Webthe apu starts if the battery voltage goes below the level you specify here. Setting the voltage level notice factory default voltage setting is 11. 8v. Range is 11. 0v to. With the apu and truck engines running, open the thermostat bleed valve and let any trapped air escape until a steady stream of coolant flows from the valve. Webthe truck must be equipped with a minimum 240 amp alternator. This guide has been prepared for the operator of carrier transicold comfortpro electric auxiliary power units. The checks outlined in…