Frontier AC Problems

I also own a Frontier, though not the same year, and your AC symptoms sound very familiar to an issue I had. Does it make any strange noises when you try to turn it on? My AC efficiency was also terrible before it finally gave out. Have you noticed any signs of a refrigerant leak, perhaps an oily residue anywhere around the AC components? It could also be something simple like the AC relay, or perhaps even a problem with the temperature control unit. Have you tried any of these troubleshooting steps?

Thanks for the quick reply! No strange noises at all, just complete silence. I haven't spotted any oily residue, but honestly, I wouldn't really know where to look specifically. Where exactly should I be checking for a refrigerant leak? And how would I test the AC relay?

Okay, silence is interesting. As for the refrigerant leak, inspect the connections and lines of the AC system under the hood. Look for any signs of oily residue, as that often indicates a leak. Regarding the AC relay, you can usually swap it with another identical relay in the fuse box (horn relay, for example) to see if that fixes the problem. However, considering it's completely silent, and given my past experience, it might be individual valves within the AC system. I strongly suggest taking your Frontier to a reputable workshop for a proper diagnosis. I ended up paying around 1000€ to fix mine.

Wow, 1000€! Okay, that's a bit scary. I will definitely take your advice and get it checked out by a professional. I really appreciate the insight! Knowing where to start and what to potentially expect helps a lot. Thanks again!