2010, A/C problems

withku

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Hey all, A/C issues again.

My compressor doesn’t seem to engage when ambient temp is above ~105 F°, was told to check for an overcharged system. Hooked up my gauge kit, and static pressure is ~100 psi LP side, and ~110 psi HP at 95° ambient temp and 22% humidity. With compressor engaged LP side was 140 psi and HP was 150, which is obviously wack but was still blowing cold air?

Maintenance manual claims 60-80 psi static is the sweet spot but that was too low at this temp. Sounds like a stuck open expansion valve, however these vehicles have an A/C transducer which can cause a myriad of symptoms if faulty.

ForScan read my A/C pressure at 350 psi, which is way off. Service manual says this is a bad transducer. I haven’t gotten any codes, so other than throwing a transducer at it what can I do? Thanks in advance!
 

Ecoboost_xsport

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Have you added, or had refrigerant added recently? If so, how many ounces? Using psi isn't always very accurate, you need to have the specific amount of refrigerant in the system, and the only true way to know that is to evacuate it until empty, then fill from scratch. Shops have a machine that does all this automatically. When I recently did t for my truck, I think it only costed me like $75 or so, so it wasn't mucb.
 

withku

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Have you added, or had refrigerant added recently? If so, how many ounces? Using psi isn't always very accurate, you need to have the specific amount of refrigerant in the system, and the only true way to know that is to evacuate it until empty, then fill from scratch. Shops have a machine that does all this automatically. When I recently did t for my truck, I think it only costed me like $75 or so, so it wasn't mucb.

I actually figured out it’s the transducer. Wack psi was due to stuck valve on my gauge kit.
 

Airborne

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It might be over charged, but something else might be going on. Yeah, guages are not always 100% accurate and techs have quality stuff and verify accuracy on a regular basis. You say you have a manual? Ford? The Ford manual should give step by step procedure to properly diagnose. I reccomend more diagnosis before throwing parts and labor at it.
 

Airborne

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I actually figured out it’s the transducer. Wack psi was due to stuck valve on my gauge kit.
Sweet! I had that happen before with my guages. Actually, twice. Once it was the valve and once it was the low side connector. I think the more they get used the less it happens.

Luckily i have an AC tech who lives accross the street, he said here, use my guages. Bingo.
 
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withku

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Sweet! I had that happen before with my guages. Actually, twice. Once it was the valve and once it was the low side connector. I think the more they get used the less it happens.

Luckily i have an AC tech who lives accross the street, he said here, use my guages. Bingo.

Ah that’s lucky. I rarely have A/C problems so I got a junk kit off amazon.
 

jman1200

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I actually figured out it’s the transducer. Wack psi was due to stuck valve on my gauge kit.
Mind sharing the link/PN... mine has been acting weird this Summer, sometimes it cools in the most delicious way and some other times blah... no pattern, no nothing.
 

withku

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Mind sharing the link/PN... mine has been acting weird this Summer, sometimes it cools in the most delicious way and some other times blah... no pattern, no nothing.

I ordered it off amazon, Ford doesn’t have any in stock and it’s 1/3 price.

I would recommend testing the switch first however, it’s extremely easy with ForScan or a multimeter.

Part 6F93-19D594-AA

 
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