Originally Posted by Libby

My check engine light has been intermittently coming on for the past 3 months. Today I stopped by Advanced Auto Parts and they hooked up their scanner to my car and advised that my car was returning a P0597 code.
"Thermostat Heater Control Circuit/Open". I called Chevrolet customer service after reading the many posts from other Cruze/Sonic owners who have experienced the same issue. I was told by Chevrolet's customer service rep "Steph" that in order to determine what is wrong with my car, I need to take it to a Chevrolet dealer and pay them to diagnose the problem. I politely advised Steph that I should not have to pay my local Chevrolet dealer $165. 00 for them to attach their scanner and tell me that the Thermostat /Housing Unit needs to be replaced at XXX amount because my Cruze has 55k miles on it and is past the bumper to bumper warranty. Per Steph, the Thermostat, sensor, or housing unit are not covered under the Power train Warranty and politely advised me to "read my owner's manual to be better informed". I asked Steph why Chevrolet/GM felt the need to use defective/faulty parts and then expect the owners to pay for repairs that could have been avoided? It seens to me that a lot of Chevrolet owners are experiencing this issue, so Chevrolet /GM should see this trend as an issue they need to address at their expense, not their customers. I advised Steph that I have been a loyal Chevrolet Customer, but after this experience, I will make sure my next car will not be a Chevrolet or GM product since customer loyalty in not appreciated by Chevrolet/GM.