Sounds like a jet engine

Good morning,

Can you upload a video of the noise?

I have heard this before and found a clogged cat converter forced exhaust back through the EGR valve. I would remove the line from the EGR valve and see if the noise goes away.

This has nothing to with the cooling system.

Roy

Exploded View

Removal and Installation
1. Disconnect the exhaust gas recirculation (EGR) system module electrical and vacuum connectors.
2. Disconnect the EGR system module-to-exhaust manifold tube upper fitting.
To install, tighten to 40 Nm (30 lb-ft).

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3. NOTE: When installing the new EGR module gasket, install with the side with the raised circle facing the intake manifold.

Remove the bolts, the EGR system module and the gasket. Discard the gasket.
To install, tighten to 25 Nm (18 lb-ft).

4. NOTE: The EGR system module sealing surfaces are soft metals.

Carefully clean the EGR system module sealing surfaces.

5. To install, reverse the removal procedure.
Install a new EGR system module gasket.

Removal

WARNING: The normal operating temperature of the exhaust system is very high. Never work around or attempt to repair any part of the exhaust system until it has cooled. Use special care when working around the catalytic converter. The catalytic converter heats to a high temperature after only a short period of engine operation. Failure to follow these instructions may result in personal injury.

CAUTION: Do not use oil or grease-based lubricants on the isolators. These lubricants may cause deterioration of the rubber. This can lead to separation of the isolator from the exhaust hanger bracket during vehicle operation. Use only water-based lubricants on the isolators.

NOTE: Exhaust fasteners are of a prevailing torque design. Use only new fasteners with the same part number as the original. Torque values must be used as specified during reassembly to make sure of correct retention of exhaust components.

1. With the vehicle in neutral, position it on a hoist. For additional information, refer to Maintenance/Service and Repair
2. Using a suitable jack, support the exhaust system.
3. Disconnect the heated oxygen sensor (HO2S) and the catalyst monitor sensors electrical connectors.
4. Remove the exhaust Y-pipe dual catalytic converter-to-muffler assembly bolts, nuts and gasket.
Discard the exhaust Y-pipe dual catalytic converter-to-muffler assembly bolts, nuts and gasket.

5. Remove the transmission support crossmember.

6. NOTE: RH side shown, LH similar.

Remove the exhaust Y-pipe dual catalytic converter-to-exhaust manifold nuts.
Discard the exhaust Y-pipe dual catalytic converter-to-exhaust manifold nuts.

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7. Remove the exhaust Y-pipe dual catalytic converter.