Coolant is in radiator only, have no idea how old water pump is. and will change thermostat this morn. Engine was not to full operating temp due to fear of burns. I was just trying to see if there was a major difference in comp on any two adjacent cylinders or if I could see compression loss on the guage. If it were a blown head gasket why didn't the guage indicate that? Could a cracked intake cause this?
