1979 GMC C3500 w/o A/C;. Part Type: HVAC Heater Core. 1980 GMC C3500 w/o A/C;. 1981 GMC C3500 w/o A/C;. 1982 GMC C3500 w/o A/C;. 1983 GMC C3500 w/o A/C;. 1984 GMC C3500 w/o A/C;. 1985 GMC C3500 w/o A/C;.
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