to the radiator as well?

 

Disconnected rear transmission line and started truck, had 24 oz come out after 15 seconds of truck running, nothing came out of rear transmission port. Since there should have been 32 oz coming out I decided to disconnect the line before the radiator cooler to check for blockage. Lines looked REAL rusted and was afraid to disconnect and break them off. Decided to disconnect the line from the 2nd cooler instead, had 24 oz come out again after 15 seconds of truck running. Since nothing came out of the rear transmission port can I assume the bypass valve is fine?? I'm assuming either the 1st cooler has blockage or the internal pump is bad. Also, I'm assuming the 2nd cooler should be okay since I had 24 oz coming out before and after that cooler.

 

I think those are good assumptions.

 

Ok so an update. I decided that since I cannot safely take off the lines at the radiator to see if the transmission is pumping correctly before the OTW cooler I decided to take the line off of the front port of the transmission (the feed line). I got a 1 inch hose and popped it over the hole and started the truck. After about 6-7 seconds I had 42 oz of trans fluid. Would that mean that the pump is working well since I had that much at the front and then only 24oz in the back return line, so blockage in the radiator? I assume I have to replace the OTW cooler, do I have to replace the whole radiator? What are my options?

 

Whole radiator, its a shade over $200 from NAPA.

You cannot swap just the cooler.

 

Have you tried back flushing the lines and OTW cooler and see if any debris comes out? A radiator shop can just change out the internal OTW cooler, but IMHO the cost plus labor would be better applied to just replacing the whole unit. The plastic tanks can fatigue over time and was the reason I replaced my radiator a few years ago. The neck on the upper tank cracked in two places.

 

I think I'm having a similar problem. On my drive home today (14 miles) with an empty truck, mixed stop-and-go traffic and highway my trans temp hit 180*. Temp outside was 97*. I have a 6.0 cooler that is about 1 1/2 years old. What's the best way to check it fluid is making to and out of the cooler? Or should I not be worried at those temps?

 

While that temperature may be on the higher side of the normal range, I wouldn't be be too concerned given the ambient temp and driving situation.

 

my trans runs between 150 and a shade below 190 in stop and go and freeway.. Outdoor ambient is 117 I'm in phoenix so i assume its ok according to my mechanic at work he cleared the lines ordered me an electric model from napa and he will throw it in next week plus it has triple the surface area.

 

Thanks for the feedback. It must be ok then.

 

There is a flush to clean out your transmission lines/coolers. I did this years ago because the transfluid was terribly burnt when I bought this truck. I'm not for certain, but looking at pictures on Google, I think I used Lubeguard Kooler Kleen. I didn't have any noticeable flow issues, or remove any flow-impeding deposits, but a lot of gunk did come out.
I simply blew 75% of the contents of the can into the lines, waited 10 minutes, and used an air hose to purge (messy).
I used the remaining cleaner to "rinse, lather, repeat".

That said, regardless as to how your OTW cooler comes out, I would recommend ditching the add-on cooler, and the stock 9 Row OTA cooler - replacing them both with a 26 Row 6.0 Cooler (5C3Z-7A095-CA).

You will greatly increase cooling over what you have, and you eliminate flow restriction. If done correctly, you also remove at least two points for potential leaks. Mounting is easy - direct bolt-in replacement.
3/8 to 1/2 to 3/8 plumbing can be a little bit of an issue.

Look at this post for a visual. That is your stock trans cooler laying on top of a 26 Row 6.0 cooler:
https://www.ford-trucks.com/forums/1...l#post15435174

There is also a PDF in that post detailing the upgrade. I didn't necessarily like their plumbing methods. However, there are lots of pictures, so it more than suffice to give you an idea of what's involved.

In my case, I was able to obtain the OTW to OTA hose and tube from a wrecked '06 F-250 6.0 in the salvage yard. Since the radiator was crushed, I also removed the OTW flange from the radiator. The 6.0 flange is larger than the 7.3, and I was able to easily machine it to the 7.3 size. IIRC, it was 11/16-20. I cut my threads in the lathe, as a 11/16-20 thread die does not exist. Also, IIRC, a M18x1.25 was very close, but slightly over-sized.

The next hurdle was the going back to 3/8" line from the cooler. In an attempt to follow KISS, I wanted to use a 1/2" to 3/8" 90° elbow directly at the bottom of the cooler. THAT item was hard to find.

But the result is cooling with no leaks, and a transmission that never gets over 175° - regardless of where I am or what I'm towing. I do tow a lot, and change my fluid (completely - including blowing the lines & draining the torque converter), every 50K miles. There is little difference in the color of what I drain and the new fluid.

I've thought of putting these 3 items together as a kit and selling them...