A/C compressor wont turn on

Tiny
FRUSTRATEDFUSION
  • MEMBER
  • 2007 FORD FUSION
  • 122,000 MILES
A/C quit working some time ago and I am finally getting around to fixing it. I brought it in to the dealer to have a diagnostic done on it and they said to change the evap. Temp. Sensor. So I completed that and the compressor did turn on when I finished the job. It was late and the next day when I went to use the car the compressor wouldn't turn on anyore. I ran it for about 3 minutes the night that I did the repair. I brought the car back to the dealer and they rescanned the car, coming up with codes for a stuck cooling thermostat (anti freeze). Low battery voltage and some communications error that they said was probably from disconnection the battery when changing the sensor. I have all the electrical diagrams for the a/c but am running out of ideas to check.
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Tuesday, June 4th, 2013 AT 6:32 PM

13 Replies

Tiny
HMAC300
  • EXPERT
Is it full of Freon? Have apro run a performance test on it. You dont' need a dealer for that
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Wednesday, June 5th, 2013 AT 6:25 AM
Tiny
FRUSTRATEDFUSION
  • MEMBER
I am a residential HVAC tech by trade and yes it does have the correct charge when the compressor is jumped with the battery terminals. But when I do that it does bog the car some but the alternator brings the amps back up to 14.3 quickly
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Wednesday, June 5th, 2013 AT 9:02 AM
Tiny
HMAC300
  • EXPERT
Check the fuses in pic as they are different for late and early production. Then check where arrows are to see if pcm is turning on a/c relay meaning does it have power check the other relay as well as that can effect it. When the ac/ is on the #2 fan should kick in and the idle should go up if working properly
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Wednesday, June 5th, 2013 AT 9:37 AM
Tiny
FRUSTRATEDFUSION
  • MEMBER
I will check them tonight but how am I supposed to check the power on the pcm relay with the relay plugged in, I can't access the terminals w/ my meter. I will try to put jumpers from the relay into the slots where the relay would plug into and see what I come up with.
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Wednesday, June 5th, 2013 AT 1:41 PM
Tiny
HMAC300
  • EXPERT
Just leave your meter to any ground one will be hot maybe two then see if pcm slot turns the relay on. On bottom of relay it should have a number and it will be 86 plug your positive side of meter and see if it's getting power or not. If it is try a like relay then see if it works. Then probe 85 of a/c relay as well as 30 if you aren't getting power to 30 on ac relay it will have to in order to work clutch hope fully you can enlarge the thumbnail so you get a better idea.
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Wednesday, June 5th, 2013 AT 1:49 PM
Tiny
FRUSTRATEDFUSION
  • MEMBER
Ok so I did some checking and this is where im at, with the key in the on position I have 12 volts to terminal 85 and 30. The ac relay has power on terminals 1 and 3. But what I found odd is that with fuse # 47 out in my hand I had 12.29 volts on one side and 10.32 volts on the side. So that tells me the pcm relay is sending the power through but the pcm wire to the ac relay isn't closing ground to pull the relay closed. I tested the relay and its working normal.
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Thursday, June 6th, 2013 AT 6:59 PM
Tiny
HMAC300
  • EXPERT
If you put fuse 47 in and test you should have power at post86 ifnot there is a short there. Although you will need a/c on to do this. Then it should activate relay and send power to a/c clutch. Also check ground on clutch at front of engine compt. Only one other thing if this is automatic temp control where you set the tem p this is all wrong an dyou have to scan it to find out if you have a bad sensor someplace.
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Friday, June 7th, 2013 AT 6:10 AM
Tiny
FRUSTRATEDFUSION
  • MEMBER
The ac switch was lit up on the climate control, while I was testing. I do not have automatic climate control, just dials for hotter and colder. I do have power at terminal 86 on ac clutch relay. I have tested ground for the compressor and it is good, I even ran a new ground temporarily straight from the battery to double check. It doesn't seem like I have any activity from terminal 85 on ac relay "the white and brown wire" that runs to the pcm. How can I test that?
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Friday, June 7th, 2013 AT 7:07 AM
Tiny
HMAC300
  • EXPERT
I just went to tips and found this check this part and it may solve your problem you aren't going to like where it is though. If no operation and everything checks out good replace the evap core temp sensor they are very known to fail making you think its a bad compressor (replace that sensor first)

. See the attached figure from the 2007 Ford Fusion component locator article for the A/C Evaporative Thermistor. It is shown in that article as figure 20.

It is found behind the right side of dash, and I understand you can see it looking through the defroster grille
the dash may have to come out to get to it.
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Friday, June 7th, 2013 AT 9:38 AM
Tiny
FRUSTRATEDFUSION
  • MEMBER
I had already changed the evep. Temp sensor behind the dash. It took me 5 hours and it worked for 2 minutes. I brought it back to the dealer and they scanned it saying the new sensor is reading correctly. I know my compressor is fine, I just can't get the car to send power to the compressor.
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Friday, June 7th, 2013 AT 10:52 AM
Tiny
HMAC300
  • EXPERT
I don't know what to tell you i'm out of ideas, see if you can reach hand by sensor and see if it is connected Other than that I don't know what the heck to tell you. Otherwise get it scanned and see if anything comes up bad onit.
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Friday, June 7th, 2013 AT 12:04 PM
Tiny
FRUSTRATEDFUSION
  • MEMBER
I already had it scanned and nothing came up faulty. They tested the sensor on there diagnostic machine and it is reading correctly. Well thanks for your time.
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Friday, June 7th, 2013 AT 1:34 PM
Tiny
HMAC300
  • EXPERT
This has been bugging the crap out of me about this. After finally finding the correct diagram the evap switch gets it power from the pressure switch. Jump that switch and see if your a/c clutch turns on, if it doesnt' then either the pressure switch isn't pressing the Schrader valve to activate it or the switch is bad or it's a poor connection if the a/c clutch kicks in. Unfortunately the pressure switch is in the engine performance section go figure. It shold be in firewall area depending on which engine you have as there are three different ones for that car. Hope it works.
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Saturday, June 8th, 2013 AT 8:53 AM

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