Pep Boys Could have been prevented! Tujunga California

When the car arrived at the shop, Gus was there and told me that they would inspect the car and if it turned out to be Pep Boys fault, they would take care of everything. He ended telling me that the hose was cracked and would need to be replaced and that that wasn't the fault of Pep Boys. How could that not have been their fault if my car's cooling system was fine before all of this? Plus they told me they supposedly inspected my car, so wouldn't they have found that hose in the beginning and we would have prevented this? I got my car taken there to prevent this from happening in the beginning. He offered to fix the upper hose for free but told me that I would need to fix for the lower hose out of pocket, which I couldn't do since I lost $300 of wages from missing work that day and had to pay a tow truck an extra $70. Comes to find out that Pep Boys has their own towing company which would have only cost me $30. This was never even mentioned to me by Gus and that was another thing that upset me as well.