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Old 05-30-2002, 09:02 PM   #1
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How do you get rid of air bubbles in the coolant system

How do you get rid of trapped air bubbles. I've heard that you jack the front of the car up when adding coolant but that doesn't make sense since the thermostat is closed so I'm thinking that the car needs to be running? I'm not to confident in this method, how do I do it?
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Old 05-30-2002, 09:23 PM   #2
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Wait until your motor is cold and then remove the radiatior cap. Start the motor, after the thermosat opens you should be able to see the coolant circulating in the rad. You might lose some coolant into the overflow bottle, once the car "burps" the coolant leval in the rad will drop. Top is off with the right antifreeze/water mix. Shut it down, install the rad cap and you shold be good to go.
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Old 05-30-2002, 11:53 PM   #3
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Yep, that's how you do it. Sometimes if you squeeze the upper radiator hose a few times by hand while the coolant is circulating with the cap off, it helps to flush out the bubbles. Don't burn yourself.

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Old 05-31-2002, 02:17 AM   #4
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So basically all that tilting the engine stuff is crap?
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Old 05-31-2002, 06:27 AM   #5
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Tilting the engine up when it is warm should help too. Remeber the high spot is the upper rad hose. If you tilt the engine UP above the rad hose air bubbles will rise to the new high spot- your radiator.

I've never bothered with this as I've just squeezed the upper rad hose, but if you are having trouble, the concept is correct.
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