My Myvi aircond just done refilling gas a week ago

Then I notice when idling at hot weather, the air cond compressor turn on and off randomly and then the air cond becoming warm until the car is moving at around 50km/h then the cold air is back

The randomly Aircond compressor On and Off is very quick, its like 1st second it turn on, then 2nd second it off, then on and on for few times and it totally went off

I've checked the temperature it seems normal all the time.

I suspect the air cond compressor went overheat and cut off... is there anything I can do with this? Radiator fan seems working good with strong wind

This post has been edited by mywingame: Jul 27 2016, 02:16 PM

relay kong or thermostat kong

also, when u refill a/c gas, didn't they check oil level for you too?

No.. they didn't check...

Is there a way to check this? Because long ago I met a mech who ask if I need to top up compressor oil, I ask him left how much and he say we wouldn't know, I end up didn't top up cause that statement sounds vague..

Anyone else can help on this?

Just change the oil and see how it goes.

Ok, well noted.

Thanks for your advise

could be overfilled refrigerant/gas, causing the pressure too high when the car is stationary (less flowing air to cool down the heat)... just my guess.

I kena before similar symptom right after refilling. my car not myvi though.
the technician refilled too much gas. pressure too high. the compressor had to frequently cut off even though not cold.
sent to another technician, released gas back to normal pressure. no more issue

That sounds pretty simple, I'll give this a try first

The amount of refrigerant to be refilled into any air con or refrigeration system is measured by weight. Its not by litres or by some pressure measurement. Mechanics use their experience and estimation to what is sufficient. The sight glass at the receiver dryer is only a fair indication of the amount contained. Air con system is also a calculated balanced system of evaporation and condensation. Overfilling or underfilling can result in numerous symtoms of operational defect including compressor malfunction and "not cold". Mechanics can make mistakes to overfill refrigerant especially on complaints of not cold. Refrigerant don't leak out or empty itself unless there's a leak. Its a sealed system as always. In your case it could be a case of fan coil is dirty or need a total washdown, including possible defect of the thermostic control components. Insufficient cooling is also a result of dirty fan coil, where the coil can freeze up, cause the thermostic control to cut off compression on & off (when its melted down) As I said, its a balanced cycle system. Inbalance anywhere cause the thermostatic or protection controls to activate. The same apply to any room airconditioner too...just that its compressor operate on electricity, not car engine.

This post has been edited by bsl555: Jul 27 2016, 05:14 PM

Thanks for your clear explaination on this, will take note.

I was informed by Scottie Kilmer, a famous youtuber with 43 years experience as a mechanic. He said that car airconditioning system will leak a little bit of refrigerant over time through the compressor seals. It's just small leakage so over time, car AC system will need to be recharged.

I did recharge my AC after 4 years & it is obviously cooler as compared to before recharging.

Overfill...my truck got this issue last few month ago, solve after release gas.

How much of leak over 4 years vary from car to car and subjective. If its felt warmish after 4 years and a recharge made it good again, it simply means a lot have leaked out, even to the point of depletion or lowest permissible gas discharge pressure. Any lower pressure and the low pressure sensor will activate and stop the compressor from engaging.