Automotive Air Conditioning Information Forum

Please take a look at my gauge readings . Duct temperature 38-42.

My low side seems a little higher.

It was 85degrees today with 70 % humidity

https://youtu.be/J7go7-uqFMM. (at 1:11 the system changes)

Vintage air specs:

Target Pressures and Temperatures
If your system is properly charged, you should see the following metrics under steady-state operation:
Low-side pressure: 10 to 20 PSI .
High-side pressure: 160 to 270 PSI (General rule of thumb is 2 × ambient daytime temperature, plus 15 to 20%).
Center duct temperature: Should blow cold at 36°F to 46°F

In the video of your Manifold Gauge Set, it sounds to me like the engine is idling. If so, bump-up the engine speed to about 1,800 RPM, and retest the pressures. Otherwise, according to the Vintage Air specs, the system appears to be fully charged and operating normally.

RossL wrote: Sun Jul 05, 2026 6:06 pm Duct temperature 38-42.

If 38-42F, why are you complaining ???

Cusser wrote: Mon Jul 06, 2026 6:44 am

RossL wrote: Sun Jul 05, 2026 6:06 pm Duct temperature 38-42.

If 38-42F, why are you complaining ???

I just wanted to make sure the readings looked OK. I was giving the vent temp as a frame of reference

JohnHere wrote: Sun Jul 05, 2026 8:06 pm In the video of your Manifold Gauge Set, it sounds to me like the engine is idling. If so, bump-up the engine speed to about 1,800 RPM, and retest the pressures. Otherwise, according to the Vintage Air specs, the system appears to be fully charged and operating normally.

You are correct it was idling probably around 1000 RPM. I will redo the test.