Just bought the truck. The cabin filters were disgusting. Does not sound like that is that unusual as it is easy to forget about. I will now start to replace relays (L7 first) to see if the a/c kicks up in speed. Sounds like it is going full blast now but there just does not seem like that much air coming out although what comes out is cold. Will the little book go away on the a/c display once I have replaced the correct relay or is there more to the job?