I got the 2 keys cut by the local hardware store. I ordered the blanks on line. No local locksmiths.... Top front hose does get hotter than the rear hose. I blew through the heater core with the air compressor. Flows better in reverse than normal flow. Truck comes up to heat normally. Do they all come with a restrictor in the in flow line? I have not seen this before. I wonder if I should remove the restrictor. I assume it's stock??