I had a shop miss a cracked cylinder wall many years ago, and it acted just like what you are now putting up with. If you can find a smog shop willing to wave the sniffer tube that samples exhaust gas over the filler neck you will have an immediate answer. There will be no reading from steam even with the antifreeze mixture. If there is exhaust gas escaping the meter will climb right up.
While I drove to the smog shop and waited for the engine to cool down so I could pull the radiator cap, I really don't see why waving the sniffer over the overflow tank wouldn't give good results.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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