Blend door mixes hot and cold, not a distribution control. Look for loose or dislodged vac lines... Heater designed to fail in defrost mode.
Most times the vacuum lines breaks under the hood. It is routed on the passenger side and goes into the harness. If it breaks inside the harness(which they do sometimes) it is easier to run a new line than find the break. Push it threw a rubber boot or drill a hole in the firewall. Tape the new hose where it goes threw the firewall for better protection. splice it near the controller.
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I have a 05 magnum the on the driver side I have cold air and the passenger side I have warm air coming out I replaced all three blend door and the problem is still there I don't know what it could be. Can anyone help me with this?
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