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I have the same issue - I have found that if I wiggle the wires at the blower motor - the blower kicks in. I haven't gotten to it yet but I suspect that the plug connector is dirty inside or doesn't have enough pressure to make good contact. I plan on cleaning the connector and maybe bending the contact to create more pressure. As might be suspected, it only fails when it is very cold outside and you really need the blower.

i had the same problem, replaced the blower motor, $45, advanced auto parts, works good now!

I was having the same problem. My husband found a loose connection under the hood on the blower fan.

I also had the same problem. I fount that the cause was a defective wire to the blower control module

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โˆ™ 2015-07-14 16:47:08
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Q: Why might a 1999 Bonneville SSI heater fan blow sometimes and not other times?
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