TP-6907 5/1658 Section 4 Cooling System
4.6 Draining Cooling System
The radiator contains a coolant drain valve to drain the
cooling system. When draining the coolant, remove the
radiator’s pressure cap, which will allow the entire
system to drain and will prevent air pockets from forming
and restricting coolant passage to the block.
1. Remove the pressure cap to allow the entire
system to drain and prevent air pockets from
restricting coolant flow through the engine block.
2. Open the coolant drain valve and allow the system
to drain.
3. If the inside of the radiator has mineral deposits or
the used coolant contains dirt or grease, go to
Section 4.7, Flushing and Cleaning. If the cooling
system does not have mineral deposits, refill the
cooling system as instructed in Section 4.8, Filling
Cooling System.
4.7 Flushing and Cleanin g
For optimum protection, drain, flush, and refill the
cooling system at the interval listed in the service
schedule.
Flushing and Cleaning Procedure
1. Flush the system with clean water.
2. Drain, clean, and flush the coolant overflow bottle.
3. Refill the cooling system as instru cted in
Section 4.8.
4.8 Filling the Cooling S ystem
Model Coolant Capacity, L (gal)
24RCL, 30RCL,
and 38RCLB
13.2 (3.5)
Figure 4-5 Coolant Capacity
Note: Do not add coolant to a hot engine. Adding
coolant to a hot engine can cause the cylinder
block or cylinder head to crack. Wait until engine
has cooled.
1. Close the radiator’s coolant drain valve and tighten
the hose clamps.
2. Fill the radiator with the recommended coolant
mixture of 50% ethylene glycol and 50% clean,
softened water to inhibit rust/corrosion and prevent
freezing. The coolant capacity is shown in
Figure 4-5.
3. Operate the engine with the radiator cap removed
until the thermostat opens and the upper radiator
hose becomes hot.
4. Stop the engine and allow it to cool.
5. Add coolant to the radiator to just below the
overflow tube on the filler neck. See Section 1,
Service Views, for the overflow tube location.
6. Replace the radiator’s pressure cap.
7. Maintain the coolant level in the coolant overflow
bottle between the High and Low markings. See
Section 1, Service Views, for the coolant overflow
bottle location.
4.9 Pressure Cap
The pressure cap raises the boiling point of the coolant,
enabling higher operating temperatures. If the cap
leaks, replace it with the same rating type of cap. The
pressure cap typically has the pressure rating stamped
on the cap body. Find the pressure cap rating in
Figure 4-6.
Item Rating
Pressure cap 97 kPa (14 psi)
Figure 4-6 Pressure Cap Rating
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