A/C Expansion Valve. 1969 GMC C35/C3500 Pickup. TXV Externally Equalized Expansion Valve. Expansion Valve. 1971 GMC C35/C3500 Pickup. 1972 GMC C35/C3500 Pickup. 1970 GMC C35/C3500 Pickup. IMPORTANT: To confirm that this part fits your vehicle, enter your vehicles Year, Make, Model, Trim and Engine in the Compatibility Table.