1979 GMC P3500 w/o AC;. 1980 GMC P3500 w/o AC;. 1981 GMC P3500 w/o AC;. 1982 GMC P3500 w/o AC;. 1983 GMC P3500 w/o AC;. Part Type: HVAC Heater Core. 1984 GMC P3500 w/o AC;. 1985 GMC P3500 w/o AC;.
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