this fellow in the link had exactly the same issue with his Vibe. He had two vibes, one had this same issue, his other one did not.
He has not posted since 2018 and he may not even come to Genvibe anymore, but, If i had his email address, I would ask him.
Ive done extensive searches and have come up empty except for the link below.
Since this is a Delco A/C system and not a Toyota, this may not be an issue the Matrix or Corollas had.
Any suggestions are appreciated.
In the link below, he did not reference any solution.