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Have you driven a Ford lately?

Anyways, if this is a Ford you probably have a blend door actuator problem or a cracked blend door. This can get expensive. If you read your owners manual (and most people don't) you would not have this problem.

If it's a GM (especially with dual-zone climate control) you might have a software problem that can be corrected by disconnecting the battery for ten minutes or by installing updated computer software.

If you have something else, it is not a problem that I have seen often. Please specify vehicle. Its a 99 GMC Jimmy S10 blazer. I agree that its probley the blend door acuator. I am having diffeculty locating it so I can test it. I ahvent been to the library yet to lookit up. Thanks for your input Dan

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Q: You could hear a motor or somthing turnning under the dash when the heat was on It would blow cold hot cold hot and continue until you shut it off The controls work as far as changing the blower spe?
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