D 250 Pickup L6-359 5.9L DSL (1992)
Thermostat: Service and Repair
Removal
WARNING: DO NOT LOOSEN THE RADIATOR DRAINCOCK WITH THE SYSTEM HOT AND PRESSURIZED. SERIOUS BURNS
FROM THE COOLANT CAN OCCUR.
NOTE: Do not waste reusable coolant. If the solution is clean, drain the coolant into a clean container for reuse.
1. Disconnect both negative battery cables from both batteries.
2. Remove accessory drive belt.
3. Drain cooling system until coolant level is below thermostat.
WARNING: CONSTANT TENSION HOSE CLAMPS ARE USED ON MOST COOLING SYSTEM HOSES. WHEN REMOVING OR
INSTALLING, USE ONLY TOOLS DESIGNED FOR SERVICING THIS TYPE OF CLAMP, SUCH AS SPECIAL CLAMP TOOL
(NUMBER 6094). SNAP-ON CLAMP TOOL (NUMBER HPC-20), OR EQUIVALENTS MAY BE USED FOR LARGER CLAMPS.
ALWAYS WEAR SAFETY GLASSES WHEN SERVICING CONSTANT TENSION CLAMPS.
CAUTION: A number or letter is stamped into the tongue of constant tension clamps. If replacement is necessary, use only an original equipment
clamp with a matching number or letter.
4. Remove radiator hose clamp and hose from thermostat housing. A special clamp tool must be used to remove the constant tension clamps.
5. Remove the hose clamp and check valve hose at thermostat housing.
6. Remove the two upper generator bracket mounting bolts.
7. Remove the upper generator mounting bracket.
8. Loosen but do not remove the generator lower pivot bolt.
9. Position the generator to gain access to thermostat housing and housing bolts.
10. Remove thermostat housing mounting bolts.
