Pontiac Problems? Ask a Mechanic for Answers ASAP
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Why do you say high speed isn't working? Is vehicle overheating?
High speed isn't supposed to turn on until 230, are you monitoring temp with scan tool?
I agree, it shouldn't even need high speed fan. Since it is getting so hot it sounds like your radiator is getting clogged. I'd personally start by replacing thermostat and if that doesn't help replace radiator. As far as cooling fan issue, I would connect a scantool to make sure actual temp is reaching at least 230 which can be done at oriely auto parts for free, if not then everything is fine and gauge just isn't that accurate. If it is going over 230 but high speed is not coming on that would mean the PCM has failed. Since high speed works with AC on that proves wiring is good. Let me know if you have more questions, thanks.