On later applications, GM did use belts where the underhood design did not permit such large expanses between pulley locations. What you are seeing is the belt whipping due to the torsional loads of the compressor. Go ahead and use the full tension and keep in mind that the belt will relax a bit aft...

Actually, I sold the dealership in 2019 and moved to Sunny Florida in an exclusive community. During my time at the dealership, we never patched anything and never shortcut any repairs. To suggest otherwise is defamatory as you have no evidence. On the repair side of the world, we did have strict po...

To answer another of your questions, yes, systems do have a low pressure cutout switch. The idea is that with low refrigerant pressure, there is not enough refrigerant in the system to carry around the oil and thus, it will destroy the compressor due to lack of lubrication. Think of this as a low oi...

I'm going with a stuck expansion valve.

Whenever someone disagrees with your perspective, you label it "bad advice" and use words like "hack". I, for one, don't do things like that. The OP has a few perspectives here, one which will cost a lot of cash to deal with, another very few dollars. As I clearly stated, if the ...

As a former dealer and shop owner, if you have a 12-13 year old car that is now having a low cooling output, the likelihood is that the system is a few ounces low. If you look at the connections and don't see oily residue, then it is highly likely that it is a slow leak over time as described above....

In a broad sense of the word, everyone here responding to the thread is forced to "guess" as none of the respondents have physically inspected the vehicle. Additionally, no one that I am aware has had any type of "tele-exam" with the OP. The information that is being provided is ...

Actually, that's the evaporator core, not the condenser. Your system is full of contamination. You need to remove all of the lines and fittings, flush like there is no tomorrow. On that evaporator remove the expansion device and flush the core and then clean it with a garden hose and mild detergent ...

I went back and reread your original post. I see that you see the high pressure spike to 275 psi and then the belt starts squealing. That tells me that the compressor is running, otherwise you wouldn't build that pressure. Also, keep in mind that the surface area of a modern serpentine belt is 4-5X ...

With only 10 oz of refrigerant showing 150 psi on the high side, I'd suggest the expansion valve is stuck shut or there is something totally blocking the refrigerant flow.

Something is pulling away from the low side and stacking up on the high side. Nothing is circulating.