Good afternoon.
You require Dex-Cool coolant.
Coolant type See note
When adding coolant, it is important that you use GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL coolant.
I would return to Pepboys and go to the service manager and have them remove and flush the system completely of all coolant and add the correct type and amount of coolant.
Roy
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Tuesday, November 10th, 2020 AT 10:23 AM