I have a 91 240. Recently the heater/AC fan has started squealing intermittently which will often stop if I switch the fan up to a higher speed and then back down. Well, that was working but this weekend on a long road trip it was squealing more often than not to the point where I pulled the #3 fuse which controls the fan. Weirdly the squealing continued for several minutes until I turned the control switch up to 3 at which point it stopped. I know Volvo's have a "continuous flow" ventilation system and so was wondering if it actually has 2 fans to move the air around or just the one and if 2 is there anyway to disconnect the continuous one which seems to be the problem. Years ago I changed the fan motor on my 1980 240 and I'll not be doing that again. Has to be one of the most difficult things I ever attempted.
Thanks