Automotive Air Conditioning Information Forum

JohnHere asked what the ambient was when you first got the hi side of 250


Yeah "the temperatures were about 78-80 with less than 20% humidity."

So, I sprayed heavy duty degreaser on the parts that I could see from the front and rinsed it off. After I believe it had ample time to dry out, the ...

Tim wrote: Tue May 17, 2022 2:06 pm
220 psi, not sure why an issue is being raised about high pressure.

That's my question!

Thanks

Check your fan clutch. They typically 'wear out' in 3-4 years.

I have a continuously variable fan clutch. Do they wear out in 3-4 years or just electric fans?


If it just looks dirty overall with obvious crud between the fins, a careful spraying with a heavy-duty detergent and rinsing with ...

So, I did additional testing:

Air temp: 79 Humidity <20%
at idle: 36 on low side, 225 on high side, temps about 40 and greater
at 1800RPM: 30 on low side, 220 on high side, temp about 38 and greater
Misting at 1800 RPM: 30 on low side, 160 on high side, temps 38 and greater
There was considerable ...

How many miles on the truck? 190,000
Has anyone ever "topped off" the refrigerant? Not in the last 9 years
If so, was any sealer added? Any history of leaks?
Avoid sealer at all costs.

Has the compressor or any other component ever been changed out on this 20 yr old truck? If so, why? No
Get ...

What is the year, make, and model of your truck?

2002 Chevy Silverado 2500 Duramax


When you changed the LP switch, did it have a Schrader valve behind it or did you have to evacuate and recharge the system as well?

Yes, there was a Schrader valve so I did not have to recharge the system ...

Cusser wrote: Mon May 16, 2022 7:36 pm Was the air flow out the vents decreased?

No it wasn't decreased.

At the end of a 2600 mile trip with the A/C working fine for the trip, it seemed that it wasn't working well the last few miles. It could have just been that we got back into the cold weather and it wasn't needed. In any case, I figured it was the low pressure switch that had gone again since it was ...