D 350 Pickup L6-359 5.9L DSL (1989)
Thermostat: Service and Repair
Preparatory Steps:
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Drain the coolant.
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Remove the drive belt.
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Disconnect negative battery cable.
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Disconnect the upper radiator hose.
NOTE: Loosen the alternator link capscrew. Remove the alternator mounting capscrew and lower the alternator.
Remove the thermostat housing, lifting bracket and thermostat.
