Quote:
Originally Posted by DieselSJ
It is big, but those tube/fin units just aren't efficient enough.
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For a regular cab pickup they're many times overkill even using R134a.
Suburbans, Crew Cabs, and Blazers may be another story.
HFC152 & Hydrocarbon refrigerants will work very very well using the old tube and fin condenser with much lower head pressures than the R134a. I've used both.
If you have to replace the condenser then installing a parallel flow unit is just fine.
Whatever replacement refrigerant you run you can't just charge it by weight the first time. I've posted the JungleEddy method to charge with your favorite without overcharging the system. If you use a scale to weigh how much it takes to properly fill the system you can write the charge weight down to make subsequent re-charges easier.
I tend to lean toward Ester oil for retrofit refrigerant charges because, unlike PAG, it'll put up with any mineral oil you can't get flushed out of the system.