Could be the air blend door for the rear is stuck in the heat position/vacuum and actuator problem here is a guide that will walk you through the repair
Please let us know if you need anything else to get the problem fixed.
Jul 22, 2011 at 2:15 AM
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Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.