Cooling system

1997 CHEVROLET LUMINA
3,400 MILES • 3.1L • 6 CYL • FWD • AUTOMATIC
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TREESA GALVAN
  • MEMBER
  • 1 POST
I need to know how to bleed cooling system.
Sep 25, 2017 at 5:57 PM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
Normally you only need to bleed these when you are doing a flush or drain the entire system. If that is the case here, there are air bleeders on top of the thermostat housing and over the water pump. With an empty system you open the bleeders about two or three turns, then start filling the system. As coolant reaches the bleeders you close them and keep filling the system.
Be careful as the bleeder valves are very soft brass and easy to damage.

Sep 26, 2017 at 3:06 AM
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