# reservoir bubbling need some help

**URL:** <https://forums.speedlife.net/t/reservoir-bubbling-need-some-help/226777>\
**Category:** SON240sx Automotive\
**Created:** [October 25, 2012, 1:04pm UTC](https://forums.speedlife.net/t/reservoir-bubbling-need-some-help/226777 "2012-10-25T13:04:25Z")\
**Posts on this page:** 3\
**Page:** 2

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**Author:** ![Born2drift](https://avatars.discourse-cdn.com/v4/letter/b/35a633/32.png) [@Born2drift](https://forums.speedlife.net/u/Born2drift)\
**Post date:** [January 1, 2013, 6:12pm UTC](https://forums.speedlife.net/t/reservoir-bubbling-need-some-help/226777/21 "2013-01-01T18:12:38Z")

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hey before you jump to a headgasket try a leak down test. its a little more involved then a compression test. it’ll pin point with out a doubt if you have a leaking head gasket

1. rotate your first cyl to top dead center of the compression stroke (intake and exhaust valves closed)
2. reomove the spark plug  
3.appy pressurized compressed air to the cyl
3. remove your rad cap and look for bubbling
4. If none found continue the process for the other 3 cyl

the leak down can also help ID compression issues ( i know that not the issue with ur car)

1. Air hissing from the tail pipe= poor/bad exhaust valves
2. Air hissing from the Intake = poor/bad intake valves
3. Air hissing from the dipstick = bad compression rings or a pison issue
4. Bubbling coolent = bad head gasket/ warped head / streched head bolts…etc.etc etc etc

i hope this helps

Cheers

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**Author:** ![Singh](https://avatars.discourse-cdn.com/v4/letter/s/43a26b/32.png) [@Singh](https://forums.speedlife.net/u/Singh)\
**Post date:** [January 1, 2013, 6:25pm UTC](https://forums.speedlife.net/t/reservoir-bubbling-need-some-help/226777/22 "2013-01-01T18:25:03Z")

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Was a broken overflow tank. In a hard to see spot. Solved.

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**Author:** ![paul240](https://avatars.discourse-cdn.com/v4/letter/p/8baadc/32.png) [@paul240](https://forums.speedlife.net/u/paul240)\
**Post date:** [January 1, 2013, 10:13pm UTC](https://forums.speedlife.net/t/reservoir-bubbling-need-some-help/226777/23 "2013-01-01T22:13:08Z")

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Yes ,problem solved had to replace the overflow

Thanks for the input

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