occasionally car runs hot,coolant bubbling in overflow only after 20 or 30 minutes of highway driving.drive all day on backroads no prob.new 3 core rad.,waterpump,192 ford t-stat with bleeder,new fan and fan clutch.has the spoiler under bumper. i know theres a machine to sniff exhaust gasses but also heard you can buy test strips that will show presence of carbon,exhuast gases in radiator.. anyone heard of this and where can i get it. suspect i may have a slightly weak head gasket. auto zone doesnt have it.
90 7up 5.0
90 7up 5.0