The radiator in your Chevy Blazer truck is important to keep the engine cool and running. If the coolant is not properly flowing and the radiator is the cause, you need to replace it. The exact process of replacing the radiator in your Blazer can vary depending on the exact year of the truck. Other factors exist as well, including whether the truck has automatic transmission or not.
Disconnect the truck's negative battery cable and drain the engine coolant, loosening the drain fitting on the radiator--with pliers if needed--and pouring the coolant into a large container.
Remove the air intake duct from the air intake system, loosening the duct clamps with a screwdriver, then unscrew and remove the upper fan shroud using your screwdriver.
Disconnect the transmission cooler lines from the radiator using a wrench, and plug the lines with rubber--these lines are only on a truck with automatic transmission. Disconnect both radiator hoses, taking note of which is the upper and lower.
Press the three plastic tabs for the lower radiator shroud with a screwdriver and lift the radiator out of the engine.
Insert the new radiator in the engine compartment and see that the lower shroud tabs engage. Connect the upper and lower radiator hoses and the transmission cooler lines (if needed).
Reconnect the upper fan shroud with its screws and install the air intake duct with its clamps.
Refill the radiator at its filler neck. If the old coolant is dirty at all, use a fresh combination of half water and half antifreeze.
Reconnect the battery cable.
