My Ac is always going off within a short time

It sounds like you have a leaking engine cylinder head gasket, the combustion gases are getting into the cooling system and causing an air pocket, this leads to overheating and other symptoms you mentioned.

I suggest you take it to a ASE certified repair shop an have it diagnosed .

depends how you are starting the ac .Always on starting the ac when weather is hot the first step is to start car ac fully down all the windows in order the ac blow push out the hot air in the cabin out and this will also do whilst driving either. When you notice that the air in cabin gets cooler then you wind up your windows. Depends also have the correct gas in the ac system. and the ac temperature sensor works ok.

NO,
replace the compressor only with an original Toyota part from the company Nippondenso only....
everything else is junk....
better change this silly mechanic...

Even though you have a manual HVAC system it still has the capability to set an store DTC'S - diagnostic trouble code's .
DTC B0413 02: Temperature Control 1 Feedback Circuit Short to Ground (CJ3)
DTC B0413 05: Temperature Control 1 Feedback Circuit Short to Battery or Open (CJ3)
DTC B0413 61: Temperature Control 1 Feedback Circuit Actuator Stuck Open (CJ3)
DTC B0423 02: Temperature Control 2 Feedback Circuit Short to Ground (CJ3+C67)
DTC B0423 05: Temperature Control 2 Feedback Circuit Short to Battery or Open (CJ3+C67)
DTC B0423 61: Temperature Control 2 Circuit Actuator Stuck (CJ3+C67)

Did you have Actuator Recalibration done after replacing the actuator or control module ?
Your best bet ,take your vehicle to a qualified repair shop .
Preferred Method (w/ Scan Tool)
Clear all DTCs.
Place the ignition switch in the OFF position.
Install the HVAC actuator.
Connect all previously disconnected components.
Start the vehicle.
With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
Verify that no DTCs have set as current DTCs.

Yours is a new car, so AC should be working correctly. Still you can get it checked at an authorized service outlet. Is cooling sufficient in the summer months? Does AC cut off from time to time, at least when the temperature setting is kept high? If answer is negative to either of these, then get the AC checked.

Also if there is a substantial drop in pickup when AC comes on, get AC checked. According Hyundai manual says that AC should be used at least once a week to keep it functioning correctly. I hope you did that in the winter months.

If AC is working fine, then I suggest that you always keep the air under 100% recirculation (avoid fresh air mode). Secondly keep the AC setting to as high a temperature as is comfortable, and keep blower at minimum speed after the initial cooling is over.

might be the same thing.. but maybe not

personally, it sounds like your IAT (intake air temp) sensor if your dash is displaying incorrect temperatures

If outside temp is less than 60 your a/c should not operate full time and if outside temp is less than 30 won't work at all

sounds like you have a wire shorted in your ac circuit i would get a schematic and trace all wires related to ac operation (remember there is more than one type of short sounds like you have a short to power or ground effecting other circuits) this is a uncommon issue i would look for anything out the norm water leaks or rodent intrusion ...good luck

dont!!! an you start to add freon, itll start to cycle the compresor clutch until within safe operating pressure and then it will hold clutch in constant. charge liquid(with can upside down). if wont take freon in this manner than your more than low on charge. running low on charge will quickly destroy pump, especiallt those old harrisons. the refrigerant also cools the compressor. good luck and wear gloves-

I got a bigger coat to wear! while I find time to look into it further. I appreciate knowing there is more help available and will try the Primo Asist plan later. thank you louie