It's called a drain cock and it's straight down behind and under the radiator on the left side way down there. Even though it's way down there it's still easier than getting to it from the bottom. It's not a typical screw type device though. It has a notch (metal tip coming out of one side of it and no threads. Just turn 3/4 turn and pull straight out.
In the radiator in the front of the engine
The coolant temperature sensor, on a 2005 Chevrolet trailblazer 4.2 liter engine, is located just above the thermostat housing. The thermostat housing is located in the front of the engine.
The 1989 Chevrolet 350 cubic inch engine coolant sensor is located on the front of the engine. The coolant sensor will be near the thermostat housing.
It is located in the intake manifold near the thermostat housing.
It is located on the intake manifold near the thermostat housing.
Just above the top radiator hose the leads into the engine.
Like ALMOST ALL EFI engines, it's in the fuel tank.
The 1995 Chevrolet Astro and coolant temperature sensor can be found on the front of the engine. The coolant temperature sensor will be a few inches above the thermostat housing.
The Ford Escorts temperature sensor is mounted in the following locations. In the 1.8L engines it is located in the cylinder head, 1.9L engines it is threaded in the heater hose inlet pipe, and in 2.0L engines, it is located at the rear of the engine.
The 1997 Chevrolet Camaro 3.8 liter engine coolant temperature sending unit can be found on the front of the engine. The coolant temperature sending unit will be approximately 3 inches above the thermostat housing.
The 2005 Chevrolet water coolant thermostats, is located on the front of the engine, near the bottom. You can follow the water supply hose from the radiator to the thermostat.
Conduction. The heat from the engine block transfers to the coolant inside the galleries by means of conduction. The coolant then has to be moved, to stop it boiling. In early simple engines, this movement was by Convection. In modern engines it is pumped.