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REPLACING RADIATOR

Liquid-cooled engines, such as the one installed in your car, require a radiator to cool the water that, in turn, removes heat from the engine. It is essential that the engine cooling system function properly regardless of weather or temperature. Given enough time, any failure in the cooling system can and will allow the engine to overheat, and critical components in the engine will warp or melt.  This article will cover the basics so you can replace the radiator yourself; if you decide to take the car in to your local repair shop instead, I strongly recommend picking up a copy of A Mechanic Comes Clean before you go - this handy guide will teach you how to avoid common auto repair scams.

The engine cooling system on a car is composed of a radiator, hoses, coolant, and fans. The radiator is also responsible for cooling automatic transmission fluid on vehicles equipped with automatic transmissions. So as you see, if you're experiencing radiator problems, they need to be fixed quickly.

Replacing a radiator can be a tedious task, but it is not too difficult for the mechanically inclined "backyard" mechanic. If it's your first time to change a radiator, expect to spend a full 6 hours on the job. Before you begin, make sure that the car has been parked for several hours. Radiator fluid can build up substantial pressure in the radiator when hot. Do not, under any circumstances, attempt to open a radiator cap that feels warm. Here's how to replace a radiator:

  • Do not allow antifreeze to sit around. It tastes sweet, and children or dogs may consume it. Antifreeze is very toxic! Use caution! Properly dispose of used antifreeze at a recycling center.
  • Disconnect the battery. You want to prevent any electric cooling fans from turning on while you are working in that area. Ensure that the ignition is off.
  • Drain the radiator fluid into a suitable container. The radiator plug is near one of the bottom corners. Simply unscrew it, and the fluid will flow.
  • Remove the old radiator:
  • Take off any plastic covers around the radiator.
  • Most modern cars are equipped with electric cooling fans. Disconnect the electrical connector to the fan, and unbolt and remove the fan assembly. Take careful note as to how this fan assembly and shroud are put together.