![background image](http://html1.mh-extra.com/html/gmc/2003-duramax/2003-duramax_owners-manual_2235698054.webp)
1. Park the vehicle on a
level surface. You can
remove the coolant
surge tank pressure
cap when the cooling
system, including
the coolant surge tank
pressure cap and
upper radiator hose, is
no longer hot.
Turn the pressure cap slowly counterclockwise
(left) until it first stops. Don’t press down while
turning the pressure cap.
If you hear a hiss, wait for that to stop. A hiss
means there is still some pressure left.
2. Then keep turning the cap, but now push down as
you turn it. Remove the pressure cap.
3. After the engine cools, open the air bleed valve on
the thermostat housing.
Fill with the proper mixture. Add coolant until you
see a steady stream of coolant coming from
the bleed valve.
4. Close the bleed valve.
5. Rinse or wipe the spilled coolant from the engine
and compartment.
5-36
Summary of Contents for 2003 DURAMAX
Page 58: ...NOTES 5 40...
Page 82: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance Record 6 24...
Page 83: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance Record 6 25...
Page 84: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance Record 6 26...