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most likely cause is the heater control valve under the hood on the passengers side near the firewall. Look at the control valve and cable for a crusty dry residue leaking from valve onto cable. If there are signs of a leak the fluid tends to travel down the cable causing it to seize. Once this happens the servo bends the cable on the inside of vehicle. It is very easy to replace the valve and cable, but make sure you tape the cables together to help feed the new one through.

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