Air bearings/spindles, slides in total will use a fair amount of air. Using that much air will cause the cooling effect that you have described. Due to the amount of air that you are using, heating the tank or lines will have little effect. You could even heat the tank with a torch and have only a marginal increase in temp. From your description it sounds like the compressor is outside and so is it's intake, sucking up all that cold air. The compressed/heated air is being fed into a cold tank and pipe.
If you can move the compressor inside or at least run a hose from the intake to the inside where the air is warmer or bring the high pressure line inside right after it exits the tank, don't let it run up the wall outside.
Last resort, get the liquid cooling working again and run warm water thru it but that would only take care of the spindle and not the slides.
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