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I feel pretty stupid about this and also it"s probably since I yes, really don"t understand much about a Crew Cab due to the fact that I have an extended Cab.First, I have actually no label under the hood about the A/C capacities. The prior was supposedly rebuilt due to a crash before I bought it.Everywhere that ns go claims the A/C capacity is 40 oz. For a "Standard" Cab and also 48 oz. Because that a "Crew" Cab. I have yet come see any kind of specs for prolonged Cab. For now, I"m going to assume the specs space 40 oz. For my prolonged cab.I have actually a 1993 Silverado prolonged Cab w/5.7L that has currently been convert to R134a. I"m replacing and flushing virtually everything other than for the evaporator. Deserve to anyone provide me part advice on this and also why the crew cab would have 8oz more? many thanks all! This is my very first post.
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A bigger interior room to cool. The evaporator core is probably a little larger. Girlfriend should have actually at the very least 48 oz on hand however it must only be filled by a push gauge. The 40 oz would certainly be the max allowed, doesn"t median you need to have the amount in the system particularly your act a retrofit. Is the 40 oz number uncovered is because that R12 or R134a? It may take 40 oz or less relying on the ambient waiting temperature. The important component is gaining the ideal amount and form of refrigerant oil.Is your question for the 1993 Silverado? If that is the evaporator core may blow because R134a system works on greater pressures than R12.
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YOU will require a ac pressure gauge collection . Using the HI/LOW pressure gauges , you include until the pressures complement the push chart that the waiting temp the device is operating at. An interpretation the outside air temp.being a R12 mechanism this mechanism is no going to occupational at also with R134 however will work. As you include R134 you monitor the pressures and also watching the high side for a rise in pressure to 325 PSI
1200 RPM........... Currently its fee up.at 85deg f about 280 psi hello side.with R12 the pressure would be 275 PSI since of it being a totally different Freon type refrigerant i m sorry does operate
lower pressures. For this reason R134 will require slightly less because of the press being much more with this refrigerant.you need to use counter oil no PAG oil.... Counter oil is compatible with the mineral oil used with R12 this is why just conversion oil !!!!!!!!!!!typical GM solution use 8.5 OZ the oil . Great luck.the can be ~ 12OZ execute not have 12 OZ so gain a little extra. Also some loss on charging.

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Thanks guys!I have the gauge, vacuum pump, flush kit. This was currently converted come R134a before I gained it and have been driving it for around 5 years. The compressor to be making noise (probably simply the clutch) however I"m instead of the compressor, condenser, accumulator, orifice tube and schrader valve on the high side (since I think it is leaking some). I didn"t know around the evaporator main point risk. Ns hope ns don"t need to replace the thing. I really need a new entire dash therefore if that happens, I"ll probably go every the method and have actually the truck down for a main or so. Well, we"ll uncover out if I flushed it great enough together I put PAG 150 in it right before I check out your post. An excellent advice on city hall the high side no to exceed 325.. I never hear much talk around the high side. And yeah, approximately here it has been 100 degrees for the previous week, so I"ll be looking in ~ the greater pressures. J cat, execute you ever flush through brake cleaner or lacquer thinner? I used the consistent Autozone flush chemicals (Interdynamics A/C agree solvent), but was tempted to usage brake cleaner to do the washing up the evaporator first. Following job is my car which is a Ford and also I might pick your mind when I get the number in, but if ns recall, the high side was low and also the low side was much greater than when I fee it last summer. I couldn"t uncover much info around a short high next reading. But that"s another day and I"m pretty certain that isn"t walk to happen until ours temps get listed below the 90"s. It"s no fun to work-related in the garage in ~ 100 degrees.