Note I'm a brake and suspension tech so my knowledge of underhood repair is limited at best,
My G/F's 2000 Suzuki Grand Vitara 2.5L V6 2WD 5 spd stick is starting to run rather hot and once the temp gauge gets much past the 1/2 mark, the AC quits blowing cold. Yes; both the electric pusher and mechanical fans remain on; however, unbeknownst to me, the pusher was disconnected so I plugged it back in. Truck has about 115K miles on it.
I 'hit' the upper and lower radiator hoses with a temp gun and the upper is ca. 190F (200F at the radiator proper by the upper hose) with the lower coolant pipe about 150F or thereabouts. I suspect thermostat which is where the lower coolant pipe goes back into the motor but want to make reasonably sure before I start throwing parts at this thing.
What does concern me is a possible blown head gasket.