99 Grand Am bleeding air out of coolant lines

VEERY3422

MEMBER
1999 PONTIAC GRAND AM
6 CYL
2WD
AUTOMATIC
167 MILES

How do I bleed air out of coolant on 99 Pontiac grand am. I keep opening the bleeder valve, and let air out but it works but then the air seems to never ne all out. Bein honest I left the car runnin after changing the thermostat thinkin that would bleed the air out then see the valve cant get all air out been tryin for like 30 min. Help me please

2 Replies

PROTECH1980

MEMBER
901 POSTS

Have you been having an over heating issue before t stat replacement?

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Wednesday, March 16th, 2011 AT 1:06 AM

CARADIODOC

MECHANIC
33,873 POSTS

What led you replace the thermostat? If it was due to overheating, you might have a leaking head gasket. That would explain why you keep getting air from the bleeder. There is a tool I call a "leak sniffer" to check for a head gasket leak. It's a glass cylinder with two chambers partially filled with dark blue liquid. Air is drawn through it from the radiator. The liquid will turn bright yellow if combustion gases are present. That test doesn't always work well on GM engines because of the remote-mounted reservoir with the pressure cap not on the radiator.