Article 1271 - Reduction of Heater Core Water Flow or Pressure

TSB #85 - February 9, 1968
(All 1966, 1967 and 1968 Vehicles Built Prior to December 15, 1967 and Equipped with 289 or 302 CID Engines)

Whenever heater core leakage is encountered in the subject vehicles, in addition to repairing the leak, also replace the hot water heater connection at the intake manifold with a restricted elbow (C6AZ-18599-B, Class C) to reduce water flow through the heater core; thus, diminishing the possibility of water loss from erosion or pressure problems.