I really thought Carfax included mileage records along with ownership or inspection records.
I think you can request records from your state's registration department
As for symptoms, the fuel pump will just die and not restart if that goes.
The A/C problems always have the same symptoms of low refrigerent, the air gets warmer.
The cooling system problem will first show up as the truck running hotter. the whole idea there is to flush it out more frequently and you can avoid those problems.
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