Air Conditioning - Compressor issues, ofcourse in summer

So i had a service done a week ago, before that the ac worked fine, i live in Southern CA and i like my temp at about 70 degrees, my central air has two pieces of equipment, theres something in the garage, probably the compressor, and theres something in the stairway, probably the fun/blower. when the service tech came out he removed the buildup from the coils in the unit that in the stairway, he checked the freon on the unit thats in the garage, im guessing that the compress is in the garage?

Today i came home for work, the thermo read 79 degrees, its supposed to be cooling at 75, btw once he did the service my thermo reading has always been off by a bit, before when it would always be closer to what i wanted it to cool to, but then again summer is in the 90's now...

finally the issue, about 30 minutes i was walking to the kitchen when i felt warm air from the duct, went in the garage, the compressor was making a strange noise, turned the ac off, figured it had died or that it was over heating, neighbour was out i told her my ac was not giving cold air, she gave me 2 fuses, said that she had the same problem, changed the fuse on the comp and it was fine, so we changed them, turned on the air, it was cooling, maybe 10 minutes into it, i went into the garage to get something and noticed that it was making the strange noise again, went to the kitchen, air was cool but it was getting less cooler then it was back to warm air.

i also notice a change in scent, im guessing that something is going on with the compressor which is why the cool air turns to warm air, maybe the fuse that she gave me are also old/bad? i could go pick some brand new ones but i dont think thats the problem, is it possible that when the service tech was here testing the freon level he messed something up? when he came out for service he shd have checked the fuses and stuff im guessing that he didnt, and hopefully wont charge me for the service call.... the unit is 5 - 10 years old, its eff raiting is 10.5 so its not THAT old, i know its been replaced once, the townhome was built in 1979... any ideas on what else i can check? the AC is off for now, windows open, im going to turn it on again in the eve, time how long it takes to make buzing noise and all that...

Id call the tech back to see what he did.

so i went to home depot, picked up another set of fuses, picked up a new thermostat, came home replaced the items.... its running for now, been 10 minutes... ive noticed that the compressor part is a lot more quiet than it use to, it use to viberate and shake a lot more.... maybe the fan motor on the compress is going out? if there is one? i would think there is one to cool down the compressor? and the compressor is over heating and shutting off? now that i think of it, im pretty sure it has a fan in it., right? hmm maybe this time when it stops cooling ill see if theres any air blowing out from the other side (outside my garage)

so it ran for about 15 minutes and the compressor started making noise, and there was no air blowing out from the back of the compressor, btw if it wasnt clear enough yet, its a Split, air cooled unit? guessing that the air cooled is the compressor part... so either the motor is tripping which makes the compress overheat and turn off, or the compressor is tripping and turning of which is also why the fan turns off, but why does it still make that noise? it feels like its still doing something... its not just an audible noise, its the noise and the low bzzzzzzzzz, i bought this townhome in march, and bought a home warranty with it, includes the unit, costs $55 per service call, so they will be coming out to look, repair or replace the unit,

Zeeomar, this is my first post in here, since i'm new in this forum as of today. Anyhow, i've not had the same prob as you, but i do suspect i have an ailing/aging compressor in my central H&A. For better help, tho, i'd suggest you give more details on the specs of your AC. They can be found on the AC itself, or you may have some info packets on it in a drawer or file somewhere. At any rate, for you, i'd suggest visiting this site http://www.inspect-ny.com/aircond/aircond15.htm that i found last night; it's very comprehensive. Inside you'll find info such as the following:
"COMPRESSOR NOISES - How to Diagnose Air Conditioner Compressor Noises
... We observed unusual noise at the compressor, a condition which could indicate either a service and adjustment requirement, or an upcoming costly repair involving replacement of this component. You should have the system checked promptly by an air conditioning service technician.
... Compressor noise could be due simply to loose hardware such as a loose shipping bolt, tubing, or a broken spring.
... Compressor noise could also be due to refrigerant liquid "floodback" into the compressor crankcase. If this is the problem the noise will appear only at the interval of compressor start-up. That's why it's useful for the inspector to be right at the compressor unit when the air conditioning system is first turned-on. If this is the problem, a crankcase heater can be installed to address this defect.
... Another source of compressor noise include a low oil condition in the unit - diagnosed perhaps by observing evidence of compressor oil leakage on or around the unit.
... Some compressors emit a high pitched noise during normal operation.
... Compressor noises, at least the costly ones, are usually due to a loose connecting rod, piston pin, crankshaft, or other internal part. Since compressors on most modern commercial and residential air conditioning systems are a sealed unit, the only repair is to replace this (costly) part.
HARD STARTING - How to Diagnose Air Conditioner Compressor Hard Starting
A "hard starting" compressor may stutter or begin to cycle-on then stop, then restart. If a compressor is frequently tripping the circuit breaker (or blowing the fuse) which protects its circuit, repair is needed.
Abnormally low line voltage may also be causing a compressor to "hard start".
When an air conditioning compressor has been running it has pumped refrigerant to a high pressure condition in the compressor head. When an A/C system compressor is running and is unexpectedly shut off, perhaps by a human testing a thermostat or switch, if the system is immediately turned back on, some compressors, particularly older window and wall units, may be unable to re-start against this high head pressure. Simply waiting a few minutes for pressures to equalized may be all that's needed. So if the compressor is not starting in this condition we simply turn it off and wait. If this problem is happening often, a service technician may install one of several versions of "hard start kit".
Do not just install a larger fuse or circuit breaker as doing so risks a fire or equipment burn up. Do not bypass fuses such as by installing copper tubing in place of fuses as some A/C service people recommend. This is a crazy electrical hazard risking fire, shock, and equipment burn-up. If new circuit breakers are to be installed to replace an older fuse-protection on an air conditioning circuit, the electrician should remove any obsolete, unused electrical equipment or devices to avoid future confusion or possible shock hazards.
A "hard start kit" is basically a capacitor which gives an extra electrical "jolt" to the compressor motor to get it moving. A starter relay may also need to be installed or replaced. Some air conditioning compressor brands do not usually need a hard start kit. GE, Trane, and Manurope are examples that do not usually take this kit.
A compressor which has difficulty starting might be fixed by installing a "hard start" kit, but depending on the reason for hard starting it's possible that the entire compressor will have to be replaced soon. On a more optimistic note, some hard start kit manufacturers assert that installing a "hard start kit" on a compressor will extend its life. "By assisting the compressor in starting at up to ten times faster than normal, Kickstart? hard start devices significantly reduce the amount of damaging heat that is generated in the motor windings with each and every start. Over time, this reduced stress on insulation, wiring, and other critical components of the compressor has the effect of increasing its reliability and extending its useful life." -- www.kickstartoem.com"
I'm not sure if i recommend that a kickstart kit will help you in your case, and also you need to beware of capacitors in the AC itself, they're deadly. However, visit the site, and you should at least find some info of use.