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Coolant reservoir tank

Tiny
RPJ
  • MEMBER
  • 2008 CHEVROLET AVEO
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 123,000 MILES
Hello, coolant overflowing from reservoir tank when A/C is on, does not happen when A/C is off.

Do I need a reservoir cap replacement? Is is the original one.

Any help is appreciated, thanks, Roosevelt.
Friday, June 1st, 2018 AT 8:28 PM

5 Replies

Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
I suspect that perhaps when the AC is turned on the cooling fan is not switching to high speed.
I would try a new "cool fan hi" relay, located in the underhood fuse block.
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Saturday, June 2nd, 2018 AT 7:45 AM
Tiny
RPJ
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  • 75 POSTS
Thanks, I replaced the reservoir cap and it seems to be helping. With the relay, the car is not overheating so would changing the relay make a difference?

Thanks for your response to my questions, Roosevelt.
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Saturday, June 2nd, 2018 AT 5:28 PM
Tiny
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  • MECHANIC
  • 1,853 POSTS
I would keep an eye on the overflow just in case it does overheat and if so or even as a precaution maybe install a new hi relay anyhow just so it does not overheat and/or if you notice that the cooling fan does not switch to the hi speed when the engine is warm and the AC is turned on.
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Saturday, June 2nd, 2018 AT 5:43 PM
Tiny
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  • MEMBER
  • 75 POSTS
Thank you for your advice, I appreciate it, Roosevelt.
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Sunday, June 3rd, 2018 AT 12:20 PM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
You are welcome and come back anytime.
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Sunday, June 3rd, 2018 AT 12:33 PM

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