I have a 99 chevy silverado 4x4

Question edited for clarity.

Cooler lines

https://www.google.com/search?q=2005+chevy+silverado+1500+transmission+cooler+lines

Vacuum Lines

https://www.google.com/search?q=2005+chevy+silverado+1500+transmission+vacuum+lines

Videos

https://www.google.com/search?q=2005+chevy+silverado+1500+replace+transmission

images

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Sounds like the blend door is not moving. Most blend door actuators are located on the bottom of the heater box near the middle of the car. If the temp control is a round knob, it is an electronic actuator.

Don't drive a Chevy they are unreliable and are unpredictable.

The small hose on top goes to your overflow reservoir.

never knew 4x4 had a chain inside the box ??

there should be one small hose going to the radiator from the resevor thats if the radiator has a cap on it if not then there will be 3 hoses two going to either the motor and the radiator and one that just hangs down so if any over flow from the radiator does not blow all over the motor.

you can buy a chilton or haynes manual at a parts store, or on ebay. Sometimes on ebay they sell the diagrams that are emailed to you in an ebook as well..

I don't see you did anything wrong per your description.
With the engine off, check the level of the transmission oil, replace the dipstick, start the truck and recheck the fluid level, level should drop. This will indicate the front pump is working.

Next, with truck running, put transmission into any gear, then return to park position. Do you hear any ratcheting noise.

Let me know.
Regards,

There should be a tag on the rear that tells you the weight. It is probably sythetic oil. If there is no tag, call any Chevy dealer, ask for service dept. and they will tell you.

That hose goes from the coolant reservoir to the radiator, just under the cap. It may have a connection in between, but that is where it ends up.