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Same presure on low and high ports in on and off

chopperjoe61 on Mon July 13, 2015 12:45 PM User is offlineView users profile

Year: 2007
Make: Ford
Model: F150
Engine Size: 5.4
Refrigerant Type: 134a
Ambient Temp: 95
Pressure Low: 125
Pressure High: 125
Country of Origin: United States

I have what others are telling me as a strange problem. Checked my gauges on on 5 other properly working systems to make sure that they are working correctly and they are. I'm working on an 07 ford f150 5.4 V8. My gauges are reading 125 on both the high a low sides in the off position and the ac on max position. The clutch is engaged and the compressor is working. The system has no leaks and the condenser is clean. The air is blowing correctly through the center vents, but all I get is warm air (around 80). The only thing that I have opened up was the orifice tube and it was clean and the oil was as clean as new. I vacuumed the system for around 45 minutes and recharged. The clutch kicked in around one pound of 134a and the system holds 2.3something lbs. Any ideas on what I am missing?

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Joe Elerson

chopperjoe61 on Mon July 13, 2015 1:01 PM User is offlineView users profile

I did top off the refrigerant to the 2.4 lbs and still not getting any cold air. Takes forever to add. Wondering if it may be the accumulator?


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Joe Elerson

chopperjoe61 on Mon July 13, 2015 2:31 PM User is offlineView users profile

Crickets................................that's what I'm thinking too. All my buds tell me that the compressor can't be working, but it is! Weird as crap

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Joe Elerson

HECAT on Mon July 13, 2015 9:39 PM User is offline

broken shaft? Forgot to put the OT back in?

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SlickRidez on Mon July 13, 2015 10:24 PM User is offline

Defective/missing "O" ring seal on the OT? If that's OK it seems like the compressor isn't making any pressure meaning bad compressor?

chopperjoe61 on Tue July 14, 2015 1:09 AM User is offlineView users profile



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Joe Elerson

Jag987 on Tue July 14, 2015 2:17 AM User is offline

I replaced a compressor on a 2010 F250 last week. The clutch appeared to be engaging, but it was not really engaging. The rubber holding the inner plate to the shaft had broken when the compressor locked up. It still looked like it was in the right place, and it was spinning, but it was not turning the shaft/compressor. Might be the same thing here. Make sure the very center bolt on the clutch is spinning. Also, look for melted rubber on the frame!

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I bought a can of 134a at w**-mart that had a stop leak, oil, and dye in it. It also had a hose and a gauge, so now I'm an AC pro!

chopperjoe61 on Tue July 14, 2015 8:28 AM User is offlineView users profile

HECAT and SlickRidez I'm kinda thinking that it's the compressor as well. Maybe the valves or broken shaft and Jag987 I'll check that bolt and see if the compressor is locked up as soon as I'm up and around this morning. I haven't taken the belt off but I did spin the compressor and clutch pulley yesterday I believe...I'll recheck. Pretty sure that I put the OT back in correctly and since it's doing the same thing as it was before I checked it I've pretty much ruled that out. Probably going to just order a compressor, OT and an accumulator this week. I've never had an AC go bad in such a short time in my 54 years before...just kinda blows my mind that a truck with only 60,000 miles on it and rarely driven would work perfect one minute and get back in and caput. I'll let ya know how it goes when I get the parts in and thanks for all the help, big time!!!!!


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Joe Elerson

Edited: Tue July 14, 2015 at 8:29 AM by chopperjoe61

chopperjoe61 on Tue July 14, 2015 10:07 AM User is offlineView users profile

Jag987 I was so eager to see if it was the bolt that I rushed out there and checked it. At first glance it appeared to not be moving, so I put a phillips screwdriver in the center of it and sure enough it is spinning as normal, but I still wanted to make sure so I scribed it with a marker and checked it with a timing light...still spinning. I'm at a freakin loss. The only thing out of the ordinary that I have found on the truck while inspecting it was a chewed up ground wire on the firewall behind the battery, which I replaced. Not even sure what it was grounding since it was bundled up in a ton of wires that included the wires to the AC clutch. Didn't seem to help anything anyway and the wire wasn't broken completely into anyway. May go ahead and replace the parts that I mentioned anyway and see what happens. I just know that it's something easy that I'm missing. Pissed off and mad about it


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Joe Elerson

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