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Overflow tank not draining back to radiator?

Tiny
LITTLEGOOF
  • MEMBER
  • 2011 KIA SORENTO
  • 2.4L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 153,000 MILES
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.
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Saturday, August 27th, 2022 AT 7:47 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
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.
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Saturday, August 27th, 2022 AT 11:26 AM

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