Engine Flushing - Vehicles With pH Equal to or Above 7.8
Perform the following procedure only if all the following conditions are met.^ pH LEVEL IS EQUAL TO OR ABOVE 7.8
^ VEHICLE IS BUILT AFTER 10/95
^ VEHICLE HAS ORIGINAL COOLANT
^ VEHICLE HAS LESS THAN 80,000 KILOMETERS (50,000 MILES)
If any of the above conditions are not met, proceed to "Engine Flushing -- Vehicle With pH Below 7.8.".
1. Install coolant by-pass hose as follows:
^ Raise and support vehicle.
^ Remove splash shield.
^ Lower vehicle.
^ Remove radiator draincock, then completely drain and discard cooling system fluid.
^ Remove clean air tube.
^ Remove coolant recovery hose from fining shown in Figure 5 and discard clamp.
^ With suitable driver, represented in Figure 6, install restrictor insert (-8N030-) as shown in Figure 7. Restrictor insert must be installed flush to the shoulder on coolant recovery fitting. It is acceptable it restrictor insert is loose in fitting.
^ Install new screw clamp (376240-S100) on coolant recovery hose. Reinstall coolant recovery hose and tighten clamp.
^ Loosen alternator brace retaining nuts and position brace away from heater return hose. Refer to Figure 8.
^ Remove heater return hose from the water pump and the heater core return tube. See Figure 8.
^ Remove fuel vapor hose clip from stud on dash panel. Install new clip and fuel vapor hose clip on stud. Install and tighten new (N621906-S36) nut. See Figure 9.
^ Install coolant by-pass hose at heater core return tube located at dash panel. See Figure 10.
^ Remove heater supply hose from lower intake manifold and discard clamp.See Figure 11.
NOTE:
The "H" marking on hose must be in straight-up position.
^ Install coolant by-pass hose to lower intake manifold heater supply fitting and install clamp inside "H" marking. Refer to Figures 10 and 11.
NOTE:
Check by-pass hose assembly for possible kinks or possible interference with transmission dipstick and ETA check valve.
^ Cut heater supply hose approximately 8-1/2 inches from original connection at lower intake manifold. Install new screw clamp (389772-S1 00) on remaining heater supply hose. Install heater supply hose to "Tee" on coolant by-pass hose and tighten clamp. Refer to Figure 11.
^ Reinstall clean air tube.
^ Insert new coolant by-pass hose into new clip on dash panel. See Figure 12.
2. If the vehicle's coolant is not discolored, proceed to Step 3. If the vehicle's coolant is discolored, perform the following cooling system flush procedure.
^ Install a 3/4" I.D. rubber cap on the water pump heater hose fitting. See Figure 13.
^ Disconnect and plug radiator overflow hose from coolant recovery bottle. Discard clamp. Refer to Figure 14.
^ Install coolant pressure relief cap.
^ Attach 4 foot section of 3/8-inch vinyl hose to overflow fitting on coolant recovery bottle. See Figure 14. Let vinyl hose hang over fender.
^ Push vehicle to flushing station.
^ Connect garden hose to heater return hose using adapter. See Figure 15.
^ Turn garden hose on full pressure.
^ With engine off, flush engine for five (5) minutes. Water will drain out of radiator draincock hole and 4 ft. hose attached to coolant recovery bottle.
^ Turn garden hose off and remove coolant pressure relief cap from coolant recovery bottle.
^ Disconnect garden hose from heater return hose. Let cooling system completely drain before proceeding to next step.
^ Push vehicle back to hoist.
^ Raise and support vehicle.
^ Install radiator draincock and tighten.
^ Install splash shield.
^ Lower vehicle.
^ Remove rubber cap from the water pump heater hose fitting.
^ Remove 3/8-inch vinyl hose from coolant recovery bottle.
^ Unplug radiator overflow hose, then install new screw clamp (376240-S100). Reconnect radiator overflow hose to coolant recovery bottle and tighten clamp.
3. Connect and clamp the heater return hose to water pump fitting.
4. Reattach and secure alternator brace.
5. Add one (1) bottle (16 oz.) of Heavy Duty Cooling System Additive (FW-16) to coolant recovery bottle.
6. Add 6 quarts of new coolant (-19549-) to coolant recovery bottle. Fill remainder of cooling system with water to cold fill line on coolant recovery bottle.
7. Start engine and top off with water to cold fill line, if necessary.
NOTE:
This step must be done before thermostat opens.
8. Rev engine to 3000 RPM for 30 seconds, and check for foaming inside coolant recovery bottle. If foaming is present, turn off engine and refer to Coolant By-Pass Restrictor installation, as the coolant by-pass restrictor has not been installed.
9. Install coolant pressure relief cap.
10. Select maximum heater temperature and blower motor speed settings.Position control to discharge air at panel vent in the instrument panel.
11. Start engine and allow to idle until normal operating temperature is reached. While engine is idling, feel for hot air at panel vents.
CAUTION:
If air discharge remains cool and engine coolant temperature gauge does not move, engine coolant level is low and must be filled. Stop engine, allow to cool and fill cooling system as described.
12. Start engine and allow to idle until normal operating temperature is reached. Hot air should discharge from panel vents. Engine coolant temperature gauge should maintain a stabilized reading to within the NORMAL range and the upper radiator hose should feel hot to the touch.
13. Shut engine off and allow to cool.
14. Check engine for coolant leaks.