2006 Monte Carlo with 3500 v6 /flex fuel engine

Follow the upper radiator hose to the engine. It is underneath that housing where the hose connects to.
I hope this helps!

What is a vehicle RPO code?
A Regular Production Option (RPO) is a General Motors standard coding for vehicle configuration options. These codes are a combination of 3 alphanumeric characters and refer to a specific option or modification to the vehicle. Engine Coolant Thermostat Replacement (RPOs LZE/LZ4/LZ9)
Sticker on door jam .

3.5 L lower radiator hose

It should be located just below the thermostat housing. Look on the engine where the top radiator hose mounts connects. From the front of the car, look towards the driver's side about two inches below the thermostat. You should see a wiring harness going from the sensor to the exhaust manifold.

Should be located at the end of the upper radiator hose where it attaches to the engine.

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The thermostat is in the housing on the front of the engine where the radiator hose attaches. see diagram attached

The ECT (Engine Coolant Temp sensor) should be located by the coolant thermostat housing or where the upper radiator hose connects to the engine. It screws in with a plug or small/short wire harness attached to it. -------------------------------- To replace ect sensor:---

1. Drain and recycle the engine coolant.
2. Remove the intake manifold cover, if necessary.
3. Remove the exhaust crossover.
4. Disconnect the Engine Coolant Temperature (ECT) sensor electrical connector.
5. Remove the ECT sensor.

see fig below:---

.Thanks.

Follow upper radiator hose to housing on engine Remove housing make note how thermostat is installed Clean both surfaces Install new thermostat.Locate the upper radiator hose and trace it back to the engine. It connects to the T-Stat housing with a band clamp.Thanks

THE V6 ENGINE YOU HAVE TO REMOVE THE AIR FILTER HOUSING DUCT LEADING TO THE THROTTLE BODY.FOLLOW THE LOWER RADIATOR HOSE TO LOCATE THE THERMOSTAT.FOR THE V8 ENGINE THE THERMOSTAT HOUSING IS LOCATED ABOVE THE AIR CONDITIONER COMPRESSOR AND NEAR THE RIGHT END PASSENGER SIDE OF EXHAUST MANIFOLD.

What size engine? It should be where the upper radiator hose is attached to the engine.

the thermostant is behind the exhaust crossover pipe, this is the pipe that connects the front exhaust manifold to the rear, the housing is behind that, its a tight fit,also if you follow the upper radiator hose from the radiator to engine the housing that the hose goes to is where the thermostant goes,heres a diagram, hope this helps,