Donald Feeney

I’ve got a 2013 xlt with the 5.0
my AC isn’t blowing as cold
clutch engages and stops then engages and stops
radiator fan comes on and it never did before.
i want to change my pressure sensor / switch but.... I CANT FIND IT!! Or the accumulater ???

RL1990

No more accumulator the truck uses a TXV and the pressure sensor could be in a refrigerant line or at the condenser. Also the fans are always commanded on when the A/C is in operation, usually at low speed. The A/C is controlled by the computer.

Roughneck12

I had the same problem last year. Released some dead pressure from the low pressure side and voila, fans stopped.
i later recharged the system and the AC finally worked properly.
In my research I didn’t find much info. Plugged/ unplugged switch. Checked fuses and replaced relays. Saw one vague reference to trapped pressure so I relieved the trapped pressure on a chance and the issue went away. Just a hiss of air for a few seconds.

IGOTM9

For the past 7 months I have lived with an ever annoying loud fan problem with my F150. By shear coincidence (I think) my issue started almost to the day I changed my water pump and T-stat. After running the truck for about 5 minutes my cooling fans would go into take off speed and the truck sounded like a jet engine on afterburner. I did everything from changed the T-stat a second time, questioned and inspected the new water pump for damage to the impeller, replaced the AC pressure switch, vacuum lifted the air from the system, pressure tested the radiator, flushed the system, changed fuses and relays and evacuating and refilling the AC system. All this cost me time and ridiculous money to say the least, let alone the amount of odd facial expressions I received from anyone within hearing distance which in my case seemed like miles away.

The fix: a great shop finally put a set of gauges on my refrigerant system and found that my pressures where through the roof on the high side line. The root cause was determined to be a faulty AC expansion valve at the firewall. Once diagnosed and replaced the truck is once again my pride and joy and not something I dreaded getting in and being not seen but heard driving.

Not sure if this will fix your truck(s) or not but worth looking into.

James1418

How much was the replacement ac expansion valve to replace? Mine has all the same issues. Exactly as you described them.

Rodd mason

Thanks for the info I’m dealing with the same issue started my truck on afternoon and the fan was blowing 100% for no reason took it to the dealership and I was told that my thermostat was stuck in the open position and as a result the fan was blowing high and it caused some leakage from the radiator hoses $1200.00 I paid the $150.00 for the diagnostic inspection and took my truck back when they brought it to me the fan was blowing normal it was about 30 degrees at the time but I didn’t wan to turn on the heat when I got 10 min away from my house I turn on the heat sure enough the fan started blowing at 100% I bought the thermostat today and installed it and it didn’t fix anything. I unplug the AC switch tomorrow and see what happens.

maco

I know I'm resurecting an old post here.....I have a 12 & a 11 with the 5.0....8-10 months apart both thermostats were changed with after market stats while performing other work (hoses)...
On both trucks....... fans would stay on high (screaming) after warming up......(above was grossly compounded if it was a much warmer day !!! )
It seems aftermarket stats "DO NOT WORK" .......My fix was to have garage reinstall OEM stats only !! Immediate fix !!
My guess would be tooo much or insufficent flow through the system !!!!!

Also just my opinion 170 degree stats are not bringing engine to designed operating temperatures !!

BradH002

2014 F-150 5L. I just this afternoon replaced that sensor. $50 @ dealer, cheaper on Amazon. Taking the truck on a trip. Let you know if that fixed the issue.

FunPhantom

Same thing was happening to my f-150. I unplugged the compressor line sensor then plugged it back in and it seems to have fixed it!

jcpease

digitaltrucker: What dealer was that, that fixed your truck after you called a friend? Was it Autonation Katy or somewhere else? I'm in your area - Hockley - and like to know which shops are the best. I'm having AC/Fan problems currently, but think it is my pressure switch. I just replaced the expansion valve due to high pressure. That helped on pressure but still not right, only cooling about 20 deg at vent. My AC clutch runs 100% of time. Both fans cycle together from off to high repeatedly. Pressures appear that compressor is only working when fans are on high, although clutch is running all the time. 2010 F150 5.4L