I have a 2003 Pontiac Sunfire we changed the thermostat, how do you bleed...

[steph00_re]

...the coolant system?
It is still getting hot and we are being told to bleed the system but can't find out how to do that. We are only coming up with info about a 1996 model

 

[77Impala]

I have bled two engines so far. On the thermostat or just above it you will find a bolt ( I believe Will S is correct of it being about 7mm), just turn it or even remove it and fill the radiator until it flows out of the hole. But look near or just above the thermostat for the bleeder screw/bolt etc.

 

[Jay]

The butterfly valve at the bottom of the radiator.

Turn that by hand until the water/coolant begins to drain out. If you do that when the car is cold, there shouldn't be much in the block.

You should have examined all your hoses already. If they have never been replaced, they are probably not good. 5 years is a long time on a hose.

 

[Tasha H]

There should be a bleeder screw either by the radiator or by the engine block. It is just a little screw with a hole in the top of the screw. loosen it while the car is running when you get water and not air tighten it back up.
Hope this helps

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[Will S]

Never on any vehicle bleed it when its running. Locate the bleeder, should be a 7mm bolt, loosen it with radiator cap off and radiator full and wait for the coolant to come out at a steady pace, whatever you do, dont do that when it's running.