Hi,You are right in that heater core by itself certainly isn't going to make a clicking noise.Can you provide your VIN so that I can verify if you have a particular component in your heater system that is known for this issue? The component in question, when it develops the clicking noise, will result in a lack of heat at times and certainly sounds like this may be the case here.Thanks
One more question - so I think I'm understanding that it's the heater valve control motor that needs replacing, not the heater core? Is this correct?
OK, thank you!
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What I'm going to do is share all this info with my son and then determine where to go next for mechanical help. I am not feeling like the service department at the dealership paid close enough attention to my explanation about the clicking. They just replaced the thermostat and charge me for it with no results. Then they went to the heater core as the next step claiming it is blocked, but if I am understanding your explanation correctly replacing the heater core would not solve the issue. The problem lies in the heater valve control motor, correct?