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Once you have the hoses installed, clocked, and routed to your liking, ensure all openings in the firewall are sealed. The air conditioner will be more efficient with less chance for hot air to get in, so check things like door seals, glass adjustment, and so forth. Even consider tinting your windows to help the air conditioner's output. The Vintage Air kit includes a roll of press tape, mainly to keep the #10 suction line insulated as shown here, but you can use it to seal the heater hose fittings and other small holes as well.