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Ray: If you did have an air bubble in the system, it was probably caused by the coolant service. The coolant drains out easier than it reaches all parts of your systems during re-fill.. Please check your coolant level in your coolant tank. After my coach purged it's air bubble after water service I had to add three gallond of coolant. Glad to hear your under way.
Jon: I liked your sustem of water service. Thanks.
Hi Harry,
In my particular case it was not an air bubble, but the return solenoid which is normally open (bypassing the engine), wasn't open. This meant there was no open path for coolant to move through the system, and the coolant boiled in about 60 seconds, causing a thermal shutdown.
I had first thought it was a an air bubble in the line from a coolant change, but determined if I hit the dash switch to pre-heat the engine (which swapped the two solenoids), then the heater would run, i.e. the path was open.
Removing the valve guts is a simpler solution, and was suggested by Marathon.
Ray
Good remedy Ray. Thanks for the follow up, now we all have that avenue to follow. Glad your on the road again. That cold weather has got to be tough on a SoCal boy. Safe Journey's
We'll see you out at Havasu!!
Ray