93 blazer water temp sending unit

simple question.

where is it?

my temp guage doesn't move.

this is my first/best guess.

i also have fairly loisy heat, so maybe it's just the thermostat. i've already seen on the forum where to find/replace that...

thanks in advance

if its a tbi the sensor is right beside the thermostat houseing and or on the right side head inbetween 3,5 or 4,6 exhause i cannot think what side