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Old 07-14-2014   #4
PhillipsLT5
 
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Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 2,446
Default Re: Leaking Coolant Overflow Cap

My new & old cap does leak a bit, not really leaking, but evidence of coolant on seam on top of White plastic tank, my friends firebird did the same, I do not think cap is ZR-1 specific, try to run white tank at cold mark when cold, if white tank is filling up and not going back to cold level when cold then cap or head gasket
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