Hey guys.
Problems I've identified:
1) Mine has a leak/failure somewhere. Thats fine. I've put dye in the system and topped it up after previously vacuuming it and gassing.
2) Once filled to the right amount, its still not ice-cold.
So what is the next item to check?
What are the known problem items in this system?
The clutch engages the compressor. The fan works on all settings.
Its just not as cold as it should be once its gasses up to the right amount.

Is there some type of sensor picking up the temp and not functioning properly to cycle the compressor clutch?
Or is is the expansion valve?
I dont think these compressors have an a/c solenoid valve in them which can fail like on most Euro cars and Nissan Sentra's/Altima's.
I know the lower section of the condenser has the fins all bent. I could try to straighten these with a nail file but I'm not sure I could lose THIS much cold, through that bottom section of the condenser.... or could I?
The condenser's flow from the top to bottom.
Is there anything else I could be missing? The system used to work just fine and cold previously (since the vac and gassing back in October last year).

 

What are the pressure readings , both high and low sides ?
Also, what is the ambient temp and humidity when you take the pressures ?

 

Hi,

My 2010 is having the same problem with A/C suddenly losing coolness. However, I don't have the ability to diagnose it myself, as West Aussie and firemangeorge do. Do I need to take it to my mechanic? Does anyone have a ballpark estimate of how much the diagnosis and repair would cost?

Thanks!

 

Yes. Find a repair shop.

Cost ? Hard to say. As little as $100. Much higher if you have to replace a bunch of parts.

 

Than you!

 

I would scan the condenser with an IR thermometer. You may have a restriction in it.

 

Mode door? Sure the mode is set to "in your face", heat turned to full Blue not in the middle (my wife thinks that is AC), blower on. Not in recirc. Check cabin air filter/check for obstructions.
If the clutch is engaged and turning the compressor, why are you worrying about valves and switches? The pressure switch will turn the clutch off if low pressure.
Go to the local auto parts store and get a fin straightening tool. If they are bent there is a good chance of a leak or obstruction.

The heater core is always hot, the temp knob controls how much air flows over it. Air always flows over the AC evaporator.

 

Hmmm ? Wonder if the OP is going to come back and update.

Edit: I see he did come back but didn’t respond…..Oh well.