Originally Posted by novapwr
The blower speed works on the 1st three settings but high goes dead. It is a manual control system. Does it sound like a blower module problem? I read it is located under the max fuse center and did read how to remove that.!
Now you've all done it. I had to go get my Buick service manual for 1998. It also shows Olds and Pontiac.
I am assuming the SAME circuits are used for 1995.
The relay for the manual blower system is a different relay from the others. It has terminal 87 which is the high amp terminal. It comes through fuse 3 on the relay center, a 30 amp fuse. It says right hand underhood.
The relay also contacts terminal 87A which is the lower power circuit that gets 25 amp from fuse 5D in the instrument panel fuse block. That supplies the 3 lower speeds and when switched to high applies voltage to the relay switching it from the 25 amp circuit to the 30 amp circuit.
The SAME wiring supplies the blower from the relay on to the blower. The blower uses only one ground which is terminal B on the blower motor. Your motor should have run the same but when you disconnected the terminal socket for both A and B from the blower motor, there was no ground. You do have to supply your own ground!
Easy check is fuse 3 in the relay center. Hope it'* blown. Might question why it blew, but that'* an easy replacement. I might indicate impending blower motor failure with age and high current loads.
it could indicate the relay is stuck on the 87A contact and not switching under power to the other terminal. Could be primary circuit blown not pulling the relay or could be the contacts are physically burned to the most-used contact.