[BILL WILLIAMSON]

Originally Posted by Mitch//pa

a blown head gasket can cause overheating the combustions gases introduced into the system causes aeration. but have found many head gaskets faults are from restricted radiators which are overlooked
you can also invest into a hydrocarbon tester they do come in handy

In lieu of a hydrocarbon tester, get used to what your filler neck odor is, get yo' nose down in & SNIFF, deeply, with engine warmed up & running. THEN, IF you get a combustion leak, you CAN smell the difference! And if you sniff a combustion leak long enough, you can almost get "GIDDY"! Sometimes, a FEW bubbles can be misleading. Maybe I'll train the Dog to be my "SNIFF-O-METER" (That's a registered trade mark!)
Bill W.