My 850 coupe has the dreaded heater fan "squeal", especially when it's very cold out (when you really need it). It gets better as the heater box warms up and doesn't squeal at all in temps above 45. Is there any way to squirt some lubricant into the blower or some other way to help silence it? Or am I looking at disassembling the entire heater box under the dash and replace the motor? I remember my 124 Spiders had the same issue years ago. The funny thing is, the fan continues to work, it just goes slower. I noticed revving the engine (more power) seems to actually help it go away. Almost like a low voltage level is making it worse.