My 95 GL has the same hissing cap. It allows preasure to blow off and not stress the system so much. Mine never boils over and its the origional.
95 Contour GL. Bought new.
BAT Sway Bars/Pioneer CD/Koni Rear Struts/Mobil Fluids.
Looking for 15" alloy rims-PM me.
180,500km's so far.
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