Never changed one before, I would like to know where it is located.
It's in the end of the intake, where the aluminum coolant tube bolts onFollow the upper radiator hose to it.
According to the national mechanical code, all duct work in an unconditioned space (be it attic or crawl space) has to have insulation on it with a minimum R value of R-8An even better option is to have any metal to metal joints duct sealedThis will allow you to save any heat loss from air escaping from these jointsTo reduce the noise factor from the metal expanding and contracting, this will help, but if you are having problems with noise from the air actually moving through the ducts, the ducts should have been insulated internallyIf you really want to get technical, you can have a qualified contractor come do a PTCS certification test on your duct workBut for maximum efficiency, have your furnace and a/c serviced anualySome of this can be done by you with minimal cost, but it is all time consumingGood luck!
Dudeyou live in FLORIDAWhy do you need to insulate your garage attic anyway? Unless you are going to A/C the garage, insulating it is a complete waste of moneyInsulation stops the passage of heat and heat rises so the best way to keep a garage (or any unheated / un A/C space) cool in a semi-tropical climate is to simply provide a way for the heated air at the ceiling to rise out, and give it a small area of vent near the floor for replacement airflowIn other words, put a ridge vent in and open your garage door a couple inchesYou'll actually feel a breeze! Total costmaybe a hundred bucks for the vent material and a couple hundred more if you need to hire a pro to install it The insulation contractorhe was bending you over, my brother.
