Compressor cycling fix
10-08-2014, 01:05 AM
#141
Senior Member
Froze me out when I left, never has worked like that. Only lasted until today when 90 plus degree weather hit and it returned to what it was doing.
Took it back, got crappy rental and they have it. Last I heard them say was PCM again, thermister and full battery of tests one more time.
BTW they determined the HPS was shorting via the PCM. It would give different voltage readings so they replaced it. While connected to the Computer, the tech observed the up and down of the coil temp. But he did not know why it was happening!
So its at the dealer! I think this is the last hurrah! Then its either: grin and bare it, sell it or go to arbitration.
Will advise when I get it back in a day or so.
10-08-2014, 01:30 AM
#142
That's the learning Curve of the ECU. They update it, the AC freezes you out, U turn it back some to comfort level, the ECU learns it and sets it that way forever. : > /
10-08-2014, 02:01 AM
#143
Senior Member
If its that simple,, tell me and I will call them and tell them to reset again!
Is the ECU the same as the PCM?
Last edited by digitaltrucker; 10-08-2014 at 02:03 AM.
10-24-2014, 12:25 AM
#144
update
I now have 172500 miles. A/C still has the 10k ohm potentiometer installed. Cooling great. As the outside temps get lower, more chance of it freezing up. When the vent temp drops to around 30°, I turn off the a/c selector off. Just let the fan run till the vent temp rises. I may put a on/off switch on it. As done by rymax101.
The following 2 users liked this post by Bigdog364:
digitaltrucker (10-24-2014),
Lampie (08-24-2019)
10-24-2014, 08:42 AM
#145
Senior Member
10-24-2014, 09:01 AM
#146
Still cycling
I had my box, evap coil, and sensor replaced last week on my 2014 F150. Nothing has changed. It does get down to 43 on a lower fan speed but it still cycles every 10-15 seconds. When it cycles the temps go up anywhere fro 2.5 to 5 degrees. I'm tempted to do the potentiometer fix. I saw the computer when he dealer had it and the evap coil sensor was only getting to 41 then cycle. I have contacted ford customer service. I want one of the field engineers to come take a look at this issue. Something is not correct with the system. Any ideas. I'm in the dfw area.
10-24-2014, 09:08 AM
#147
Senior Member
I had my box, evap coil, and sensor replaced last week on my 2014 F150. Nothing has changed. It does get down to 43 on a lower fan speed but it still cycles every 10-15 seconds. When it cycles the temps go up anywhere fro 2.5 to 5 degrees. I'm tempted to do the potentiometer fix. I saw the computer when he dealer had it and the evap coil sensor was only getting to 41 then cycle. I have contacted ford customer service. I want one of the field engineers to come take a look at this issue. Something is not correct with the system. Any ideas. I'm in the dfw area.
Well that's definitely not good news since on mine they said with the temp swing in the coil, it had to be related to the temperature probe. My swing was noticed by the Service manager and he said that unlike others he had seen, mine only did it when the ambient temp was 90 or greater.
Mine worked correctly one time: after they initially replaced the high pressure switch. But it was short lived.
What did they say to you as to what was next?
10-24-2014, 09:08 AM
#148
I had my box, evap coil, and sensor replaced last week on my 2014 F150. Nothing has changed. It does get down to 43 on a lower fan speed but it still cycles every 10-15 seconds. When it cycles the temps go up anywhere fro 2.5 to 5 degrees. I'm tempted to do the potentiometer fix. I saw the computer when he dealer had it and the evap coil sensor was only getting to 41 then cycle. I have contacted ford customer service. I want one of the field engineers to come take a look at this issue. Something is not correct with the system. Any ideas. I'm in the dfw area.
BTW, just took my 2006 vette out yesterday and I had to turn the A/C down, my hands got numb from the cold A/C.
10-24-2014, 09:19 AM
#149
Senior Member
How did you get them to do anything? Had mine in twice since new and mine blows 45 at the coldest (when 89 ambient) and Ford service tells me that's just fine.
BTW, just took my 2006 vette out yesterday and I had to turn the A/C down, my hands got numb from the cold A/C.
BTW, just took my 2006 vette out yesterday and I had to turn the A/C down, my hands got numb from the cold A/C.
That plus the fact that he himself drove the truck added credit to the pictures, along with them seeing the fluctuation within the computer system. Which is not normal according to him. I think the last pic I sent him was ambient 79 and a vent temp of 52 degrees.
Mine is like a box of chocolates: you never know what the day is going to bring.
So to answer your question: perseverance, pictures and a lot of time. BTW Ford participates in the BBB Autoline arbitration process as a last resort. Well second to last, I guess selling the truck is the last resort.
I talked with a guy at Wendys just the other day. He was in a 14, he said his freezes him out but he has a friend with a new 14 Platinum and it does not work well at all!
So it looks like the problem is still out there, hit and miss! You would think that here in Houston with lower ambient temps and humidity that I would be semi ok, but that is not the case!
10-24-2014, 04:57 PM
#150
Senior Member
To check the sensor you need to use a DVOM and see how many ohms of resistance compared to your ambient temperature. Pressure is not what your checking here, but is always good the know when checking the whole system.
When checking the sensor make sure the ac has not been used for a while so the sensor is stabilized to ambient air.
When checking the sensor make sure the ac has not been used for a while so the sensor is stabilized to ambient air.
And then if the ohms and temp don't match the chart then the probe is an issue?