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bleeding the radiator

1391 Views 2 Replies 3 Participants Last post by  wedge
yup as the topic says whats the best way to bleed the radiator? this is for my friends car mainly he getting some cooling issues were guessing that he has some air bubbles that make his cooling crappy at times or his fan switch sucks.

ok my fast idea on bleeding is to run the engine (cold) with the radiator cap off and keep filling it back up till it stays full.

his way is to use the beeder, and reasoning being "thats why it's there .... it's called a bleeder!"
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· Registered
172 Posts
no.. the bleeder is there to take out the coolent went removing the radiator or hose... how else would you get most of the coolent out of the rad?.... your way is the way i go may spill more then you put in, but you'll know there is no air in the system since all the bubbles would be eliminated.

· My Dixie Wrecked
590 Posts
There is no need (nor is there any easy way) to ever bleed the cooling system. The brake fluid, clutch fluid, power steering, etc, are all completely sealed, so if air gets in, it can't get out, hence the need to bleed these systems periodically. Unlike those systems however, the cooling system is NOT air tight. If you look at the rad cap, you should notice a small rubber tube exiting right beside it, follow it, and it goes to the overflow tank, and exiting the overflow tank, is another small tube which doesn't go anywhere, it just points down. This serves the double purpose of allowing the cooling system to maintain a constant pressure even when extremely hot, and it allows any air in the coolant to escape naturally. Because hot air rises, and the tube exits from the top of the radiator, any air in the system will be forced out long before it can cause any harm.
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