wolfe10 wrote:
There is a difference between a low coolant light (i.e. level in the reservoir is low) and low enough that there is an air lock in the thermostat housing.
If the latter, do NOT start the engine until it is addressed. Hot air will not open a thermostat and you could crack a head.
Getting rid of an air lock really depends on how the chassis is set up. Some have a bleed hose from thermostat housing to reservoir, some do not.
On our last coach, I had to loosen the coolant line that went from the thermostat housing to the air compressor to bleed out the air.
On some, it is better to remove the thermostat housing and fill SLOWLY until the coolant is right up to the thermostat level.
I suggest you check for the specifics on your chassis/engine.
I need to pick up some more coolant today and then I'll work on this tonight. What I'm not clear on is how to tell if I have an airlock or not. My plan is to fill the reservoir (which is low now) and see if it drains.
Any thought?
