hey guys...i have a question...my camaro will only blow warm heat when im idiling but once i move it blows cool air...any clues whats wrong? also i took my car into autoshop today to learn that my shuddering when braking is due to my worn rotors and my pads are getting pretty low. now it looks like im in for 4 pads and 4 rotors...do any of you have tips where to find the cheapest but are fair quality brake pads and rotors for the a 94 Z28? thanks for the help in advance.