bubbles in expansion tank
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If bubbles in the tank - there is a chemical test for exhaust gas in coolant, about $50 at NAPA, will do maybe 15 tests. HG could be OK, but could be cracked block or head. Bubbles need to be purged no matter what the source, air in system does not cool as well as coolant with no bubbles.
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We have two different kinds of testers in the shop and sometimes we will get negative results and the gaskets or liner will still be bad.
The last one we did gave us a the results for a bad diesel head gasket in a gas 4.6.
#10
I don't think I've got any problems. I was tempted to run the test because it was free.... but I figured that since I don't think I have problems... I shouldn't try to prove myself wrong.