Question about 2000 Chevrolet Silverado

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Blower blows weak with A/C on; When A/C is off blows strong

When A/C is switched on, it blows very weak. When its switched off, the blower blows strong. It blows cool just fine, but I do have a suspicion that it is blowing hot down near the drivers pedals. I believe I have spotted the blend door actuator down there near the gas pedal, and I was wondering if this was the issue. Or what it could possibly be, and how to check.
Its actually a 1997 Silverado 1500.

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This is not a blend door problem. It is a problem w/ your AC / Heater blower motor Resistor. When this goes out some vehicles will blow intermitantly. Others will blow strong in the low position and low on high. On my 2004 Silverado the resistor is located under the glove box mounted w/ 4 screws. It is a small black box no larger than a cigarette package. Laying flat on the floorboard look up and towards the center you shouldn't be able to miss it. Easy to change, simply plug the new one in and screw back in place. Took me 5 min.

Posted on Oct 07, 2009

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