Question about 1999 Buick Century

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Fan only run on high - 1999 Buick Century

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Probably a bad resistor.

Please see my tip at http://www.fixya.com/cars/r6234839-doesn_t_heater_or_air_conditioner_blow . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Nov 14, 2010

Testimonial: "right on the money thanks"

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3 speed fan barely changes speed


You are talking about your blower fan for the air conditioner and heater right? More information will be needed to solve the problem.

When you say it barely changes speeds, does that mean it doesnt speed up, or doesnt slow down? By that I mean, is it "stuck" on low, or high?

Most blower fans run at different speeds through the use of a multi-stage resistor built into the fan switch circuit. Low speed is a high value resistor, medium speed is a low value one, and high speed is the fan running without any resistance.

If your fan is running on high and doesnt seem to want to run on lower speeds, the resistor pack may be failing. If the fan is running on low speed only, it may be that the fan itself is beginning to fail, or that the lubricant in it has gotten gummy.

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Disassemble, clean and lubricate to make sure fan runs full blast and does not burn out.

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Let me know if this helped....

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I have a 1994 es 300 and my car keeps running hot when the AC is on. It only runs hot when im in town, when im on the highway or in the country it doesnt. my dad replace everything just about! and it still...


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ok. so you know the fan is good. switch out the relay for that fan with another same relay and check with the a/c button.

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Check or have checked the blower motor resistor. This is usually how they act.

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