i got a 1988 camaro a few months ago i dropped the 305 and put a rebuilt 350 with flat top pistons in it. a few days ago i put flow tech shortie headers with two and half inch exhaust with a flowmaster crossflow muffler i remove the air conditioner box but left the blower motori cover the hole left by the air conditioner in the firewall with sheet metal i checked all vacuum lines they seem to be in place but i have no heater the blower is runnin but no air comes into the what can i do to get some heat?