It's a realtively easy, though messy job.
Drain radiator into bucket. Petcock is just under the radiator, and free from cowling that covers most of front underside. It unscrews all the way(lefty loosey). Make sure coolant is not to hot when you do this. Screw petcock back in.
Move bucket under thermostat housing. Unscrew 12 mm nuts, pull housing(still attached to hose) away from engine, releasing more coolant. Thermostat may be stuck in engine or housing...I used water pump pliers to pluck it out. Again, more coolant flows. Peel off rubber gasket/o-ring from old thermostat, and work onto new thermostat.
Place new thermostat into housing in same orientation as old one removed. Push housing back in place (a little tricky, to keep thermostat seated). snug the 12 mm bolts back on.
Be careful refilling the radiator from overflow container. 50-50 water and antifreeze, until it seems full. Start engine with heater on full, keep topping coolant, after it warms up.
Put radiator reservoir cap back on. Test drive, check for leaks and coolant level again.
What size engine do you have?
The thermostat is on top of your intake manifold, on the front side. Locate the radiator hose that runs to your intake, take the hose off and the thermostat will be sitting on the manifold under the hose.
You can find the thermostat on a 1995 Lexus GS300 near the radiator. To locate it, remove the upper hose assembly where it hooks to the radiator.
To change a thermostat on a 1994 Toyota Camry V6, drain the radiator partially. Remove the upper hose assembly, unbolt the thermostat, and put the new one in place. Refill the radiator completely.
Just follow the upper rad hose back to the top of the engine. Where it bolts in is where the thermostat is located.
Remove the water supply hose from the top of the thermostat housing. Remove the thermostat housing retaining bolts. The old thermostat will simply lift out. Reverse the process to install the new thermostat.
Well it depends on the type of engine you have, but that only has to do with the thermostat's location. The Haynes GM manual #38025 has instructions on how to change the thermostat in section 3-3. Amazon has copies of it dirt cheap.
where is the thermostat
Under the bonnet! You can't miss it!
follow the top radiator hose to engine . remove three bolts from housing change thermostat and gasket ,put bolts back in follow the top radiator hose to engine . remove three bolts from housing change thermostat and gasket ,put bolts back in
Where is the thermostat
The 1994 Chevrolet Beretta thermostat is located on the front of the engine. You can follow the top radiator hose directly to the thermostat housing. The thermostat will be in the thermostat housing.