Wow... I had a fun time tonight. I tried the manual cleaning of the heater box as described in here http://www.bonnevilleclub.com/forum/...e=article&k=63
. I took out the relay rail, and blower resistor as described. I don't have brake cleaner so I sprayed with castrol degreaser (purple bottle). I then took a hose as described and sprayed maybe 10 - 15 seconds worth. Maybe I should spray longer? I didn't want to risk getting water in the interior... The water was driping out of the heater box as expected. I waited like a few minutes and then turned on the car. Not much change if at all.
Bah. I think all I did was lose the nut that holds the relay rail to the firewall.
It seems as though the manual bonneville does not have a hvac programmer at all? Good to know!
How do I get to the back side of the selector switch assembly? I really don't want to remove the dash nor know how to... My bonneville is in amazing condition except for this problem. I don't want to trash it up that much :(