GM Service Manual Online
For 1990-2009 cars only

The proper operation of the cooling system depends on the hoses and clamps being in good condition. Yet, these items are often taken for granted and overlooked. When these oversights occur, roadside emergencies will follow which will lead to low customer satisfaction. These problems can be avoided by proper physical and visual inspection of hoses and clamps.

Hoses should not only be checked by means of a thorough visual inspection, but also by squeezing each hose along its entire length. Look for these problems:


    Object Number: 876768  Size: SH
  1. Sponginess: If the hose collapses too easily as you feel along its length, it indicates deterioration and that means the hose should be replaced.

  2. Object Number: 876770  Size: SH
  3. Bulging or swelling: If you see this on the hose, it means there has been weakening under pressure, and replacement is again indicated.

  4. Object Number: 876861  Size: SH
  5. Brittleness: If as you feel and wiggle the hose it has a feeling of brittleness, an immediate replacement is required.

  6. Object Number: 876865  Size: SH
  7. Cracking at the point of attachment: If seen during your visual inspection, immediate replacement is needed.

  8. Object Number: 876872  Size: SH
  9. Broken clamps: If seen, replace the clamp. Inspect the hose while it is off, and replace if any of the problems listed are apparent in the hose itself.

  10. Object Number: 873187  Size: SH
  11. Screw the clamps as shown in illustration: (1) 12 o'clock position, (2) 3 o'clock position, (3) 6 o'clock position, (4) 9 o'clock position