GM Cadillac 1967-1989 Repair Guide



Hoses are frequently overlooked in normal maintenance. Both upper and lower radiator hoses and all heater hoses should be checked for deterioration, leaks and loose hose clamps at every tune-up. Check the hoses by feel; they should be pliable. Any hose that feels hard or brittle should be replaced as soon as possible (replace the clamps also). In any case, replace radiator hoses as necessary every two years or 30,000 miles.


See Figures 1 and 2

  1. Drain the radiator as detailed later in this section.

When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Loosen the hose clamps at each end of the hose to be removed.
  3. Working the hose back and forth, slide it off its connection and then install a new hose if necessary.
  5. Position the hose clamps at least 1 / 4 in. (6mm) from the end of the hose and tighten them.

Old hoses have a tendency to remain stuck to the outlets after the hose clamps are loosened. If this is the case, slice the ends of the old hose with a utility knife or single-edged razor blade. Always make sure that the hose clamps are beyond the bead and placed in the center of the clamping surface before tightening them.

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Fig. Fig. 1: Removing the heater hose

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Fig. Fig. 2: Removing the radiator hose