If the blending door are mixing door won't open or close on a 2004 Navigator A/C system does it need freon

need to know if the cause for the blending door not opening and closing a result of low freon

If the blending door are mixing door won't open or close on a 2004 Navigator A/C system does it need freon
No. Freon only cools the air, it would have nothing to do with the airflow.





You may have an issue with the switch or your vacuum system.
Reply:Nice site, Rick.
Reply:Usually a broken plastic vacuum line going from the switch to the vacuum motor.





Start by disconnecting the vacuum motor and moving the blend door by hand to make sure it's not binding. If it moves freely, then apply vacuum to the motor and see if the motor is good. If it is, then your problem is either a broken line or a bad switch.





Rick





I'm a retired ASE Master/L-1 Technician. I still keep current with the latest automotive technology. Visit my blog for cool articles and TSB's: http://free-auto-repair-advice.blogspot....
Reply:This door is operated by a motor.If the motor is turning when you change temps, the blend door (it is plastic) is broken.Ford used to have a problem with its trucks and SUVs but not too sure about this newer model.If the motor is not working the poss a control head(switch)