GnatGoSplat Posted April 14, 2003 Report Share Posted April 14, 2003 I meant when the car is not running and coolant is cool! Quote Link to comment Share on other sites More sharing options...
JS91Z34 Posted April 15, 2003 Report Share Posted April 15, 2003 I know. The coolant can be 40 degrees and still boil. The vacuum will cause the water to boil if enough vacuum is applied, trust me!. Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted April 15, 2003 Report Share Posted April 15, 2003 Do it with the radiator cap open. That should take care of the vacuum. Quote Link to comment Share on other sites More sharing options...
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