When the aircon is turned on it fails to emit cool air only warm

Maybe you're expecting too much. Evaporative cooling doesn't work really well. It's function depends on evaporating a lot of water into the air. If the air in your room doesn't have a really low humidity (really dry air), then evaporation can slow way down or even stop regardless of how fast the fan is blowing.

bad compressor or capacitor

Full coolant level does not mean your engine cannot overheat. You need to fix the problem as overheating will destroy the engine if not addressed.

The radiator cooling fans must be working, as must the water pump. The thermostat must also be working properly.
There must also be no air in the cooling system as air locks will impair water flow. When cooling systems are drained fully or partially and re-filled air in the system must be bled out using the correct bleeding procedure for the particular engine/cooling system. Failure to do this properly will lead to overheating.

If you ONLY see the overheating warning when running your aircon you need to check that the electric radaitor fans are kicking in at idle when you switch on and run the aircon and the engine has been warmed up some. If they do not start operating when the a/c is running you will get an overheating condition in normal driving conditions.

If the radiator fans are operating normally and you still get an overheating warning when the aircon is on or off the most likely culprit is a faulty thermostat in the engine's cooling system which will need to be replaced.

If you have either a faulty thermostat or if the water pump in the cooling system fails you will get continuous overheating whether the aircon is on or off.

Problem is the thermostat.The heat/cool selector switch might not be making try back and fourth from heat/cool to make a good contact.In heat mode make sure the temp is set LOWER than your cooling temp.If it is too cold in the future just RAISE the cooling temp up and not the heat/cool switch.

Your filter is clogged, causing the unit to oerheat. You need to pull at the top of the vented cover on the front of the unit. It will hinge down and allow access to the filter. Rinse the filter in the sink, and blott it dry between two towels. Reinstall it and you should be fine.

Hello there.. :) your room 30 sq. meters needs 2 - 2hp window type aircon as computed. But you can consider the purpose of putting up the aircon and how many occupants will stay.. :0
For the model:
NATIONAL, 2HP, Model CW-1808VPH 2HP LG Window Type Aircon Manual 2HP Koppel Aircon w/ remote model: KWR-18R1
or check the internet for other models that you want.. :)

Sure, you can get one at http://myminisplit.com

hi there,
insufficient cooling have several reason,most common factor is low freon charging due to service factor,defective thermostat control,dirty evaporator and condenser fin,try to check the current rating using ammeter clamp tester if the rated current read in tester below the rated current on tag(compressor)
you need to charge freon,if the fin and evaporator is dirty need to ve clean,if the thermostat is not functioning replace thermostat.
also consider the main defective if the aircon is running chck the compressor if it is running by touching the tip of screw driver to the top body of compressor you can feeel vibration,if compressor is not running yo don't have cooling effect only blowing of air.on repairing this this should be done by a certified aircon technician,have a nice day fix my rate,thank you very much.

Does your remote have batteries? If yes change them. Somewhere on the unit there should be a selector switch, put it into test and manually lower the thermostat setting

The problems are to numerous to guess. a wire off, a bad control.
I would suggest you return the unit to where you bought it, and get a replacement or in some cases there is a warranty phone number on the paper work you can call. According to the manufacturer they may send a service tech. out to make any repairs. If it's under warranty let the manufacturer honer there warranty. you'll be glad you did.