Just wanted to share my experience with you people regarding AC
My AC was giving tripping problem in slow traffic or very hot sunny day even on fast drive. Which it did not use to do so last year.
It would work for 4-5 minutes then trip and compressor would remain off for next 2-3 minutes before coming back again. It literally dropped all the cooling as blower would blow damp/humid air which would quickly put a few sweat drops on forehead. Provided a car with no proper insulation in floor especially where the hot exhaust route cooks the floor continuously it is understandable. Ok
I went to AC full service costing me 4000. That was evening time when service finished and I drove back home 55Km from my office. AC worked well no trip. Next day I thought to put it into test mode and came out at 2 PM full hot sun sizzling one above at 75 degrees. Issue was still there.. AC would trip after 5 minutes of work, take rest for 2-3 mins and then start working again. Feel like I wasted 4000 for nothing.
I did some research here and there and that is how I pinned the problem down. Few days ago I had a due coolant change. It went well and I refilled with 2.5 bottles of ZIC coolant. Afterwards no heat up signs, no coolant level drop and temp needle would just reach a little below mid mark for the fan to kick in as both my Tsat and Auto fan switch are in place. However on AC, in scorching heat i noticed the temp needle would just reach middle point (though wont exceed it) and remain there all the time while AC was on. That night I jacked up the front of my car, opened up the coolant tank and radiator cap and started the car. I also set the Temp setting towards full Hot (red) to open up heater core in order to activate all coolant passages. Put the car through 3 fan cycles and during this time with a cloth wrapped around my hand grabbed and squeezed both pipes on top and bottom of radiator.
Method as you guessed it right is called Bleeding the air from cooling system finished. Tested the AC next day again in the hot sun around 12 PM. Viola... as I just guessed it car was heating up and electric system was shutting off compressor to prevent engine from over heating. The AC compressor worked uninterrupted on Cool mark despite how much my speed on the road was. I felt good and satisfied but for short time as I felt that even though the AC wont trip now. It reduced the cooling level significantly when car was in traffic jam. Reduced to a level that I wouldn't call it humid/ambient air but still... My temp needle now wont touch the middle mark at all. It would just go near it and drop down on fan action and repeat.
Next day went to radiator change from stock OEM which I was using to new core double column type. refilled with coolant and did an air bleed once again after coming back to home that night. Final test on next day.
Result: After radiator change to double column/pipe the time fan takes to lower the temp needle has decreased. Good logical sign. Feels cooling system is efficient now. Now AC side, compressor wont trip (expected) the AC cooling still drops half way while in start and stop traffic jams. Ok, at time I remembered what the AC mechanic said prior to service. He was like your compressor has completed its life and has reduced oil in it. If you want 100% AC performance change compressor or 80% is enough for you we can still service it and it will cost you.....etc etc