Upper and lower thermostat on a 6.6 diesel

have you ever asked a mechanic locally or a dealer or even an auto parts store ?. apparently not in a housing on the motor at the end of the upper radiator hose .

1 Drain enough coolant from the engine to bring the level below that of the thermostat. Store the coolant in a container that can be securely sealed.

2 Take the upper radiator hose from the water outlet adapter. Remove the upper mounting bracket for the power steering reservoir. Loosen and then remove the bolts on the water outlet adapter, and then remove the adapter.

3 Lift out the thermostat and the O-ring seal. Remove the O-ring seal and throw it away.

4 Set a new O-ring in place on the thermostat. Place the thermostat in position and then replace the water outlet adapter. Torque the water outlet adapter bolts to 18 foot pounds.

5 Replace the upper mounting bracket for the power steering reservoir. Torque the two upper bolts to 13 foot pounds and the lower bolt to 8 foot pounds.

6 Connect the upper radiator hose to the water outlet adapter. Refill the cooling system with the recommended coolant.

7 Start the engine and check for leaks. Turn off the engine and add coolant as needed.

Could be some overheating problem there; on 4.5L and 4.9L engines, check this procedure:
* Drain the coolant to a level below the thermostat housing.
* It may be necessary to remove the upper air filter assembly on some models.
* Remove the 2 bolts securing the upper thermostat housing to the lower housing.
* Remove the upper thermostat housing.
* Remove the thermostat and O-ring from the lower housing.


Hope htlps.

The sensor is located behind the crank pulley/harmonic dampener. To replace:

1 Remove the tire/wheel and splash shield.
2 Remove the bolts, then loosen the mount bolt and pivot the side engine mount out of the way.
3 Loosen the idler pulley center nut and adjusting bolt, then remove the A/C compressor belt.
4 Loosen the alternator mounting bolt, nut and adjusting bolt, then remove the alternator belt.
5 Loosen the mounting nuts and adjusting nut, then remove the P/S pump belt.
6 Remove the dipstick and pipe.
7 Remove the crankshaft pulley.
8 Remove the upper covers and lower cover. NOTE: Do not use the upper and lower covers for storing removed items.
9 Remove the CKP sensor from the cylinder block.
10 Install the CKP sensor in reverse order of removal.

Hello! First diagram is the lower...Second is the upper..Guru...saailer

LOWER IDENTIFICATION:




Item
Part Number Description 1
5495 Stabilizer Bar Link Bolt and Bushing Assembly 2
18A192 Nut, Washer and Bushing Assembly 3
808264 Bolt 4
5005 Frame 5
5B326 Torsion Bar (LH) 6
5B327 Torsion Bar (RH) 7
620481 Nut 8
5C491 Nut and Washer 9
3079 Front Suspension Lower Arm (LH) 10
3078 Front Suspension Lower Arm (RH) 11
3A130 Tie Rod End 12
808166 Nut 13
808167 Nut 14
5K483 Front Stabilizer Bar Link 15
5482 Front Stabilizer Bar 16
5484 Front Stabilizer Bar Bushing 17
3B353 Front Stabilizer Retainer 18
N807396-S100 Bolt A
- Tighten to 40-55 Nm
(30-40 Lb-Ft) B
- Tighten to 150-200 Nm (111-148 Lb-Ft) C
- Tighten to 21-29 Nm
(15-21 Lb-Ft)


UPPER IDENTIFICATION:
Item Part Number Description 1 3C156 Damper Assembly (RH) 2 805348 Nut and Washer 3 - Shock Absorber Insulator
(Part of 18198) 4 3C157 Damper Assembly (LH) 5 3020 Front Suspension Bumper 6 3083 Front Suspension Upper Arm Assembly A - Tighten to 34-47 Nm
(25-35 Lb-Ft)



LOWER DIAGRAM FOLLOWED BY UPPER:

It's upper, behind the alternator, so you're both right in a way. Upper is for the cooled coolant to go back into the engine, which has to go through the thermostat first. 2 ways to remove it are, 1. remove the alternator and then you'll have access to the thermostat. The other is to remove the front dirvers side tire to gain access. Might still need to remove the alternator for clearance.

Upper Radiator Hose and Thermostat

A large part of a radiator's function is made possible by the upper and lower radiator hoses. The upper radiator hose controls the flow of engine coolant from the radiator into the car engine. In a cold engine, engine coolant is stored inside the radiator. The engine coolant is held inside the radiator until the engine becomes hot enough to warrant engine coolant circulation. When an engine reaches operating temperature, the thermostat valve, which is located at the far end of the upper radiator hose, opens up and allows engine coolant to flow from the radiator into the engine.

Yes and no, at most auto parts stores they usually use the term "water outlet" to refer to the upper portion, the lid if you will, of the thermostat housing. This is the part that the upper radiator hose connects to. It looks like this:

Most times shops and parts stores use these terms interchangeably though. The thermostat in your car sits in whats called a water box, which the coolant temperature sensor connects into and is capped in by the housing/water outlet. I would just ask, if you are being told by a shop, if you just need the piece that connects to the radiator hose and bolts over the thermostat or if you need the the outlet and the water box.

You might try alldata.com, but you'll have to pay for it and it's based on the Chilton's manual. So, that may not help you.

Have you thought of using silicon gasket maker on the metal to metal part?

Follow the upper hose to the engine. The hose should be connected to the neck of the thermostat housing. Remove the housing and replace the thermostat. I suggest you buy the Chilton manual or equivalent for that car. That will help you a lot. Most parts stores have them or you can buy them online.