my a/c went out first.then my van started overheating. if is fan how can i fix on 2003 Chevrolet Venture

a/c comes on only blows hot air. my temperture reads half in the guage of cool & hot. engine running poorly. but all fluids are still in radiatar. but when cooled down & you take cap of radiator fluid comes pooring out.

Asked by for the 2003 Chevrolet Venture