Not sure how they went through their diagnosis honestly, but I would hope they did all the basic stuff first. I still don't comprehend that there's no HVAC diagnostic procedure on their GDS system; honestly it's the only reason I brought it to a Hyundai dealer, in the hopes that they would put it on their GDS and pinpoint the exact fault of the no heat situation. (There is a self-diagnostic HVAC flow chart I tried early on from the online shop manual, but it didn't work at all). I know I didn't pull the power supply off of the aux pump and test it, but the "aux pump" relay and "water pump" fuse tested fine, and honestly I am not even 100% sure if the relay and fuse was for the inverter pump or aux pump based on Hyundai's part descriptions. Either way, they kept the brand new inverter pump in and the aux pump is on order so hopefully it will be fixed soon enough. I just don't want to go through all this and find out that it's not the pump next week and we need further diagnostics.Someone at Hyundai sure wrote a bad troubleshooting flow chart for the "no cabin heat in EV mode" problem. Changing the inverter pump because the flow chart tells them to is crazy, I guess they try and make the techs "parts changers" and not diagnosticians.
I still wonder if they back probed the white wire on the aux pump to see if the 12v was present as well as continuity checking the pump ground wire? If the ground is good and you have 12v on the input to the pump and it's not pumping, then that would be a sure sign to change it out.
Sure glad you got this covered under warranty, btw - did they leave in the new inverter pump for you or put yours back in ?
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