Where are the freeze plugs in a 90 Chevy Blazer 4x4?

The freeze plugs (also called core plugs) in a 1990 Chevy Blazer 4x4 are located on the engine block itself, not in the radiator or elsewhere in the cooling system. Their exact location varies slightly depending on the engine (a 4.3L V6 or a 6.2L V8 were common in that year). However, they're generally found in these areas:

* On the engine block: Most will be on the sides of the engine block, often near the lower portion, close to the cylinder bores. Some might also be located on the back of the block.

To accurately locate them, you'll need:

* A repair manual specific to your Blazer's engine: This is the most reliable source. It will have diagrams showing the exact location and size of each freeze plug. You can often find these online or at auto parts stores.

* Visual inspection: With the engine relatively clean, you should be able to see them. Look carefully near the bottom of the engine block. They're usually round and slightly recessed.

Important Note: Don't attempt to remove freeze plugs unless you're replacing them or addressing a leak. Improper removal can damage the engine block. If you're unsure, consult a mechanic.