If there is no warning light will a code still come up when scanned? I think it’s my thermostat but not sure. Car overheated 2x in 7 days but not always I’ll sit and it’s fine for a couple of days overheat light is all that comes up only at the time

Hello, yes, some diagnostic trouble codes do not illuminate warning lights. However, some problems will not set diagnostic trouble codes. As a result, it makes it hard to know what is going on fully without the combination of code retrieval and other hands on testing. A thermostat may stick, a cooling fan may not turn on, among many possible causes of your concern. Testing is needed. www.repairpal.com/repair-shops