To acssess blower mortor take of carpeted panel under passenger side glove box. When it's off, loosen 3 screws holding motor unplug the ruber hose attached to mortor and disconect wire harness. It's best to go to dealer first after writing down part number of mortor since some after market mortors can't plug directly into factory harness and need some plicing to make work. Install is the exact reverse of take out.
The blower rheostat on a 93 Pontiac Grand Am is located inside the engine bay, just to the right of the blower fan housing. It is almost directly behind the trans dipstick. It isn't that hard to replace.
On the bottom of the dash on the passenger side remove the black cover then remove the bolts on the blower and disconnect the wire. Reverse above to install.
i broke down and paid to have this fixed. My mechanic said this is a fairly common problem on the older grand prixs. He had to replace the relay as well as the blower motor, total cost was $400.
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Check for a bad blower resistor at blower motor
the brushes r bad most likely a new on ti about 20 $ it should take "maybe" an hour to replace
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Blower shaft bushing worn.
Resistor is located behind the blower motor assembly.