Hey guys so i have 2015 f150 xlt 5.0
first radiator fan was always running on high when ac on. Some people said ur expansion valve or ur pressure switch . So I replaced both of them. Vacuum the ac and refilled it . Fan still does it . So I turned off the truck. Took a break , turn it back on and now my radiator fan or the ac fan none of them engaging. Checked the compressor it runs when ac is on. Plugged it to forscan; everythint came normal and the computer telling the truck to engage low speed and high speed but none of the fans are working!! And that cause my high pressure on the ac line to go up and the truck tk get hot. Checked fuses and relays, checked relay 114 70 104 which shows they are the fan relays on the manual and they all were good unless other fuses or relays that you know or recommend to check also? I am running out of ideas and I am getting tired


I know some folks said use the oem thermostate which I will and some said the coolant temp sensor but I haven’t replaced that yet I am just tired

First I was trying to get the fan to go to normal and not kick in like loud airplane when the ac engages and now it doesn’t turn on at all none of them work

any help I would really appreciate it

 

From 52merc:

 

that diagram for eco boost mine is 5.0 does that matter ?

 

I checked all those fuses they look fine visually should I replace them as well ?

 

Can you monitor temperature via a scan tool? How about monitoring the A/C pressure via a scan tool (NOT with external gauges).
Leave the A/C off and let the truck run. Will the fan eventually come on as coolant temperatures require?
Do you have a failing a/c pressure sensor that is not accurate, therefore the ecm doesn't see enough pressure to turn the fan on?

 

I already replaced the ac pressure sensor when I checked with forscan for the ac pressure sensor it shows it’s reading fine, I haven’t waited too long but with forscan I waited until the coolant temperature reached 180 and none of the fans kicked in. Even tho it shows in forscan a command sent and the low fan or high fan is on but it’s not actually on

 

I already replaced the 2 50amp fuses
the 10amp fuse and I even ordered new relays and 25amp fuse to put to see if it will work . It just strange how all the sudden it stopped working

 

Have you checked the voltage going to the fans at the fuses, relays and at the fan connectors? Unlikely but maybe something happened to the fans.

 

I have a voltmeter can you tell me how can I check plz? Maybe something happen to the actual fan motor and decided to go bad ?

 

In post #2 is the schematic for the fan circuit. Find the fan connectors and check for voltage when the fans should be on. If none there go back to the relay and do the same.