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Is there any reason to do a KOKO?

Very sound advice. Unfortunately, emotion and peer pressure are more of a determining factor than economy. People prefer newer something over something that has been working. One thing though, in this day and time, new does not mean it is better or more reliable.

The way I understand is the coolant will prevent corrosion. Distilled water will need ions and will take it from the engine metal if the coolant is not there so it will corrode faster than you think. I would just get the right coolant concentration. The t-stat is up on top, you should not...

Yep. That statement is very true in a lot of things in life. Plus, the hydraulic shop enable me to go around town looking for the correct length.

In the past, when I had to replace the brake lines. I could not find the one with the correct length. IIRC, the one at the store are for the 1/2 Ton trucks and therefore, it is shorter. The mechanic that did it, told me to bring the part to a hydraulic shop nearby. They made the same exact...

Bug investation is pesky. There were posting before that even after the Biocide, the dead bug needs to be filtered out or clean somehow otherwise the bug will go to the IP.

I did not read the whole thread but where did you get the sample from? If it is at the t-drain valve then, check the fuel canister. Things can accumulate at the bottom.

Wow, that is all I can say. Figure out the source and make sure you don't make the same mistakes.

Check the motor mount, trans mount, dog bone mount?

Good idea. I did that but I did not have the creativity to use flexible heater hose. I know the regular vac hose will not fit too well.

Oh ya, you may want to clean the evaporator. You can wash it through after taking out the blower fan. Make sure the drain hole is not clogged.

I suspect the batteries are dead or loose charge. Charge it then do load (not voltage) test on both batteries one at a time.

IIRC, some people have used the orifice used in Ford truck to get better AC performance. Unfortunately, I am not sure if the thread are here or the other forum.

There should be website who specify how much refrigerant is needed. As for the low pressure switch, I am not sure if they are even ACDelco anymore. I think the brand is Four Seasons who are the makers of AC components for this truck. IMO, in TX, it is probably worth having a good AC Shop do...

As I said above, the low pressure switch on the dryer is easy to replace and it is relatively cheap. No need to evacuate the system to replace. I had to replace a couple of those over the years and it always fixed that erratic cycling issue in mine. Yours may be different, I am just relaying my...

Did you LOAD test (not voltage) test the batteries one at a time?

On this compressor, a lot of times the low pressure switch attached to the dryer is weak or bad. The good news is, you can replace it without evacuating refrigerant. Try replacing this part first since it is only less than $20 a few years ago. Yes, the R-134 needs to be in the correct range of...

It is a revival of an old thread so it is a bit confusing because the new poster problem is not exactly like the original poster.

I found Sanden bracket on Ebay. Never used it, though. https://www.ebay.com/itm/185449122557?hash=item2b2da10afd:g:ruwAAOSwXjFZ3jmU https://www.ebay.com/itm/191979231898?epid=805875876&hash=item2cb2da9a9a:g:CBYAAOSwmuVab6Dq

If it runs good and does not have any code, then leave it alone. IMO.