#### DRAIN AND REFILL

NOTE: Refer to the correct procedure for your year and model. Read the complete service procedure before starting this repair. Bleed the cooling system as outlined if necessary.

To drain the cooling system, allow the engine to cool down BEFORE ATTEMPTING TO REMOVE THE RADIATOR CAP. Then turn the cap until it hisses. Wait until all pressure is off the cap before removing it completely.

CAUTION
To avoid burns and scalding, always handle a warm radiator cap with a heavy rag.

1. At the dash, set the heater TEMP control lever to the fully HOT position.

   Fig. 1: Changing engine coolant — 240SX model

   Fig. 2: Changing engine coolant — Stanza model

2. With the radiator cap removed, drain the radiator by loosening the petcock at the bottom of the radiator.

   NOTE: On the 1982–86 Stanza models, remove the heater inlet hose from the connector pipe at the left rear of the cylinder block to drain completely. After draining, reconnect the hose to the pipe.

3. Close the petcock (be careful not to damage the petcock when closing), then refill the system with a 50/50 mix of ethylene glycol antifreeze; fill the system to 3⁄4 –1 1⁄4 in. (19–32mm) from the bottom of the filler neck. Reinstall the radiator cap.

   NOTE: If equipped with a fluid reservoir tank, fill it up to the MAX level.

4. If you have replaced or repaired any cooling system component the cooling system must be bled as outlined:

   NOTE: On 1982–86 Stanza models insert a 3mm pin into the 3-way valve, located at the firewall, and push it in as far as it will go. While pushing in on the pin, fill the radiator up to the filler opening. Replace the radiator cap and fill the reservoir.

   NOTE: On all year 200SX and 1987–89 Stanza models slowly pour coolant through the filler neck to release air in the system.

   NOTE: On all year 240SX and 1990–92 Stanza models slowly pour coolant through the filler neck to release air in the system with the air relief bolt or plug loosened.

5. Operate the engine to normal operating temperature. Check the system for signs of leaks and for the correct level.

   Fig. 3: Removing the inlet hose from the connector pipe 1982–86 Stanza

   Fig. 4: Using the 3-way valve to bleed the cooling system 1982–86 Stanza

   Fig. 5: Air release plug 1990–92 Stanza

   Fig. 6: Air release plug 240SX model

   Fig. 7: After filling the radiator, also fill the coolant reservoir