Originally Posted by DAVEHOLMAN
So, the lines to the heaters have valves under the hood. Is it sufficient just to close those valves, or should I loop one line back to the pump so coolant will continue to circulate?
are you taking out all of your heat including your defrosters?
you can loop that line, however the busses were made to run with those valves closed in the summer time.. some schools Masked other cooling system deficiencies by leaving those valves open.
in a normally equipped bus that meant there was another few gallons of coolant ot heat up as a ballast.. so when you close them, test drive your bus to make sure there are no other cooling system issues..
if you are leaving some heaters you will need to leave those valves and the lines going into that part of the cab.