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The temp blend door actuator is located on the HVAC unit behind the dash assembly. To replace the temp blend door actuator the dash assembly needs to be removed. This is a fairly large job with to many steps to post here. If you intend on doing it yourself I would recommend purchasing a shop manual for that vehicle. The manual will pay for itself after the first job.

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Q: How do you replace heater control valve on 99 s10?
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