the temps on your a/c usually come down to under 6degrees when the compressor is on and when the compressor cuts out it will usually come back up to about 8-9 degrees. try putting a digital thermometer at the centre vent. switch the a/c to fan speed 2 and on re-circulate, if you can close the outside two vents.

if the temp doesnt get below 6 degrees then you probably need new gas.

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2013 Toyota Hilux 4x4 - Weekender
1991 Mazda MX-5 - Fun