It could be the timing belt idler pulley.
Take off all the V belts to test this theory.
volvolugnut

If you take off the belts and they look bad, this would be a great time to replace the belts.
As I recall, removing the fan blade is a big help in changing the belts.
volvolugnut

Also look around for any loose electrical connectors. These can get missed in any major parts removal/replacement process.
volvolugnut

Besides this coli harness guide, Dave Barton has extensive information on Volvos from 1970s to present models. His website is massive and includes interesting history of his own Volvos.

volvolugnut

Over the years, I purchased from Dave Barton an engine wiring harness, window scraper rubbers, and Prancing Moose stickers.
He used to (maybe still) would frequent the southern cal salvage yards and gather many Volvo parts.
volvolugnut

foggydogg wrote: ↑25 Nov 2024, 08:05 There are several degrees of separation here...

Mercedes 600 (in far left corner).
volvolugnut

$450 (or more) is why my passenger side window has voice control.
Passenger "Will you put down my window?"
Driver "Yes. Let me push my button for your window."
volvolugnutr

Just had a DA moment. Sigh.
volvolugnut

Pelican Parts has 10% Off. This special sale ends today.
I have purchased some parts from them in the past with good pricing and service so far.
volvolugnut

I am seeing a trend in this thread of different approaches to fuel injector and general parts replacement. The typical approach for most vehicle owners is to wait until obvious problems appear and then make repairs. The 'industrial maintenance' approach is to monitor the state of the vehicle and mak...