HelloCustomer I'm not sure what to say except that I have never had much difficulty finding the drain cock. One tidbit I can give you is it is usually on the engine side of the radiator and will turn easily. Here is what GM service information has to say about it.
The radiator is a heat exchanger. It consists of a core and 2 tanks. The aluminum core is a tube and fin crossflow design that extends from the inlet tank to the outlet tank. Fins are placed around the outside of the tubes to improve heat transfer to the atmosphere.
The inlet and outlet tanks are a molded, high temperature, nylon reinforced plastic material. A high temperature rubber gasket seals the tank flange edge to the aluminum core. The tanks are clamped to the core with clinch tabs. The tabs are part of the aluminum header at each end of the core.
The radiator also has a drain cock located in the bottom of the left hand tank. The drain cock unit includes the drain cock and drain cock seal.
The radiator removes heat from the coolant passing through it. The fins on the core transfer heat from the coolant passing through the tubes. As air passes between the fins, it absorbs heat and cools the coolant.
Cooling System Draining and Filling
Coolant and Battery Tester
Caution: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot.
- Remove the coolant pressure cap.
- Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
- Place a drain pan under the drain cock.
- Open the radiator drain cock.
- Drain the cooling system.
- If a complete engine block drain is required, remove the engine block drain plugs.
- Inspect the coolant.
- Follow the appropriate procedure based on the condition of the coolant.
|• ||Normal in appearance -- Follow the filling procedure.|
|• ||Discolored -- Follow the flush procedure. Refer to Flushing .|
- Close the radiator drain cock.
Tighten the radiator drain cock to 2 N·m (18 lb in).
- If the engine block drain plugs were removed, perform the following procedures:
|2.1. ||Apply pipe sealer to the drain plugs.|
|2.2. ||Install the drain plugs.|
Tighten the drain plugs to 18 N·m (13 lb ft).
- Lower the vehicle.
- Open the cooling system bleeder screws.
Important: Use a 50/50 mixture of DEX-COOL antifreeze and clean, drinkable water.
- Slowly fill the cooling system with a 50/50 coolant mixture. Close the cooling system bleeder screws.
- Install the coolant pressure cap.
- Start the engine.
- Run the engine at 2,000-2,500 RPM until the engine reaches normal operating temperature.
- Allow the engine to idle for 3 minutes.
- Shut the engine OFF.
- Allow the engine to cool.
- Top off the coolant as necessary.
- Inspect the concentration of the engine.
- Rinse away any excess coolant from the engine and the engine compartment.