Can anyone tell me what the duct work temperature should be when AC is on max AC?

 

should be at least 20 degrees difference between the actual cabin
temp and the outlet temperature after running for at least 5 minutes

 

After sitting in the sun all morning in 84°F weather with 51% humidity, I started my truck and set it to max A/C, after driving for 6 minutes the center vent temp seemed to stabilize around 43°F.

 

Not sure but I know these fords will freeze you out.

 

My truck routinely runs at a center dash outlet temp right at 41F anytime the outside temp is above 70F -- even on humid days with outside temps in the 90s (and not on recirc -- cooling outside air by 50 degrees or more). When it is below 70 outside, the blend doors clearly kick in, and the dash outlet temps rise to around 60F.

On a related note, I've never had the evaporator freeze up like some have.

 

GENERALLY speaking around 41 degrees.

 

Since about 2008, my experience, they have been running at or about 40 degrees. I acquired an 08 and did not like the vent temp so I took it to an established local shop. Told the guy I was only getting to 40 degrees and he said that that was great for Fords now a days. The evap temp is "suppose" to cycle at 36-38 degrees according to my Ford Service DVD for my 13, but mine does not. It cycles at about 44-46 which severely impacts the ultimate duct discharge temp. I've had my evap core and temp probe replaced 2 times under warranty, no change so it indicates to me that it is programing since the "hack" in the post called "Computer Cycling Fix", can get it colder.

 

I have a new 2024 F150 Powerboost. Coming from a 19 Raptor, 20 F150, 21 F250. The A/C seems weak on the new truck compared to the past. Maybe it's the electric AC on the Powerboost but the blower seems weaker, and it takes way longer to cool down.

 

New day and new data. Today I hooked my scan tool and gave my truck about 30 minutes to reach steady state operation. The ambient conditions were 77°F and 20% relative humidity. With full blower speed and MAX A/C on, my high side refrigerant pressure was roughly 194psi, my evaporator core temp was 34-37°F and my left center vent temp was consistently 41°F. When dropping the blower speed down to 5, the evaporator core temp was 32-37°F, the compressor started cycling, and my left center vent temp hit a low of 39.2°F.

 

Every F150 I've had since 1999 (six of them) will freeze you out on max a/c. Duct temps are in the 40's. Best a/c on the planet.