Central air conditioner compressor (which is only a few years old) trips circuit only on very hot (90-100 degrees) days.
System is on a timer to "cool" house weekdays 8:00AM-6:00 PM to 80 degrees, then, back down to 74 degrees in the evenings.
Circuit always trips when we are not home at some point during afternoon, when it’s supposed to be keeping 80 degrees.
A/C technician has confirmed entire system, compressor are all ok……. electrician claims he can replace the circuit breaker, but, that may very likely not be the problem since this is the same circuit we have had for 20+ years, and for which my prior 19 year old AC compressor never tripped. Problem only started happening this season on the 95-100 degree days in the middle of the day (when we are not home), so we walk into 90+ degree house at night.

I have a 2005 Maxima SE and the A/C is blowing hot air. I have recharged it twice and it’s not holding a charge. I took it to the shop and they found a leak in the low side hose, and I had them replace it. They recharged it again and blew slightly cool air (not cold air like it used to) for a few days before it went back to blowing hot air, and the guy at the shop told me that the compressor was on its way out. He also told me that if you replace the compressor you need to replace the expansion valves and dryer as well.

I spoke to another mechanic who said as long as the compressor isn’t locked up then there isn’t a need to replace the other two parts.

Whose advice should I take, and is replacing the compressor something that I could do myself?

My Air compressor tank is all rusted out and leaks pretty bad, but the compressor it’s self is fine. I’ve been trying to find a new tank for it, but I can’t find ANYWHERE that sells just the air tank. Every only sells the tank and compressor combo. I just need a tank! Where could I get one? I need a 60 gallon or bigger. No, I don’t want to use an oil tank. I want an air tank. Any help is appreciated, thanks.
I don’t know why I posted this in home and garden. Sorry.