GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Engine 🢒 Engine Mechanical - 6.5L 🢒 Engine Coolant Thermostat Removal

    Object Number: 64991 Size: SH
  1. Remove the air bleed valve.
  2. Remove the water outlet retaining bolts.
  3. Remove the water outlet (1).
  4. Remove the thermostats (2) with the seals (3).
  5. Remove the thermostat seals (3) from the thermostats (2).
  6. Remove the heater flow control valve.
  7. Remove the engine coolant temperature (ECT) sensor (6).

    8. Object Number: 66572 Size: SH
  8. Remove the fuel bleed valve retaining nut.
  9. Remove the fuel bleed valve.
  10. Remove the fuel bleed valve mounting bolt.
  11. Loosen the thermostat bypass hose retaining clamps .
  12. Remove the thermostat housing retaining bolts.
  13. Remove the thermostat housing.
  14. Remove the thermostat bypass hose.
  15. Remove the thermostat bypass hose retaining clamps .
  16. Remove the thermostat bypass hose fitting.
  17. Remove the gaskets.