you can get thermostats that fit into the top hose, I also drilled and tapped the water pump housing to take a 1/2″ hose adaptor which feeds the cab heater, with a stat fitted it speeds up the heater output as its not circulating around a cold radiator until stat opens.
Nigel
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This reply was modified 5 years, 7 months ago by Nigel Watling.
Nigel Watling