Heat seems fine but blower motor won't come on sometimes. When it does work it works on all settings (high to low). Sometimes when you hit a bump, it will come on.
I would replace the blower motor, this sounds like a motor brush problem inside the motor itself.
You need to replace the resister block...it is located on the duct work near the fan... there are two or three bolts holding it and a connector.
Robert
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Followup to problem with 93 Bonneville blower motor working intermittently.....
Banging on the housing from the engine compartment will cause motor to kick on. Electrical or mechanical, I don't have a tester.
We have the same problem again with our bonneville. The first time the blower motor had worn out its brushes. Now, the connector is a bit melted. I think either the blower motors are cheap, or the mouting position is causing problems (probably a little of both). A few months ago is when the 2nd round started. I pulled the blower and the thing had a lot of carbon dust in it. I cleaned it with contact cleaner and that worked (the brushes still had life in them as they should being less than a year old). So look at you connector and the blower motor first. I would bet that you can slightly manipulate the connector and it will go. Almost forgot, the connector on our bonneville had no weatherpak in it which doesn't help keep the connector firmly in the motor's recepticle.
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