Automotive Air Conditioning Information Forum

JohnHere wrote: Sat Nov 15, 2025 10:45 pm I wonder why GM would apply it to the accumulator, a part that would normally be replaced every time the system is opened for whatever reason (and the decal lost after the first replacement).

Because it's GM.

Agree that it's a dumb location.

I left the system under a light nitrogen charge as I had to leave town for few days, I will charge it when I get back home. I've got a 2000 3500 Silverado Dually crew cab which was my father's also, which I'm driving back to Phoenix this week, which will be next in line for some AC tune up. My dad bought this truck new and it has 56k miles. It has the same circle sticker (different specs) on the accumulator and the same piece of shit HT6.

I'll take some accurate temps and pressures so we can discuss.

Okay, good.

I recommend leaving the '00 Silverado Dually alone until you get the '99 Yukon A/C system running well.

Does the A/C work in the Dually?

I'm not sure. I turned it on and it appeared to be short cycling but it was pretty cold. I unplugged the compressor for my journey as I would need the defrost and didn't want to run the compressor with an unknown charge or condition. Didn't want any issues in that regard.

I did break down in Raton New Mexico. Truck died in the Subway sandwich parking lot. Would crank but wouldn't start. Luckily I brought my scanner with me. Crank position sensor. I walked to Oriely's and bought some tools and the sensor and was back in business. I called three shops and asked if they could send a mechanic to pick up the part and come by and install it and all three said no. "They didn't do that kind of thing". I said I would pay triple the rate and they declined.

Im going to pull the lower fan shroud in that 99 Yukon and change out the lower rad hose. Looks tired and original. So maybe a few days before I charge up the Yukon.