Heater Performance: Notes
WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
Before performing the following tests, ENGINE COOLING SYSTEM - 1500 for the procedures to check the engine coolant level and flow, engine coolant reserve/recovery system operation, accessory drive belt condition and tension, radiator air flow and the fan drive operation. Using a scan tool, check for any Diagnostic Trouble Codes (DTCs) in the A/C-heater Module, Body Control Module (BCM), Powertrain Control Module (PCM) or Engine Control Module (ECM), depending on engine application. Repair as necessary. Refer to DIAGNOSIS AND TESTING .