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Project Large Marge: Easy Air Conditioning Installation in a 1973 Mustang
Installing Classic Auto Air’s Perfect Fit Air Conditioning System: How it works and how to install cold air in Project Large Marge
We’ve spent so much time on the undercarriage and suspension of Project Large Marge that we wanted to change things up this time and move inside. Marge’s interior was completely gutted to prepare it for the roll cage installation and while we had the dash out of the car, it was a perfect time to install an aftermarket air conditioning system.
We chose the Perfect Fit system for the 1971-1973 Mustang/Cougar from Classic Auto Air. This system was designed specifically to bolt into a Mustang or Cougar with minimum hassle and modification and provides cold air out of the dash vents, heat on the floor, and dehumidified defrost. It completely replaces the original heater/ac components for a cleaner look and modern electronics replacing all those troublesome mechanical levers and vacuum tubes. The monster evaporator under the dash also moves a ton of air, so it’s guaranteed to keep the interior cool even on the hottest days. Those of you in the South can certainly appreciate that.
In this video, we go into how the system works, how to calibrate and bench test it before going in the car, and finally how it installs under the dash. Because the engine is out of the car, we haven’t yet finished the system off with the addition of the compressor, water hoses and everything on the engine-side of the firewall, but that’s to come when we address the engine installation.