A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
It will happen on acceleration & deceleration, or when cruising at a constant speed whenever it's in the 2100-2200 rpm range. It happens when under load (going up a hill) or no load when cruising on flat road, or when going downhill.
In the first post, you said the noise only happened under load. Has the pattern now changed, or is there a typo here?
Might be a slight language difference here, sorry for any confusion. It happens when under load (going up a hill), or no load (what I mean here as not pushing the engine hard, but cruising in gear with relatively no ask of power to keep constant speed.
In addition to @DrRobin's belts, pulley, and TO bearing, I would add to check your engine and (especially) gearbox mounts. The latter is failure-prone on these cars after a certain age. And if the noise only happens under load, that may be your clue. Easy job.
If it were me, at that mileage I would plan to replace the belt(s) anyway unless I know it has been done recently, and I would have a good, long look at the harmonic balancer aka crank pulley too. But that really depends on your attitude towards doing things as PMs vs spending money only when unavoidable.
