I have a problem with the AC.The compressor does work properly on idle, it turns on and off all the time. And it makes the engine to hesitate, rpm are dropping while the compressor is turning off and on, and doesnt blow cold air.
Immediately when I put some gas on the pedal and stay like that or i am driving, the compressor is working and blows cold air.

I went to 3-4 AC specialist and all told me that the ac system is ok, doesnt leak, i have a freon etc... and that i have electrical problem so the ac compressor doesnt work properly od idle or low rpm...

So do u have any ideas?

You went to 3-4 air con specialists who couldn't tell you what the problem is.......

And you thought that what 3 - 4 air con specialists couldn't tell you, some bloke on the internet would have an answer for you.




Well it's pretty simple and does not take an aircon specialist, your aircon is low on gas and it needs a refil, what you describe is 100% indicative of low air con gas (freon is a CFC and was banned in the 1980s so I strongly suspect your car had non of it in the system to begin with. The 3 or 4 aircon specialist should probably have known this)

Not having refreshing cold aircon is a sign of low gas
or a Water trap 'The humifier' is full and needs replacing

The gas on the punto's is R134a, not what ever your saying

The pump will yet keep clicking on and off
Even with a full charge, the ac pump doesn't need to run all the time
as the pressures in the system constantly change the high pressure switch activates and the pump shuts down as the pressure drops again - but the air been blown is still refreshing cool

if the pump works for a few mins only - and then drops of for ages - this is low gas cut off - A Drain - Vaccuum test - Refill with correct oil and gas content is gonna be part of the diagnosis path

Ziggy

This is all happening while the car is idle...

The compressor is turning off and on frequently only when car is in IDLE. And it makes the car to run rough only at the moment when the compressor turning off and on the rev drop to 0.5 rpm and comes back. And doesnt blow cold air on idle.

Bumb said:

This is all happening while the car is idle...

The compressor is turning off and on frequently only when car is in IDLE. And it makes the car to run rough only at the moment when the compressor turning off and on the rev drop to 0.5 rpm and comes back. And doesnt blow cold air on idle.

Click to expand...

Yes, the other posters understand your problem is at idle and their answers are accurate.

I doesnt get the solution...

I just 4-5 days ago refield with correct freon r134a and oil as mention above, and checked for a leaks.

So i dont get the solution...

I understand that the pump doesnt need to to work all the time, but when is doing that the car obviously has a problem, doesnt run properly, it hesitates on idle, the revs are dropping as i said in the moment when compressor is turning off and on.

Well either, they didn't fill it with the correct weight of charge or the leak test although unable to find a leak, doesn't mean their wasn't one.

Also if the system has been out of gas for a very long time and sat unused, it's quite possible the compressor is seizing up hence the very poor idle when the clutch kicks in

Yes i didnt use the ac for 2 years for sure...

If the compressor is failing then it will eventually snap the belt with the 1.8 this has had implications on the timing belt as well, can cause damage and tangle.

I would go back to your air con specialist asap

Or are we looking at this wrong and that the ac is working fine and the car isnt responding that well

Id expect a non canbussed aircon system to have a slight change in rpm feel as the ecu has to detect engine load before reacting

In canbus'd or smart systems the controller can say aircon on in 2seconds raise rpm

I wonder if your throttle body is blocked partially and the idle control valve isnt oepning quick enough due to gink?

Thay way when the engine loads hits hard, the engine isnt able to breath as there is a lack of air flow, hence the drop before the idle control vaove catches up?

Remove and clean throttle body

Ziggy

Ziggy122 said:

Or are we looking at this wrong and that the ac is working fine and the car isnt responding that well

Id expect a non canbussed aircon system to have a slight change in rpm feel as the ecu has to detect engine load before reacting

In canbus'd or smart systems the controller can say aircon on in 2seconds raise rpm

I wonder if your throttle body is blocked partially and the idle control valve isnt oepning quick enough due to gink?

Thay way when the engine loads hits hard, the engine isnt able to breath as there is a lack of air flow, hence the drop before the idle control vaove catches up?

Remove and clean throttle body

Ziggy

Click to expand...

That would be my take on it for sure. Especially if each AC expert the OP has been to says the AC system is fine (after checking gas level, leak check etc).

Ziggy122 said:

Or are we looking at this wrong and that the ac is working fine and the car isnt responding that well

Id expect a non canbussed aircon system to have a slight change in rpm feel as the ecu has to detect engine load before reacting

In canbus'd or smart systems the controller can say aircon on in 2seconds raise rpm

Click to expand...

Given the RPM reportedly drops to 500 when the compressor kicks in and the car has sat for at least 2 years without any gas (or ?oil) and not in use.

Indications are good that the compressor is knackered.

But why when i press the gas and stay like that on 1500 rpm for example there is no problem.

The answer to this is contained within the posts above, if you're low on Gas by Rev the car then there will be an increase in the cooling effect even if the gas is very low, until the gas all leaks out. This has been explained to some degree above. You can't fix this problem yourself and you very much don't understand the issue and without explaining the entire workings of an air conditioning system you're probably not going to understand.

Take it back to the specialist who regassed it and let them look at it.