Things You'll Need:
Your 1990 Nissan 300ZX uses engine coolant to protect the components of the engine from heat damage. You should replace the coolant every two years to maintain the best results. If you run coolant for too long, you risk overheating the engine and possibly damaging the engine block. Replacing the coolant also lets you remove any debris introduced to the radiator over time. There is no need to call a service center to change the coolant. Drain and replace the coolant at home.
Position a large drain pan beneath the radiator drain plug on the bottom left side of the radiator. Raise the hood of the car and rest it on the support rod.
Remove the radiator cap and set it aside in a safe location. Twist the drain plug at the base of the radiator counterclockwise to loosen it. You can turn the plug by hand. Wait while the coolant drains completely from the radiator.
Once all the old coolant has drained, tighten the radiator drain plug by turning it clockwise. Fill the radiator with distilled water, pouring it directly into the radiator. Turn the drain plug counterclockwise and allow the water to drain from the radiator, flushing any debris or contaminants from the radiator.
Turn the drain plug clockwise until it is tight. Fill the radiator with a 50-50 blend of antifreeze and water. Fill the coolant reservoir tank to the "H" line.
Start the engine and let it idle for a few minutes. Press the accelerator to raise the engine RPMs two or three times for a few seconds at a time. Watch the temperature gauge for signs of overheating. Turn the engine off right away if it begins to overheat. Turn the engine off after racing the engine a few times and allow it to cool completely.
Top off the coolant if the levels dropped at all in Step 5. Replace the radiator cap and lower the hood.
There is no need to call a service center to change the coolant.
Submitted by xxx@******.com
Article submitted on 22 Oct 2010
Last modified on 22 Oct 2010
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