Putting A/C into a non A/C 03 Tacoma

Yeah that's gonna get expensive, especially labor.

That being said, install the components yourself and pay a shop to charge the system with R134A.

 

Ayo do you see the two holes if you zoom in? Maybe they were plugged? And why wouldn’t I of had it if there’s a fuse? Maybe another clue.

 

Even if you did have AC at one point, all the important parts are missing. The lack of the ports on the firewall indicate you’re missing the Evaporator or the correct air box inside the cab. I can see the two holes in your picture where the ports are supposed to exit the cab, but it’s blocked off with rubber plugs indicating there is no evaporator. The biggest telltale sign your truck did not have factory A/C in the blank button on the HVAC panel.

In addition, you have the wiring and fuses for a lot of things that aren’t in your truck from the factory. This is normal in the car industry. It’s simply more economical to use a harness or fusebox that covers all features rather than make a specific one for each trim level. Keep looking, you may also see a 4WD fuse and a RR DIFF LOCK fuse that isn't utilized on your truck.

For example, your truck is pre-wired for cruise control evident by the bracket and harness. However, you can see it’s not there. This would've been installed at the port, or dealer in some cases.

 

Appreciate the help brotha cheers.

 

The wire harness variations can get crazy. I was involved with an effort around 2015 to try to reduce on Highlander. Between RH/LH drive, Hybrid/non HV, and all the trim packages, we had gotten to well over 100 variations of engine wire harnesses.

It gets to the point that even in storage space alone, forget labor to manage them, it becomes cheaper to have give away circuits. Toyota has always resisted give away circuits more than other manufacturers, but there comes a time to say no to designers.

 

100? Wow. That’s nuts.

In my old 5-Lug Tacoma, it had connector (BN1?) under the driver’s seat for the rear diff locker which was kinda funny. It was like a 20 pin connector and only one pin was being used for ground.