GM Service Manual Online
For 1990-2009 cars only

Coolant Bypass Hose Replacement LH2

Removal Procedure


    Object Number: 1285939  Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling.
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
  3. Compress the clamp, and remove the heater outlet hose (3) from the thermostat housing in order to gain access to the bypass hose.

  4. Object Number: 1285940  Size: SH
  5. Compress the clamps (1, 3) and remove the bypass hose (2) from the water outlet housing and the front cover.

Installation Procedure


    Object Number: 1285940  Size: SH
  1. Compress the clamps (1, 3) and install the bypass hose (2) to the water outlet housing and the front cover.

  2. Object Number: 1285939  Size: SH
  3. Compress the clamp, and install the heater outlet hose (3) to the thermostat housing.
  4. Compress the clamp, and remove the heater outlet hose (3) from the thermostat housing in order to gain access to the bypass hose.
  5. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
  6. Fill the cooling system. Refer to Cooling System Draining and Filling.