general rule of thumb for pressure is - low side should be half of ambient, high side should be twice ambient with the compressor running. so if outside temp is 70, low side should be around 35, high side around 140psi.
its possible if the refridgerant level got low enough, it may gone into suction on the low side and drawn in some air which would make it less efficient.
also the compressor should be cycling on and off every 30-45 seconds with a normal charge.
best thing to do may be to have a shop recover whats in there, draw a good vacuum and refill with the proper amount.
maybe add some uv dye in case there is a leak, it can easily be traced.
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2008 suzuki SX4 sport sedan 5spd FWD
2006 suzuki boulevard C50 SE
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