Fixing AC. Problem is Ambient Temperature Sensor (code: 21). Confirmed Short in wiring... Help find short point!

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Hello. I determined my AC problems are tied to a short between the Climate Control System (Auto Amp) and the actual connection at the front of radiator. I tried replacing the harness at the Ambient Temperature Sensor point with no success. The short is somewhere between the the Ambient connection and the Climate Control connection. I was able to bypass the wiring and connect the Ambient Temperature Sensor at the Climate Control Harness just to get the AC up and running.

Any ideas on points between the climate control and the Ambient Temperature sensor that could be a possible cause for the short?

At this point, I'm tempted to run 2 wires all the way up there and call it good to bypass the stock wiring but figured I'd throw it on the forum for some advice.

Thank you!