COOLING SYSTEM - CONTINUED
ENGINE COOLANT HEATER LINES (OPTIONAL) (2)
Route coolant from engine block coolant passages to optional coolant heater, and back to cylinder head coolant
ENGINE COOLANT HEATER (OPTIONAL)
Powered by external power cord connected to external 115-volt ac power source.
Keeps coolant warm during extremely cold weather when engine is not running, to make it easier to start.
To keep things simple, the following descriptions single out related items in the electrical system as separate circuits.
Keep in mind that all of these circuits are interconnected with each other to form the entire electrical system. Electrical
circuits for loader backhoes with Serial Numbers 319995 thru 342573 are shown, circuits for loader backhoes with Serial
Numbers 235786 thru 235999 are similar. See Section XII, Electrical System (page 2-435), for electrical system