Ok I'm going to do a few things to get my convertets A/C to work a little better. It just takes to long to cool things down after sitting in the sun all day and it's pitiful when caught in traffic. Thought I would toss out a few things and see if folks have some stuff to add. First thing I'm going to do is insulate all the cold lines. K5NUTT mentioned that in a post as helping. Makes sense to keep it as cool as possible before it gets to the blower box. This is on my 454 dual Air burb. I figure I'm loosing a LOT of cooling on 30+ feet of lines on that booger. On the rear circuit I will insulate the return rout as well . My theroy is it's picking up heat on both lines. That's making the A/C have to work harder. Not just to the excahnge in the cabin but it's probably also causing the preasure to rise in the system making it harder for the engine to pump it. Ok now give me a few ideas of products to use. It has to live under the truck. It has to be impervious to moisture. The cold lines will sweat not to mention what will be kicked up off the road. Right now I'm using either the balck foam rubber stuff you can pick up at most home stores or the stuff that is more of a plastic and less flexible. I think the plastic stuff may have a better R value. Not sure what one will hold up better. I know tha black stuff don't do well when exposed to oils. Also doesn't age well but I don't know if the other stuff does any better. Under the hood I have extra trouble. With the dual Air I have lines fairly close to the exhaust manifold. Anybody have an idea of what to use that isn't going to melt from 500degrees of heat coming off the exhaust manifolds? How about what to use on the drier canister? Also I have heard that often a electric pusher fan helps. My truck has one factory already but I need to fine tune it. No shoude so I know a little bit of aluminum I can probably get 25-30 % better flow out of it. Come on! lets hear ideas. Folks are always complaining about how bad the A/C does after going to 134. Lets try a few tricks and see what we can come up with.