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I have a RB25DET swap in my A31.

Depending on speed and time of day the cabin temperature can be pretty uncomfortable.

At idle, the compressor comes on with the switch however it can be heard coming on and off around approx 2k rpm, I'm not sure if it comes back on higher up in the power band as my exhaust is pretty loud. On highway runs the a/c barely cools the cabin and if I give it a lil go, ~140km/hr it actually becomes warm.

I am using the air con compressor that came with the RB25 and not the RB20 one if that makes a diff.

I've already changed the lines to accommodate the RB25 compressor so going back to a RB20 one is out of the question.

Does anyone have a clue as to what the problem may be? I appreciate any help that anyone may offer.

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https://www.sau.com.au/forums/topic/321599-air-con-woes/
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