My dad is an old man with a lot of problems goin on right now. When I look after cleaning as much as I could I found some leaks by the fan maybe the seal is bad? But Definitely could be in some other spots too. I am gana try that cleaning trick that the video showed. But I’m also having a valve, lifter or something that’s ticking. I’m a self taught mechanic. Pops wasn’t the best at teaching lol he just handed us tools which I feel is the best way. But I really love this truck and try to take care of it so it will last hell im gettin offers for 3500. Their great trucks but I want t to be all secured. I had a exhaust leak and when I fixed t I actually lost mpg. Vacuume? I pretty much need to do a whole look over on it. I ordered the Haynes Manuel and was also wondering if I can check codes and if so how. The person who had Jt before me messed with the electrical. I would like to fix it. And my only option is having some one on here help when help is needed. (Which is usualy every 2 weeks on that paycheck I just don’t want to see this truck get beat down when it’s such a bad ass truck that can literally do and go anywhere. Also is there things like Pcv valves and other things I should check. Which I’ll knonwhere they are when I get the Manuel. I appreciate all the help. Honestly. This is an amazing site and love that I’m apart of it.