Automotive Air Conditioning Information Forum

At 18-22 PSI on the low side, and 23 PSI now, you'd be running the evaporator at about 19-25°F, promoting evaporator freeze-up and blocking airflow, unless you have some kind of mechanism to cycle the compressor.

In this instance, possible causes include the system developed a leak, undercharging ...

Is the evaporator icing-up and blocking airflow after running the system for a while? Evaporator icing could explain the cold-to-warm-to-cold cycling.

At a 30°F vent temperature (too cold) coupled with the low, low-side pressure, the system appears to be undercharged.

Given your truck's mileage—and presuming the compressor assembly is the original—I would replace it anyway. Many compressors don't last beyond 100,000 miles. There are some exceptions.

By replacing the compressor assembly, you will eliminate the clutch-gap question as well because it will come with ...

If it's annual seasonal losses from the compressor shaft seal, you might be able to get away with just a recovery, evacuation, and recharge. I would still replace the accumulator (it has desiccant in it, a moisture absorbing substance), and OT.

Pay particular attention to the condition to the OT ...

Kenny, It sounds to me like the refrigerant leaked out--maybe not all of it, but enough that the system is now below the pressure threshold to where the compressor won't engage anymore. Either that, or the clutch gap is too wide.

The way I see it, given this truck's age, you have three options ...

I’m wanting to install a New Universal condenser which I purchased about 4 yrs ago know this day would come. I will be working on mounting it tomorrow and had a question about orientation of High-Low fittings, Which is up High or Low?
I believe it’s HP down by looking at the old unit, wraps under ...

... . I was helping at a youth camp, so please don't take my delayed response as a sign of ingratitude. ... . Not at all. Life happens :!:


I was following had a high level diagnostic process using that window and when I follow that, it says I have properly charged the system (Window is clear ...

As mentioned in another topic, a company called Cold Hose in Ocala, Florida, could probably custom-fabricate it.

A few questions: Did you achieve a vacuum of 29.9 inHg or thereabouts depending on your elevation? The higher the elevation, the lower the achievable vacuum level.

Is your vacuum pump in good condition (fresh vacuum-pump oil of the correct type, all connections air-tight)?

Are you charging the ...

What is the year, make, and model of your vehicle? And what's wrong with the old line?

The photo of the old line connector is called a peanut fitting . The photo of the new line connector is called "who knows?"

I've never seen a flared fitting with an o-ring, such as that one, used on any vehicle ...