The purpose of the radiator in your Nissan Altima is to keep the engine from overheating. If the radiator is damaged or worn out, you must replace it to prevent expensive engine damage. If your Voyager needs a new radiator, you may be able to replace it yourself. Here's how to replace the radiator in the 1998 to 2001 model Altima with a 1.8-L, 2.0-L, 2.4-L or 2.5-L engine.
Loosen the plug on the bottom of the radiator and drain the engine coolant into a resealable container.
Disconnect the negative battery cable. Unhook the fresh air duct. Take off the upper radiator hose and lower radiator hose. If your Nissan Altima is equipped with an automatic transmission, disconnect the cooler hoses and plug them to prevent leaks.
Inspect the radiator hoses for signs of wear. If you see bulging or cracks, replace the hoses.
Remove the air conditioner condenser and radiator core, being very careful not to scratch them. Pull the radiator, along with the fan assembly, out of the vehicle. Unhook the fan assembly and attach it to the new radiator.
Install the new radiator, with fan assembly, into the vehicle. Reinstall the air conditioner condenser and radiator core and automatic transmission cooler hose, if applicable.
Replace the upper and lower radiator hoses, and reconnect the negative battery cable.
Fill the radiator with a mixture of antifreeze and distilled water. Attach the radiator cap very loosely and start the engine. Let it run for a few minutes, then check the fluid levels and add more, if necessary. Put the radiator cap on securely.
