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Old 08-26-2019, 12:22 PM   #11
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That I would have to go back. I just had that shop do it as itís way to damn hot to work on a car right now here. Temp in my driveway yesterday was 116, no breeze. As long as it works at this point Iím okay with it. Donít want to be outside in this heat more than I have to. Only times to work on a car here is at 0100 or winter, and I work graves, so 0100 is out. Lol. I swear I hate the desert, but, itís better than being back in bear and having to chain up twice a week in the winter. Usually I wouldnít even put chains on, but the apartment I rented at the time was on top of a steep hill, my f150 had problems getting up it with chains on.


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Old 08-26-2019, 12:54 PM   #12
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Does the shop have A/C ? Most shops don't.

If it's really that hot out there then 40 on the low side is probably too low. The higher the ambient temp, the higher the psi readings will need to be to reach the desired charge.

You can Google "a/c pressure chart" to get an idea of what the readings should be.

I recently did my own on a nearly 20 year old vehicle, which had mostly air in the system (first time recharge). I got it down right at the freezing point. What I did was: filled until charge was good enough for the compressor to kick on, then had someone rev the engine to 2k rpm as I slowly filled it until the thermometer stopped dropping, which was at the 32 degree mark. At the same time I made sure the psi on the high side was within normal range based on ambient temp, or at least close to it. But I used a manifold gauge set for this.

zacautomotive is right though, you need to be very careful working on the system as that high side port is dangerous, if you choose to check it yourself.

If it were me I'd ask the shop for details on the work they did, which hopefully will include psi readings for both low and high and then-current ambient temperature.
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Old 08-26-2019, 02:32 PM   #13
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I really don't like the low side pressure charts for filling AC systems. I don't recommend them. I tell people fill to a good steady 30 PSI and stop. Regardless if it's 70 or 95. Example connect to the low side and take a reading on a 80 degree day, now do it again on a 95 or 100 degree day. You would be surprised how small the difference is on the low side.
High side pressure is much more accurate than low side.

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Old 08-27-2019, 04:09 AM   #14
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A most reliable way to know when to stop charging is to watch the compressor, when it quits cycling 100% at idle speed to stay on all the time then stop charging and check by revving engine higher, the clutch MUST then go off and on while at maybe 2500 rpm, stop there.
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Old 08-27-2019, 04:20 AM   #15
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Quote:
Originally Posted by dhath81 View Post
Does the shop have A/C ? Most shops don't.

If it's really that hot out there then 40 on the low side is probably too low. The higher the ambient temp, the higher the psi readings will need to be to reach the desired charge.

You can Google "a/c pressure chart" to get an idea of what the readings should be.

I recently did my own on a nearly 20 year old vehicle, which had mostly air in the system (first time recharge). I got it down right at the freezing point. What I did was: filled until charge was good enough for the compressor to kick on, then had someone rev the engine to 2k rpm as I slowly filled it until the thermometer stopped dropping, which was at the 32 degree mark. At the same time I made sure the psi on the high side was within normal range based on ambient temp, or at least close to it. But I used a manifold gauge set for this.

zacautomotive is right though, you need to be very careful working on the system as that high side port is dangerous, if you choose to check it yourself.

If it were me I'd ask the shop for details on the work they did, which hopefully will include psi readings for both low and high and then-current ambient temperature.


Out here itís pretty much a necessity in the shops to have ac or at least two big portacools. I donít think they could actually function if it was one of our hot days. Last year we had a couple 122ís.


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