CK5
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AC Compressor Alternative

AC compressors all perform the same function and generally work in a similar manner. Most people use either a GM or Sanden unit because they're easy to come by and there are a lot of brackets and/or adaptors to make them fit. It really depends on which engine you have (SBC or LS) your system (factory or aftermarket) where you're trying to mount it (factory or relocate) and how much you're looking to spend.
 
We live in a very hot part of the world where the temp reaches 125 on a daily basis in summer and exceeds it.. so I need something that can really cool the blazer

I have a SBC 305

I want a stock fit or with minimal modifications
 
Having been in those conditions, your one saving grace is that the air is relatively dry during that time of year, but the sun load can really make it tough. Some things you can look at is ensuring the system is properly charged, and that the evaporator and condenser are free of debris. Ensure the ductwork is all hooked up, and that your blower motor is operating at full steam. Easy upgrades can be sourcing a larger condenser (make sure you get the right type depending on the refrigerant you're running), and perhaps converting to high-flow electric fans for the radiator and condenser. You're still fighting a losing battle, though, as the system that was adequate for a pickup truck isn't going to be as effective cooling the large cabin of a Blazer.

A Vintage Air kit or similar will fit with minimal modifications and features more efficient and more modern components, and will likely cool somewhat more efficiently but at a price. Some have looked at the more complex (and pricey) method of adapting the rear cooling system of a Suburban or one of the aftermarket add-on cooling units.
 
@paratrooper307 I wouldn't say that Vintage Air had more efficient components. Now I have only had one Vintage Air system, but it had a tube and find condenser which was smaller than the factory unit. The system worked good on the summer, but not what I would call great.

But you are definitely correct about the challenge of cooling a K5. I know that doing things to insulate will help too.
I'm thinking about painting the fiberglass cap on mine something besides black. I also know that using better insulation under the carpet or mat will help block the heat from the engine, exhaust and such.

I am waiting for the time and weather conditions to install a parallel flow condenser in my '90, along with a new compressor. I plan on using Redtek 12A refrigerant as I have seen good results for others.
 

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