overflow tank not draining back to radiator?

2011 KIA SORENTO
153,000 MILES • 2.4L • 4 CYL • 4WD • AUTOMATIC
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LITTLEGOOF
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  • 1 POST
my reservoir tank wont drain back to rad replaced thermostat and radiator cap didn't help had vacuum test done was told it was head gasket but there is no signs of that no white smoke no signs of oil contamination when i went to remove reservoir to check it when i lifted it up to look at then the coolant drained into rad this seemed weird I'm not sure if it is head gasket but i would like your thoughts on this. Thank you.
Aug 27, 2022 at 7:47 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Yes, if you have a very small failure it will blow exhaust bubbles into the cooling system to confirm the issue you can do a chemical check which this video can help you with, Also please remove the radiator cap and inspect the radiator upper tank where the cap connects to, it if is damaged or dirty it will not seal against the cap therefore not pulling coolant back into the system. Check the integrity of the return hose as well.

https://www.2carpros.com/articles/head-gasket-blown-test

Please run down this guide and report back. Let us know what happens and please upload pictures or videos of the problem.
Aug 27, 2022 at 11:26 AM
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