Write up on how I made my not so great A/C a little better.
03-16-2015, 12:44 PM
#322
Junior Member
Digitaltrucker,
Been following this for a while. Not wanting to hijack this thread but here is a link to a new thread I started concerning my own HVAC issues. You may find it interesting:
https://www.f150forum.com/f38/2012-a...s-both-293783/
Been following this for a while. Not wanting to hijack this thread but here is a link to a new thread I started concerning my own HVAC issues. You may find it interesting:
https://www.f150forum.com/f38/2012-a...s-both-293783/
The following users liked this post:
digitaltrucker (03-16-2015)
04-02-2015, 09:23 PM
#323
Senior Member
Mine is going back this week as weather warms. After replacing the "the Box" under the dash which is a complete new evaporator coil assembly and coil temperature probe, nothing is better.
The key from what I can tell in watching the tech with the computer connected to my truck is:
The operation of the coil temperature probe. My old one would cycle at 44-48, they acknowledged that this is far from the 36-38 which is what it should constantly maintain. So what is causing the operational temperature variance and swing, is the question! Whoever figures this out is the genius!
Either I have yet another defective coil temperature probe or there is still something that is tell this probe NOT to operate within specs, by cycling out of specification.
Looking at the hack and seeing that it causes the system to override its own coil temperature probe readings, which causes the temp (evaporator coil) to get very cold as it should, leads me to believe that either the probe is still bad or the PCM which controls it or some other sensor talking to it, is bad.
While insulation of the line is a great idea, its not the problem here with these units and certainly wont hurt.
No expert here, just trying to narrow it down.
The key from what I can tell in watching the tech with the computer connected to my truck is:
The operation of the coil temperature probe. My old one would cycle at 44-48, they acknowledged that this is far from the 36-38 which is what it should constantly maintain. So what is causing the operational temperature variance and swing, is the question! Whoever figures this out is the genius!
Either I have yet another defective coil temperature probe or there is still something that is tell this probe NOT to operate within specs, by cycling out of specification.
Looking at the hack and seeing that it causes the system to override its own coil temperature probe readings, which causes the temp (evaporator coil) to get very cold as it should, leads me to believe that either the probe is still bad or the PCM which controls it or some other sensor talking to it, is bad.
While insulation of the line is a great idea, its not the problem here with these units and certainly wont hurt.
No expert here, just trying to narrow it down.
04-02-2015, 09:39 PM
#324
Senior Member
Yes, that evaporator temp probe sensor is suppose to regulate the compressor and maintain an evaporator temp between 36-38 degreef F.
Yes that same probe is what others are using a "hack on" to get it to stay on.
I am working to get mine back in the shop, still not working correctly.
Whenever mine was in, the Service Manager stated that I should see a constant vent temp and you should not be able to see or feel the cycle swing when the probe operates between 36-38, cycling the compressor.
While this dealer has been helpful and Ford Inc useless, this is my last go with the dealer, then arbitration. Final step will be to trade it off.
The following users liked this post:
celltech (04-04-2015)
04-04-2015, 07:52 AM
#325
Senior Member
Mine is a little better after I wrapped the line but it's still subpar with other vehicles I own and or drive. When the compressor is on it starts to get nice and cold but then it kicks off and gets too warm.
Has anyone successfully got the dealer to replace the probe under warranty? How much is the part and how how hard is it to just install ourselves? Thanks
Has anyone successfully got the dealer to replace the probe under warranty? How much is the part and how how hard is it to just install ourselves? Thanks
04-04-2015, 11:51 AM
#326
Senior Member
Mine is a little better after I wrapped the line but it's still subpar with other vehicles I own and or drive. When the compressor is on it starts to get nice and cold but then it kicks off and gets too warm.
Has anyone successfully got the dealer to replace the probe under warranty? How much is the part and how how hard is it to just install ourselves? Thanks
Has anyone successfully got the dealer to replace the probe under warranty? How much is the part and how how hard is it to just install ourselves? Thanks
The probe is part of the evaporator, so it is all replaced as one unit, at least that is what happened on my 2013. Mine is all over the chart now. Usually fluctuates between 44-48 at the left vent. Its just very strange and Ford needs to figure out what is telling the prope to cycle at 44-48 and not the spec of 36-38.
You cannot just replace the probe, no separate part! Yet another ford has a better idea!
04-04-2015, 01:47 PM
#327
Senior Member
The most interesting part of thus whole ordeal is that some trucks cool really good. Why can't Ford figure this out? I also can't stand it when people just say run in on max all the time. This is the 1st vehicle I have owned where I even have had to run it on max.
04-04-2015, 01:56 PM
#328
Senior Member
For those of us with issues, it boils down to what controls the evaporator temp probe, provided it is not defective: which from what I understand is the PCM and the AC Controls.
Took my wife to the doctor the other day in her Edge. AC was set at 72, no max or recirc and it was freezing us out, 80 out! We laughed because she knew my truck would be pitiful!
04-04-2015, 02:06 PM
#330
Senior Member
It work when I left the dealer, froze me out and I stopped for lunch. Got back in the truck, started and it reverted back! Since then they have replaced the Evaporator Core with temp probe and there is no difference.
They saw via the ford computer system, that the Evap Temp Probe was not holding a temp within the acceptable spec range of 36-38, so they replaced it.