### Cooling System

#### FLUID RECOMMENDATION

The cooling fluid or antifreeze, should be changed every 30,000 miles or 24 months on all vehicles except the 1991–92 240SX with KA24DE engine on these vehicles change at 60,000 miles or 48 months then every 30,000 miles or 24 months. When replacing the fluid, use a mixture of 50% water and 50% ethylene glycol antifreeze.

Check the freezing protection rating at least once a year, preferably just before the winter sets in. This can be done with an antifreeze tester (most service stations will have one on hand and will probably check it for you, if not, they are available at an auto parts store). Maintain a protection rating of at least 20°F (29°C) to prevent engine damage as a result of freezing and to assure the proper engine operating temperature.

It is also a good idea to have the cooling system check for leaks. A pressure test gauge is available to perform such a task. Checking and repairing a coolant leak in the early stages while save time and money.

Fig. 1: Coolant protection can be checked with float type tester

Fig. 2: The cooling system should be pressure tested at least once a year