Thermostat replacement?

Soak it with penetrating oil tap the bolts lightly with a hammer and then check out this video which shows how to remove broken bolts

https://youtu.be/py-rIWATchY

This guide will help you change out the thermostat with diagrams below to show you how on your car.

https://www.2carpros.com/articles/replace-thermostat

Check out the diagrams (Below). Please let us know what happens.

Here is the location for the thermostat for your car . Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

It depends on your vehicle's engine type.

3.0 Vulcan, 12 valve engine:

Looking in from the front of the car, it is on the right side of the engine, where the radiator hose goes in - remove the housing's three bolts - the thermostat will be inside

Follow the large top radiator hose to the engine block. It connects to a little dome-shaped fitting held on by three bolts. The thermostat is under it. Be sure to replace the gasket (after completely removing the old gasket) when you replace the thermostat.

3.0 Duratec, 24 valve DOHC engine:

If you have the 24 valve DOHC engine, the thermostat is on the other side (passenger) at the bottom front of the engine, accessible from underneath.

Most likely not. When you turn on the A/C, does the cooling fan(s) turn on for the radiator?

And it only overheats with the A/C turned on?

Ok, honestly I wouldn't waste time checking the thermostat. If thermostat was sticking then the A/C would not have much to do with the overheating.

When was the last time you have had the radiator flushed?

Easy way to check for bad head gasket or head is to let vehicle cool off. Open hood and remove radiator cap while cool. Get in and start vehicle (ensure noone is around front of vehicle). If coolant shoots up out of radiator cap opening then you have backpressure caused by faulty head gasket or head. If no coolant shoots out then gasket is most likely OK. Sounds more like dirty, corroded up radiator.

Hi follow the upper hose to the engine the t stat is right there

THERMOSTAT Removal 1. Drain the engine cooling system so that the engine coolant level is below the water thermostat. 2. Raise and support vehicle on hoist. See JACKING & HOISTING . 3. Disconnect the lower radiator hose from the water inlet connection. See Fig. 9. 4. Remove the two water inlet connection retaining bolts. Remove the water inlet connection. 5. Remove the "O" ring seal and water thermostat from the water thermostat housing. Inspect "O" ring for damage and replace if necessary. 6. If required, remove water thermostat housing retaining bolts, water thermostat housing and "O" ring from lower radiator hose tube. Inspect "O" ring for damage and replace if necessary. Installation 1. Install the water thermostat, "O" ring, water thermostat housing (if removed) as shown. 2. Install and alternately tighten the retaining bolts. Tighten bolts to specification. See TORQUE SPECIFICATIONS. 3. Connect the lower radiator hose to the water inlet connection. 4. Lower vehicle. 5. Fill the cooling system using Premium Engine Coolant (green in color), E2FZ-19549-AA or equivalent meeting Ford specification in a 50/50 mixture. Bleed system See BLEEDING . 6. Start the engine and check all hoses and connections for leaks. Allow the engine to warm up so that the water thermostat opens. 7. Stop the engine. Top off degas bottle as required to maintain minimum cold fill level. Fig. 9: Locating Water Thermostat Courtesy of FORD MOTOR CO. WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM OR ENGINE AND/OR PERSONAL INJURY. TO AVOID HAVING SCALDING HOT COOLANT OR STEAM BLOW OUT OF THE COOLING SYSTEM OR DEGAS BOTTLE, USE EXTREME CARE WHEN REMOVING THE PRESSURE RELIEF CAP FROM A HOT COOLING SYSTEM OR DEGAS BOTTLE. WAIT UNTIL THE ENGINE HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY UNTIL PRESSURE BEGINS TO RELEASE. STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN CERTAIN ALL PRESSURE HAS BEEN RELEASED, PRESS DOWN ON THE PRESSURE CAP (STILL WITH A CLOTH), TURN AND REMOVE PRESSURE RELIEF CAP.
6/11/2009

Yours is found by following the LOWER hose. on 3.0 2V VIN U or 2
Upper hose on 3.0 4V VIN S
And lower on the SHO VIN N
THERMOSTAT Removal 1. Drain the engine cooling system so that the engine coolant level is below the water thermostat. 2. Remove battery. Remove power distribution box. Remove battery tray. 3. Disconnect upper radiator hose and position out of the way. 4. Disconnect the lower radiator hose from the water inlet connection. See Fig. 2 . 5. Remove the two retaining bolts. Remove the water inlet connection. 6. Remove the "O" ring seal and water thermostat from the water pump . Inspect "O" ring for damage and replace if necessary. Installation 1. Install the water thermostat, "O" rings and water inlet connection. See Fig. 2 . 2. Install and alternately tighten the retaining bolts. Tighten bolts to specification. See TORQUE SPECIFICATIONS . 3. Connect the lower radiator hose to the water inlet connection. 4. Install upper radiator hose. Position spring clamp securely. 5. Install battery tray. Install power distribution box. Install battery. 6. Fill the cooling system using Premium Engine Coolant (green in color), E2FZ-19549-AA or equivalent meeting Ford specification in a 50/50 mixture. Bleed system. See BLEEDING . 7. Start the engine and check all hoses and connections for leaks. Allow the engine to warm up so that the water thermostat opens. Fig. 2: Locating Water Thermostat Courtesy of FORD MOTOR CO. WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM OR ENGINE AND/OR PERSONAL INJURY. TO AVOID HAVING SCALDING HOT COOLANT OR STEAM BLOW OUT OF THE COOLING SYSTEM OR DEGAS BOTTLE, USE EXTREME CARE WHEN REMOVING THE PRESSURE RELIEF CAP FROM A HOT COOLING SYSTEM OR DEGAS BOTTLE. WAIT UNTIL THE ENGINE HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY UNTIL PRESSURE BEGINS TO RELEASE. STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN CERTAIN ALL PRESSURE HAS BEEN RELEASED, PRESS DOWN ON THE PRESSURE CAP (STILL WITH A CLOTH), TURN AND REMOVE PRESSURE RELIEF CAP.