Last year during one of several southern California heat waves, my air conditioner decided to call it quits. Not permanently, mind you, it will blow cold air for about 20 minutes and then decide the vents are plenty cold in 85+F weather and blow like a humid hair dryer. It was so bad, that my phone shut off because of overheating and I lost music and navigation. I read online that the compressor clutch relay could fail in Honda vehicles of my vintage, so I tried the cheapest attempt at a solution by swapping out the relay. Nope, no dice. Cold air for 20 to 30 minutes, followed by a blast reminiscent of Dubai in October (100F and humid).
I didn't want to take this to the dealer, because there are no recalls and I just know they'll say it's the compressor which will cost over a thousand bucks plus hours of not having my car available. Well I know the compressor works when the HVAC system decides everything's working, because I'm getting cold air, temporarily.
So I looked up mechanics in my area specializing in air conditioning, and I found this place tucked next to the city of Orange traffic circle (which is really a roundabout now, but whatever). I called Shawn, he said he could squeeze me in to see if the AC is even functioning.
At first he thought, "compressor" and my heart sank. He then quickly said, "Well, let's try evacuating, cleaning, then recharging the registrant, you never know, and the machine will give us clues as to what's going on." So we hooked up the system, and the pressure was way higher than it should be, not a good sign. He ran the evac cycle and recovered about 0.43 pounds of refrigerant when there should be closer to 1 pound. "That's a slow leak," he said. He then ran a cleaning and recharge, pulling the recommended amount into the lines. The pressure was holding, but still a little high at 45 psi (? I actually don't remember the actual pressure units), when the correct pressure should be more like 35.
We fired up the car and the AC, and it started blowing cold air. He recommended that I run water through the grille every now and again, so the hot side would have better airflow and cooling.
The compressor shut off again on the way home. So why 5 stars? I thought at first the issue wasn't solved, so I figured I'll make do with the iffy AC until a couple weeks later when I have time to deal with it. But during my commute today in 90 degree weather, the AC held for longer and kicked back in more quickly without giving up after the compressor turned off. So what might have happened last year and every heat wave: the system shut off the compressor because it was detecting overpressure and the refrigerant was out of spec. But this time the compressor turned back on after a couple of minutes of cool-but-not-cold air, the pressure was lower and there was more refrigerant in the lines. If this is anything like the tire pressure monitors, I would need to drive the car for quite a bit until the system understands that there is the right amount of refrigerant in the system.
So it's not ideal, but it's a lot better than before, and it might even improve as the fresh refrigerant circulates, so that's a win. Thanks Shawn! read more