Normally a failure of this nature requires replacement of the dash gauge cluster. Make sure the warning lights work when the key is turned on. If they do then the cluster is getting power. A dealer will typically charge around $500 for this type of repair. There are some companies that can repair your cluster for around $125 if you are willing to pull it out yourself. Module Master is one such company.

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It will likely repeat when temperatures get high again. If you do decide to go to the dealer for repairs, your local Chevrolet dealer should be a good choice, the technicians there should be trained on Saturn as well.