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Jeremy, Certified Diesel Technician/Electrician
Category: Ford
Satisfied Customers: 3304
Experience:  ASE, NATEF Engines and Electrical certified, EPA 608/609
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I have a 2011 E 450 manual ac. some times the ac leaves the

Customer Question

I have a 2011 E 450 manual ac. some times the ac leaves the vents and goes to the defrost and hot air coming out of the vents. sometimes its in a pull but still stays there after leveling out. it does not always come back to the vent immediately. does
this have a vacuum reservoir as well as a electric door actuator. and where are they located. and ideas
Submitted: 1 year ago.
Category: Ford
Expert:  Jeremy replied 1 year ago.

My name is ***** ***** I will assist you.

Yes, this system runs on the engine vacuum system.

Can you check something? Go under the hood on the passenger side and where the vacuum lines come out of the firewall, chase that line and see if you have any cracks or breaks along that line. They are notorious for drying out and cracking. If you find a crack or break, just put a piece of 5/32" OD rubber hose on it and it will seal that leak.

Another spot where they break is on the back of the head until There is a spot where the hose goes and it is held with 2 screws. They break a lot there and will cause this to happen.

If no breaks, then I would check for a seal leak on the blower box at the actuators to see if they are leaking.

I wanted to mention the other spots because I see those all the time. Especially that line under the hood. It gets dry rotted from the engine heat and breaks all the time.

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