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Re: 93 Cheyenne heater issues...
The actuator for the heat door is located behind the middle of the dash. When mine went bad, I removed the glove box and the stereo (where the tape deck used to be). That gave me enough clearance to replace it.
Make sure the heater core is not clogged. Check both hoses going to the heater core. If one is alot colder than the other, the core may be clogged.
//2000CAYukon
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