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Discussion Starter #1 (Edited)
I have a problem with the air-con, I have read most other air-con threads but no one seems to have the same symptoms as me.

I recharged the car last summer as the gas was so low that the compressor was refusing to turn on and was making a hissing sound when it did. All was good that summer. For most of the winter, I tried to turn the AC at least once every two weeks and sometimes would leave it on auto. Summer comes again and the performance is only mediocre. Now, I know you would immediately say that gas has leaked but that's not quite right.

Back when I was fixing the AC I bought a probe thermometer so that I can be more precise in determining the temperature of the air. Immediately after recharging it would easily provide 4.5° at 2k RPM set on Lo and recirculate air. This would drop even further if the solar sensor detected bright sun.

Two weeks ago I managed to get 6.5-7° at the same settings. However, I noticed that the AC seems to have a mind of its own. One day after just turning the car on, still with hot air inside, it managed to pump 2.8° into the cabin right away.

Today the lowest I managed was 18° i.e. nearly no cooling. The only mildly cool air would come from the right middle vent, the others were distinctly identically warm. I have three relays which I accumulated over the year and all work fine. The compressor turns on, it makes all the right noises.

What bothers me is that I know that when it wants to the car can provide ice-cold air, it seems that I can't control it though. Any advice? AC specialist, recharge, new condenser/compressor?

EDIT: I managed to run AC diagnostics - here are the results.
1 - 34 - Cabin temp
2 - 19 - Exterior temp
3 - 59 - Solar radiation sensor value (SUNNY)
4 - 29 - Temperature of the air exiting the air conditioning evaporator (A bit too high?)
5 - d9 - Drivers air mix opening
6 - 00 - Passenger air mix opening
7 - F0 - Mode positioning % open
8 - F0 - recirc flap % open
9 - d8 - vent output air temperature (It's not 8°! It was 20°C)

88 - no errors...
 

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i-Vtec
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2,560 Posts
Yes. With the recric button on you are recirculating the cool air in the car so the AC should also get colder quicker as its not bringing in the warm air from outside. The AC system then removes any moisture in the air so your windows dont steam up.
When its not getting cold, like today, is the compressor definitely turning? On a day like today mine wouldn't work due to the Shim on the compressor expanding. I swapped mine out for a thinner one and its worked perfectly ever since.
 

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Discussion Starter #5
Yes. With the recric button on you are recirculating the cool air in the car so the AC should also get colder quicker as its not bringing in the warm air from outside. The AC system then removes any moisture in the air so your windows dont steam up.
When its not getting cold, like today, is the compressor definitely turning? On a day like today mine wouldn't work due to the Shim on the compressor expanding. I swapped mine out for a thinner one and its worked perfectly ever since.
It is definitely engaging - confirmed with a visual check as well. I can hear the distinctive click, the fan on the radiator turns on, the clutch spins. As much as I don't want to admit it it probably is something to do with the pressure or lack thereof. I had the idea of throwing a new condenser in it just to see if it will help but no point really as could be a million things. Perhaps it's AC specialist time...
 

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i-Vtec
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No point in putting on a condenser in without knowing where the leak is in the first place. Could be something as simple as the Schrader valves on the High and Low pressure lines.
 
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