Thermostat replacement?

You must have a bad gasket here is a guide to help you change out the thermostat with instructions 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.

Hi,

More than likely one of the mounting surfaces is not true any longer and so your gasket can no longer take up that difference. I would suggest just using Motorcraft Silicone TA-29. This is meant to resist oils and coolant. I use it all the time to seal thermostat all the time.

Let me know if you have questions. Thanks

Hi:
drain the radiator. Follow the upper rad hose to the engine. It will end at the t-stat housing. Remove the rad hose clamp, then the hose. Now remove the t-stat housing. Under the housing you will find the t-stat. Pay attention to the direction the old stat is sitting in and replace the new one the same way. Just reverse the sequence to replace it.

Joe

THERMOSTAT - 3.0L (4V)
Removal and Installation
1. Raise and support vehicle. For additional information.
2. Remove the front splash shield
3. Drain the cooling system.
4. Remove the cooling tube bolt.
5. Lower the vehicle.
6. Remove the radiator upper cooling tube bolt.
7. Disconnect the upper radiator hose and engine vent hose..
8. Remove the two bolts, and separate the radiator tube from the thermostat housing. Remove the thermostat.
9. To install, reverse the removal procedure.

L(2V) locate upper hose and thermostat housing remove 3 bolts holding housing remove and replace thermostat

Possible thermostat, but with engine at temp, quickly touch both heater core hoses, if one is hot and one cool/warm, then core is blocked. If both are cool/warm then thermostat.

3.0 DOHC engine.

Drain the coolant until the level of the coolant is below the level of the thermostat.
Raise the vehicle and support it with jackstands.
Disconnect the lower radiator hose from the water inlet connection.
Unfasten the two water inlet connection retaining bolts and remove the water inlet connection.
Remove the O-ring seal and thermostat from the water inlet connection. Inspect the O-ring for damage and replace as necessary.

To install:

Clean the water inlet connection mating surfaces.
Install the O-ring, thermostat and the water inlet connection. Refer to the accompanying illustration If you can-t remember how the O-ring and thermostat are positioned.
Install the water inlet connection assembly retainers and tighten them to 71-106 inch lbs. (8-12 Nm).
Connect the lower radiator hose to the water inlet connection.
Fill the engine with coolant, start the engine and check for leaks.
Stop the engine and top off the coolant recovery reservoir as necessary.

Hi there,

You can still remove this broken bolt with a good quality stud extractor, ask you local tool supply to show you what is available if in doubt get a mechanic to do this for you.

Mark (mhpautos)

No. See images.

Removal and Installation

Drain the engine cooling system.

Disconnect the lower radiator hose from the water outlet adapter.

Remove the bolts, the water outlet adapter and thermostat.
Remove and discard the O-ring seal.
To install, reverse the removal procedure.

https://www.2carpros.com/kpages/auto_repair_manuals_alldata.htm

Yes, it is the intake. I don't know how big of a piece broke, so you may want to have a welder take a look at it. If it isn't repairable, then your only choice is to replace the intake.