Don't pay any attention to that, Misty.
Honest, if you do a little reading in the service manual, understand what kind of a system you are dealing with and the symptoms you are experiencing, then you can talk the service writer's language.
When you get there, explain your problem, then tell the service writer that before they go forward with any repairs, you want to know what they found as the problem, what they are going to fix and what they will charge BEFORE they do any work.
That way, you now know what to expect when you go to pick up the truck. Don't be afraid to ask why they have to repair or replace a certain part. Just ask questions so you understand what they are doing. Asking intelligent questions shows the service writer you aren't just someone who smiles pretty.
Then, when they tell you it's done, test it out. Start the truck, turn on the heat, let the rig warm up and check it. Don't leave the lot.
If you are not satisfied with the results, walk right back in and let the service writer know the problem is not resolved and they should check the truck system again.
Merry Christmas to ya and good luck with the repairs!