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Re: Reinstalling A/C
My prior post is correct There is no Orifice Tube on stock 1973-1981 trucks A/C systems unless the Evaporator core and accumulator has been replaced with a 1982-1991 setup. 1978 still used the big heavy Harrison Frigidaire A6 compressor as well.
The stock 1973-1981 AC systems use a Thermostatic Expansion Valve TXV rather than an orifice tube to control the pressure drop across the evaporator.
Just FYI the rear air evaporator units in Suburban, G vans, and Motor home chassis still used a TXV much later than 1982.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
Last edited by hatzie; 02-19-2015 at 03:38 PM.
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