Gear box drone or hum

JKR said:

Have 2.5 DSE Rangie (2001) Auto which has developed a distinct hum or drone when I lift off the accelerator power, has anyone had any similar experience to enlighten me about what might be going wrong?
Any ideas or suggestions welcome.

Have this now for nearly 6 years, delightful, no major problems, 3 suspension bellows replaced, radiator, injectors, 117k miles on now.

Click to expand...

JKR said:

The noise seems to be more centrally located beside me than behind me ??

Click to expand...

JKR said:

sounds possible, more to consider/ check out by my guy, great pointers.
At least no one (so far) has suggested a new gearbox thankfully.

One other thing that is concerning me of late is the variation in the temp gauge for no immediately apparent reason.
Radiator recently replaced, but this pre-dates that, temp can vary from just below the white line on gauge (normal in attached pic) to being more or less vertical (hot in pic), coolant level is constant, so no leaks happening. one other thing is that heat level goes cold when gauge rises, and turning up the heat controls brings gauge back to lower level.

Click to expand...

JKR said:

sounds possible, more to consider/ check out by my guy, great pointers.
At least no one (so far) has suggested a new gearbox thankfully.

One other thing that is concerning me of late is the variation in the temp gauge for no immediately apparent reason.
Radiator recently replaced, but this pre-dates that, temp can vary from just below the white line on gauge (normal in attached pic) to being more or less vertical (hot in pic), coolant level is constant, so no leaks happening. one other thing is that heat level goes cold when gauge rises, and turning up the heat controls brings gauge back to lower level.

Click to expand...

Datatek said:

Airlock or thermostat stuck open, the gauge should be at 12 o'clock when the engine has warmed up.

Click to expand...