You can't. I have seen probably 50+ of them, and every one is dry rotted on the front left. You will have to purchase an aftermarket overflow. Here are some links: http://www.horsepowerfreaks.com/performanceparts/Nissan/240SX/Cooling/Coolant_Overflow_Tanks http://www.prostreetonline.com/buy/weapon_r_coolant_overflow_tank/nissan/ Voodoo Street
Transmission fluid, if you have a bad radiator.
On the bottom of the plastic coolant overflow (fill) container on the passenger side.
The engine coolant reservoir or the overflow bottle.
Engine coolant.
The overflow resavour is where you add coolant
Answering "Where is engine coolant drain plug for a 1.8 Nissan sentra engine?"
Yes. There should always be some coolant in the overflow tank. Its level should rise when the engine warms up, and it should go back down when the engine cools.
coolant overflow tank. probably on top left side of engine towards the front.
Look on the side of the coolant overflow bottle. There should be a low mark for the coolant for a cool engine, and one for a hot engine.
If you have the closed system, then the cap is on the overflow container. You have to add from there. If the system was emptied, you can add enough directly thru the top hose, and the rest by the overflow. If you have no overflow, then add by the rad. cap. Just un-screw it when the engine is cold.
It collects the expanding coolant that is heated by the engine and recycles it back into the coolant system once it loses enough heat. The radiator overflow tank works in conjunction with the radiator cap to protect the engine and prevent coolant loss due to overflow. Source: Quora.com
"Inside the overflow tank. you get to buy a whole new tank." The switch inside the overflow tank is the coolant level switch. The engine coolant temperature sensor is located on the driver side of the engine near the rear of the engine compartment. by theramonast