AC problem- can’t figure it out

[Florida86385]

Hello,

I joined this forum to seek help on issues I’m having with my 2015 Ecoboost.

-AC started blowing warmer and warmer air over few days, then cool went completely out.
-I checked the fuses, all good, so figured let’s do AC Recharge as I’ve never had the AC serviced, and I live in Florida after all
-got this AC Pro package with Super Seal + R134a can. Put in the Super Seal (without checking levels first, yes a mistake.. Or checking if the ac clutch was engaged, 2nd mistake)
-then went in to add R134 and the meter showed green, still no cool air obviously -> my wtf moment
-checked if the clutch is engaged, NOT
-checked all the fuses, the switch by swapping it with horn switch-> all good
-jumped the switch -> clutch engaged, no strange noises
-meter still shows green level, still no cool air
-getting an UV light to check for leaks tomorrow

where’s my problem, what did i miss? Thanks in advance.

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[ugstang17]

If there is no voltage at the clutch when the compressor is being commanded on, the next thing to check would be the AC refrigerant pressure cutout on the primary AC loop. Not sure where it will be on a 15+ but it will be on the pressure side of the loop as I recall and it has two wires going to it. I had some work done years ago and they forgot to reconnect this on my then 2005 GT. You should have 12vdc on both sides of the pressure switch. you can always pull the connector and jumper across it to see if the compressor starts workign as well. If it does then you have a bad pressure cutout switch

If the unit is a climate control (knowing these things helps so try p[roviding the information in the future when you want help - it minimizes speculation and assumption) try turning the climate control unit as low as it will go (LO). Then see if the compressor starts cycling. If it does and cold air starts blowing move the climate control only 1-2 degrees up. If the unit automatically goes to blowing hot air again you likely have a bad in cabin temp sensor. Had this problem on a buddy's 2008 F250 with climate control. Replacing the in cabin temp sensor resolved his problem after we troubleshot it together. Everyone kept saying blend box motor. After I finally convinced him to check this he did so and found it was reading wide open resistance.

If these checks are good then you can move on. But they are checks that have proved for me to be fixes on AC systems I have owned or helped others with.

 

[Florida86385]

Thanks man. Looked at some videos and there’s quite a bit of disassembly work to actually get access to the radiator. I’ll check further tomorrow in the daylight.

 

[Florida86385]

Next thing is to see if the clutch is actually getting voltage to it. If it is you likely have a bad compressor clutch. If there is no voltage at the clutch when the compressor is being commanded on, the next thing to check would be the AC refrigerant pressure cutout on the primary AC loop. Not sure where it will be on a 15+ but it will be on the pressure side of the loop as I recall and it has two wires going to it. I had some work done years ago and they forgot to reconnect this on my then 2005 GT. You shoudl have 12vdc on both sides of the pressure switch. you can always pull the connector and jumper across it to see if the compressor starts workign as well. If it does then you have a bad pressure cutout switch

If the unit is a climate control (knowing these things helps) try turning the climate control unit as low as it will go. Then see if the compressor starts cycling. IF it does and cold air starts blowing move the climate control only 1-2 degrees up. If the unit automatically goes to blowing hot air again you likely have a bad in cabin temp sensor. Had this problem on a buddy's 2008 F250 with climate control. Replacing the device resolved his problem after we troubleshot it together. Everyone kept saying blend box motor. After I finally convinced him to check this he did so and found it was reading wide open resistance.

If these checks are good then you can move on. But they are checks that have proved for me to be fixes on AC systems I have owned or helped others with.

good insight. Couple questions/comments:
-I believe the switch that i jumped is connected to the pressure sensor and the fact that a) there is pressure in the system (assuming the AC recharge meter works) b) jumping the switch turned the clutch on ->pressure sensor may be deflected. However, if that was my only issue it should start cooling when the clutch engaged, but it didn’t
-on to the comment on clutch voltage- if it engages, wouldn’t that indicate there is voltage as such? Or am I missing something?
-lastly, there is 0 cool, just warm/hot with the low setting. This leads me to think its ‘mechanical’ rather than electrical issue

Thoughts?

 

[Rapid Red]

Sometimes the more guessing and part changing for a problem. Not having the skills to troubleshoot. Create more problems, and every additional problem created, raises the cost of the repair.

Without knocking anyones advice, AC needs hands on .

Clutch not getting voltage. Don't forget, low pressure (freon) will hold that off...

 

[ugstang17]

good insight. Couple questions/comments:
-I believe the switch that i jumped is connected to the pressure sensor and the fact that a) there is pressure in the system (assuming the AC recharge meter works) b) jumping the switch turned the clutch on ->pressure sensor may be deflected. However, if that was my only issue it should start cooling when the clutch engaged, but it didn’t
-on to the comment on clutch voltage- if it engages, wouldn’t that indicate there is voltage as such? Or am I missing something?
-lastly, there is 0 cool, just warm/hot with the low setting. This leads me to think its ‘mechanical’ rather than electrical issue

Thoughts?

If jumping the unit and the compressor did kick on which did not result in cold air blowing then you have other issues. Sounds deeper than you may wish to go and it is deeper than I can go with you without a schematic for the electrical side. I only have 2005 and 2011 schematics. Sorry. Good luck.

 

[ugstang17]

Sometimes the more guessing and part changing for a problem. Not having the skills to troubleshoot. Create more problems, and every additional problem created, raises the cost of the repair.

Without knocking anyones advice, AC needs hands on .

Clutch not getting voltage. Don't forget, low pressure (freon) will hold that off...

Who's playing shotgun troubleshooting (that is what its referred to when you just throw parts at a problem) or guessing? I have helped the guy try to eliminate probable causes that I know have caused problems from personal experience troubleshooting similar problems. If you have nothing of technical expertise to add shut the f&Ck up.

 

[Lime1GT]

Did you check the A/C clutch relay #57 in BJB? Did you check Fuse 23 {10amp} and 42 {15amp} in the battery junction box {BJB}?

 

[Rapid Red]

Who's playing shotgun troubleshooting (that is what its referred to when you just throw parts at a problem) or guessing? I have helped the guy try to eliminate probable causes that I know have caused problems from personal experience troubleshooting similar problems. If you have nothing of technical expertise to add shut the f&Ck up.

AKA known as cherry picking,


Friend, I was plainly not speaking about or to you. As a young man you may have had your self esteem stroked constantly ? Now insecure thinks all things are all about you?

I've probably forgotten more about troubleshooting then you will ever know.

Grow up

Comment primarily meant for the OP.

 

[Gregs24]

Hello,

I joined this forum to seek help on issues I’m having with my 2015 Ecoboost.

-AC started blowing warmer and warmer air over few days, then cool went completely out.
-I checked the fuses, all good, so figured let’s do AC Recharge as I’ve never had the AC serviced, and I live in Florida after all
-got this AC Pro package with Super Seal + R134a can. Put in the Super Seal (without checking levels first, yes a mistake.. Or checking if the ac clutch was engaged, 2nd mistake)
-then went in to add R134 and the meter showed green, still no cool air obviously -> my wtf moment
-checked if the clutch is engaged, NOT
-checked all the fuses, the switch by swapping it with horn switch-> all good
-jumped the switch -> clutch engaged, no strange noises
-meter still shows green level, still no cool air
-getting an UV light to check for leaks tomorrow

where’s my problem, what did i miss? Thanks in advance.

Seriously - you need to get to an AC specialist rather than trial and error. The system needs a vacuum test to check for leaks and remove any moisture. Once they have established there are no leaks, refilled with the correct quantity of refrigerant / oil then they can move on to other diagnostics. It doesn't need to cost a lot of money, there are plenty of AC specialists about (especially in Florida!) You have done all the basic stuff and even tried the risky home refill so nothing much more you can do. (I say risky because putting R134 into a system that has not been emptied and tested, and the quantity required correctly filled then there is a risk of damage / waste of money - don't forget overfilling can damage the compressor)

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