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I think my compressor is dying

knightgang on Wed September 11, 2013 9:31 AM User is offline

Year: 2003
Make: Ford
Model: Excursion
Engine Size: 6.0 PSD
Refrigerant Type: R134A
Ambient Temp: 90
Pressure Low: 25
Pressure High: 120

So, my Excursion has not been cooling well for a while. I have noticed a leak in a suction line from the Rear AC just before it rejoins the primary suction line coming out of the accumulator. Back in June, I added about 4 oz of R134A and it cooled a little better for a short while, but now is will only produce slightly cool air and the suction lines will not even get cold to the touch.

When I first put the gauges on, the pressures were about 45/250. I figured this was actually about were they should be, but it would not cool. I know the fan clutch works because we just completed a camping trip towing our 35' camper and I could hear the electric clutch engaging and disengaging with no issues on engine temp.

I did grab the water hose and spray down the condenser and that is when the pressures dropped to about 25/120. I figured at that point, if the pressures were that low, that it should be able to take in some Freon, but it would not suck it out, the can would not even get cold.

So, my assumptions are these:
1. My compressor is dying and is loosing suction
2. Due to the compressor dying, I think that particles have managed to begin plugging up the O Tube.
3. These two issues combined have severely degraded the cooling capacity of the AC system.

Can anyone provide their option on my diagnosis?

mk378 on Wed September 11, 2013 10:50 AM User is offline

25 psi will pull refrigerant out of a can, if your can tapper is working properly. Looks to be seriously undercharged. You should start with a full recover, fix the leak, and recharge by weight to spec-- that's the only way to know if the problem is the charge level or something else. While the system is empty you can check the OT. I don't think that 4 oz is going to do much for a full size SUV with dual air.

Edited: Wed September 11, 2013 at 10:53 AM by mk378

Cussboy on Wed September 11, 2013 12:21 PM User is offline

Quote
Originally posted by: knightgang
So, my Excursion has not been cooling well for a while. I have noticed a leak in a suction line from the Rear AC just before it rejoins the primary suction line coming out of the accumulator.
Can anyone provide their option on my diagnosis?

You have a leak that needs to be repaired; my opinion is that is your major issue. Or, as famed AC mechanic Yogi Berra stated "Always fix first what you KNOW is bad".


Quote
Originally posted by: mk378
Looks to be seriously undercharged. You should start with a full recover, fix the leak, and recharge by weight to spec-- that's the only way to know if the problem is the charge level or something else. While the system is empty you can check the OT. I don't think that 4 oz is going to do much for a full size SUV with dual air.

Agree with every word of above.



Edited: Wed September 11, 2013 at 12:22 PM by Cussboy

knightgang on Wed September 11, 2013 3:08 PM User is offline

To fix the low side leak, I need this hose. I cannot figure out which one it is.



From the routing, it appears to come form the front evaporator. It is leaking just beyond the crimp from the metal to the flexible part of the hose. You can see the evidence of the leak at the red arrow.

I would like to be able to perform a proper and full diagnosis so that I only have to break the system once to replace everything.

One thing you guys have not touched on, is why the drastic difference between the pressures once the condenser was sprayed with water. Also, why did those pressures not reclimb. (Never mind, that was because I had the doors closed, so it was not on Max Heat Load).

I just happen to know from the Ford Powerstroke Forums that these AC Compressors on this truck are know for failure. This is the original compressor, 10 years old with 177K miles on it. We are in South Georgia, so this system gets used heavily.

Is there anyway you suggest I can get a seal on the leaking suction line so that I can get a proper charge in the system to diagnose this thing. I assume at this point that one reason it may not have pulled in Freon was the leak in the suction line. But, in my mind, the compressor still should have been able to build the pressure in the condenser back up, but it did not, thus leading me to conclude that the compressor is getting weak.

The sudden drop in the Pressure had me believing that the OT is clogging up from compressor particles. Do you guys feel that is not the case?

I am going to check the pressures on this again in a few days. I will start with static pressure and see what it builds to as the system is turned on and how quickly the pressure settle out and at what readings. That may help.

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