Static readings should be equal. Initially your low side being so low is similar to stuck expansion valve, but without seeing the gauges when the A/C is first engaged I can't tell you for certain. I can tell you this: Low side pressures, when first engaged, can plummet to below zero and the high side will remain close to static give or take 15psi depending on ambient. The compressor will stay engaged and not cycle due to the low steady pressure on the high side. This can freeze the low side lines, particularly from the valve to the service port. The refrigerant is trapped at the expansion by either a restricted evaporator or the stuck expansion valve. Recovery of the system can be difficult. If any moisture is in the system it will freeze in the evaporator and fight your efforts of recovery until thawed. Unplugging the pressure transducer while the ac is demanded should result in disengagement of the compressor clutch and activate high speed fan operation. In this case of repair the expansion valve was at fault. The valve and desiccant cartridge were replaced. A vacuum of 28"Hg was achieved and held for 2 hours and a leak test was performed. Refrigerant level was charged to spec and a leak test was performed again. The A/C system was retested and all was okay at that time. 8 months since repair and all is still well, as expected. OEM Ford genuine parts were used and as a Senior Master Technician and 17 years with FoMoCo highly recommended. I hope this helps anyone. It was a different and longer than usual diagnosis.
I took a road trip to visit my daughter from Bellingham, Wa to Phoenix Arizona to Las Vegss Nevada to Los Angeles.. i really didnt need my Air conditioner until i got to Death Valley California it wss 100 degrees in April.. my AC stopped working and the fan got stuck on High.. it is so Noisy!!! I unplugged the connector thst goes towards the expansion valve the fan never came on again... Of all places DEATH VALLEY!! Now it is Summer here in Washington and our weather has been 80's and 90's .. i want to fix this thing .. getting too warm Thanks for your content
@@CoolHandLuke43 I had to replace the expansion valve that was the problem. I did it myself then took the truck to a shop to have the AC system recharged. Probably spent $150 total for the recharge and the part.
Something like this is happening with my 2014 F150. Heat turns on and the fans are unbelievably loud. Continue to run after heat turned off. Mechanics said it may be txv valve and high pressure switch. This sound correct?
nice video..i have the same issue..2014.. can you drive the truck with no Freon ? was thinking to do the repair myself, but i would need a shop to evacuate the charge first.. go home to do the repair..
I have the same issue with my truck replaced the expansion valve. Recharged the system 6 months later same problem rescuers. The second time around the compressors clutch will not engage what so ever. Just ordered some gauges so we’ll see what the high pressure sides reading this time.
Mine did exactly the same thing. Air stopped blowing and my cup put freon in it. About 6 or 7 months it quit again and now the clutch won't engage. What did you do?
My 2017 F150 3.5l Ecoboost's high fan comes on about a minute after starting the engine with nothing running like the AC or defroster. I'm wondering if it could be the expansion valve. Very frustrating. ~John
@@CoolHandLuke43 no. I did charge the AC a little and the fan stopped coming on as often. Recently it has started back with nothing on. I'm taking it to the shop next.
@@DenMit1 No, unfortunately. My mechanic added refrigerant hoping that that would work, and it seemed that it did for a day or two. I don't want to spend a troubleshooting fee on a mechanic who may not solve the issue. I might just take it to FORD and have them look at it or maybe an honest FORD mech will tell me what is causing it.
Static readings should be equal. Initially your low side being so low is similar to stuck expansion valve, but without seeing the gauges when the A/C is first engaged I can't tell you for certain.
I can tell you this:
Low side pressures, when first engaged, can plummet to below zero and the high side will remain close to static give or take 15psi depending on ambient. The compressor will stay engaged and not cycle due to the low steady pressure on the high side. This can freeze the low side lines, particularly from the valve to the service port. The refrigerant is trapped at the expansion by either a restricted evaporator or the stuck expansion valve. Recovery of the system can be difficult. If any moisture is in the system it will freeze in the evaporator and fight your efforts of recovery until thawed.
Unplugging the pressure transducer while the ac is demanded should result in disengagement of the compressor clutch and activate high speed fan operation.
In this case of repair the expansion valve was at fault. The valve and desiccant cartridge were replaced. A vacuum of 28"Hg was achieved and held for 2 hours and a leak test was performed. Refrigerant level was charged to spec and a leak test was performed again. The A/C system was retested and all was okay at that time. 8 months since repair and all is still well, as expected.
OEM Ford genuine parts were used and as a Senior Master Technician and 17 years with FoMoCo highly recommended.
I hope this helps anyone. It was a different and longer than usual diagnosis.
I took a road trip to visit my daughter from Bellingham, Wa to Phoenix Arizona to Las Vegss Nevada to Los Angeles.. i really didnt need my Air conditioner until i got to Death Valley California it wss 100 degrees in April.. my AC stopped working and the fan got stuck on High.. it is so Noisy!!! I unplugged the connector thst goes towards the expansion valve the fan never came on again... Of all places DEATH VALLEY!!
Now it is Summer here in Washington and our weather has been 80's and 90's .. i want to fix this thing .. getting too warm
Thanks for your content
I have the exact same symptoms but no gauges to see how the pressure is the only thing I know is when I unplug that switch the fan turns off
The orifice tube?
How did you fix it?
@@CoolHandLuke43 I had to replace the expansion valve that was the problem. I did it myself then took the truck to a shop to have the AC system recharged. Probably spent $150 total for the recharge and the part.
@wilfredo08 Thank you! I will replace mine.
Something like this is happening with my 2014 F150. Heat turns on and the fans are unbelievably loud. Continue to run after heat turned off. Mechanics said it may be txv valve and high pressure switch. This sound correct?
nice video..i have the same issue..2014..
can you drive the truck with no Freon ? was thinking to do the repair myself, but i would need a shop to evacuate the charge first.. go home to do the repair..
You can drive without Freon, only thing that’ll happen is your a/c compressor won’t kick on with HVAC on
I have the same issue with my truck replaced the expansion valve. Recharged the system 6 months later same problem rescuers.
The second time around the compressors clutch will not engage what so ever. Just ordered some gauges so we’ll see what the high pressure sides reading this time.
Mine did exactly the same thing. Air stopped blowing and my cup put freon in it. About 6 or 7 months it quit again and now the clutch won't engage. What did you do?
My 2017 F150 3.5l Ecoboost's high fan comes on about a minute after starting the engine with nothing running like the AC or defroster. I'm wondering if it could be the expansion valve. Very frustrating. ~John
Did you ever fix it?
@@CoolHandLuke43 no. I did charge the AC a little and the fan stopped coming on as often. Recently it has started back with nothing on. I'm taking it to the shop next.
@@07Convertabledid you ever get this figured out? Same situation with my 2017 3.5
@@DenMit1 No, unfortunately. My mechanic added refrigerant hoping that that would work, and it seemed that it did for a day or two. I don't want to spend a troubleshooting fee on a mechanic who may not solve the issue. I might just take it to FORD and have them look at it or maybe an honest FORD mech will tell me what is causing it.
@@07Convertable dang, thanks! I’m about to just trade it in, it’s bugging me so much.