Factory cooler in the radiator and I have a second cooler that I installed. Mounted in front of intercooler, down inside the bumper where the air holes are.
Did you remove the original air to oil cooler? Do you have two or three coolers?
Truck has been intercooled, but I did not see a noticeable difference in trans temperature once it was installed. So I do not think its blocking airflow.
Has some debris been caught between the coolers? That will restrict airflow.
If I disconnect the return line from the coolers and have someone fire the truck up. I immediately get a solid stream of trans fluid. Have not actually flowrated it though.
Here is how to tell if you have good flow or not.
1. Get two containers, each at least a gallon. Get a friend to help.
2. Warm up the trans.
3. Remove the cooler line where it attaches to the rear of the trans. Point the line into the first container.
4. Have your friend start the engine, leaving it at idle in park.
5. As soon as the flow is steady (should only be 2-3 seconds) move the line to the second container. NOTE: If there is fluid spraying out of the transmission SHUT THE ENGINE OFF.
This indicates the test has failed. A small drip or even a few drips out of the trans is normal.
6. Keep the line in the second container for EXACTLY 15 seconds, then move it back to the first container and shut the engine off.
7. If there is at least one quart in the second container it passes and the flow is normal. If there is less than a quart, or there was a spray coming from the trans it fails the flow test.
A failed test means one of three things.
a. There is a restriction in the cooler circuit. This could be a damaged/kinked/pinched hose, debris in one or both coolers, or a damaged cooler.
b. The bypass valve on the side of the trans has failed. Rebuild kits are available. They are inexpensive and easy to install.
c. The pump is worn out. This is not very common, but it can happen.