AC acting up...

[ford_truck_guy]

This past weekend my air was acting up... I know it was hot but it has never acted like this... On my 2009 6.4... It started to get muggy inside then cold again,,, it would keep this cycle up most of the weekend... On the way home it did the same thing , I turned the thermostat all the way down to 65 ( lowest setting ) ant it seemed to operate ok?? Leaving in 2 weeks for Florida so I want to get this corrected...2 months or so ago the AC would not get any cold air flowing,,, took it in and they said it needed to be charged... It has been ok since till now... Any ideas ?? Thanks in advance .. Joe

[Passin_Thru]

We had one in an airplane act up, told it to straighten up and fly right.

[monkey44]

mudfuel07 wrote:
Check the blend door actuator. It's a common problem if you have the dual zone climate control. Mine acts up now and then, but I'm waiting until it goes out completely, you have to pull the dash.

Could very well be the actuator - when it works intermittantly, it's unlikely the freon charge.

The actuator runs the fan control vents and also controls the amount of warm-cool air mix. It is NOT cheap ...

One other thought - under the hood, you'll have a fuse/relay panel, the relay is a large fuse (sorta) it's like a gate for power to the AC controls. If it's failing, it sometimes sticks in one position or another - either on or off, and will go from one to the other just by turning the ignition key. So, if it sticks open, no AC, if it sticks shut, AC. It will stick one way or the other randomly - so, no way to test it unless you catch it shut when it should be open. Take another relay from your fuse panel and stick it in the slot (40A) and see if the AC works properly - if it works, buy a new relay, might save you a lot of "testing" money.

[45Ricochet]

ford truck guy wrote:
update.. called the dealer and going in Thursday to check the charge... Will see at that point what to do..

Have em use dye this time.

[mudfuel07]

Check the blend door actuator. It's a common problem if you have the dual zone climate control. Mine acts up now and then, but I'm waiting until it goes out completely, you have to pull the dash.

[ford_truck_guy]

update.. called the dealer and going in Thursday to check the charge... Will see at that point what to do..

[Dave_H_M]

Agree, I think it is time to have the charge checked again to rule out (or in) the leak issue.

[ggardne2]

I would suspect the issue lies in your last sentence ... if the A/C needed to be charged it has a leak somewhere in the system. A/C units are closed systems, if they are low on refrigerant the refrigerant is leaking out of the system somewhere. I suspect you have a slow leak somewhere in the system causing it to leak down and loose efficiency.

[sc3283]

intermittent electrical problem?

compressor clutch disengaging and re-engaging due to clearance issues?

evaporator freeze up?

too many possibilities do properly diagnose via a message board