Blower Motor Troubles

[88 Beast]

After many months of sitting because of engine electrical issue frustration, finally got the old girl up and running again this week (replaced ecm). Now having problem with blower motor fuse blowing in ac or defrost position. On vent and heat, works fine. Coincidence? I know the ac is tied into defrost to dehumidify the air in defrost mode. Any ideas? Was going to remove ac relay to try and eliminate that circuit but don't know which relay of the four on passenger side fender. Also now after sitting a few minutes with engine off, heater mode control looses vacuum and goes into defrost even though the mode switch is in vent or heat until engine is started and vacuum builds then returns to set mode. Any help would be great. 

[ftpiercecracker1]

I don't know what else is on the blower circuit but i think a good place to start would be to disconnect your blower motor and try changing to a/c or defrost again and see what happens. If it still blows you've got problems else where, if not. . . . . . . we'll cross that bridge when we get to it.

 

FPC.

[cruiser54]

Just try unplugging the compressor first. 

 

AC relay is the furthest one back, closest to the firewall. 

[88 Beast]

Thanks for the input guys. Tried suggestions and still blew fuse. Removed ac relay and no blown fuse. replaced with a spare relay, Good to go! Thanks again. Now onto other joys, noisy wheel bearing, worn u joints, etc., etc.