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Originally Posted by rpm28
Got a new motor for my 98 Grand Prix, also new resistors.....it runs for a few seconds on low speed settings, then I hear a "click" coming from the drivers side and it shuts off. High speed runs fine. There are 3 relays in the drivers side panel....are any of these tied into the heater switch?
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That's not good news. Since you've changed just about everything like the resistor and blower motor you could have a bad ignition switch and harness assembly. The only relay involved in direct blower motor operation is the blower hi speed relay but your position 5 works so you can rule that out. The 12v originates at the switch and feeds the HVAC control head unit.
The ignition switch is a common failure item on '97 - '99 Grand Prixs after age plus wear n tear.