Just replaced the start capacitor on the A/C condenser unit.
Came home to a hot house. Went outside and could hear the compressor trying to start, then shutting down. Unit was hot, no fan running.
My first inkling was "fan problem", but the blades spun easily. Read here and elsewhere about the common capacitor issue. Took a look and sure enough the capacitor was "puffed out".
$20 later and 10 minutes of labor, it is working like a champ. Easy repair, you just have to take precautions for shock, discharge, etc.
Now I think I'm going to prophylactically replace the cap on the other unit.
Good idea. Though I think I will just buy the capacitor for mine, and have it on hand in case a replacement is needed. I might never need it, but not having to wait for shipping will be worth the $20 or whatever. Could save me time and several hundred $ service call.
Related to this, I did just have my 24 YO A/C serviced (first call ever). Though this wasn't a DIY repair, I had recently researched this as my DD had her A/C freeze up, and I was checking things with her before we decided to have her call a service guy.
What I learned was that as the refrigerant gets low in an A/C system, there is a point where the low level results in more expansion than it is designed for, and the inside coils get very, very cold. This leads to the humidity freezing on the coils, rather than just condensing and dripping off and down the drain as designed. The frost layer insulates the coils, so they get even colder, and pretty soon you have so much ice it is blocking the air flow, and the cold travels up the pipes back to the compressor with frost all the way back. DD said the service guy just added refrigerant, though I know they are supposed to check for leaks, so we will see if it lasts.
So last Saturday, I wake up, and the A/C cycles on a little later. But something must not have sounded right, because I checked the vent for air flow, and it was near zero. Since I just went through this with DD, I realized we were frozen up. I had commitments that day, so called the service guy, we told DW to turn the A/C to "OFF" ad the fan to ON so that it would melt the ice build up. Guy was out by noon, 2# of R-22 - he said there were no caps on the valves... hmmmm. But only $174, and on a Saturday, and quick response, and it worked over the next few days heat wave, so I was happy - at least short term.
It's my understanding those are dust caps, and not meant to seal. They should be there to protect the schrader valves (like tire valves). I checked today, and while that's true, there are caps with o-rings, and I guess that should be a back up. I took one cap off today, it did hiss a bit, so I suppose that schrader valve is leaking a bit. The cap does have an o-ring, so I replaced it and checked for leaks with soapy water, and I think it's good. I guess I'll just keep my fingers crossed that this keeps it running for a few more years (due for a replacement, furnace is just a few years newer).
-ERD50