Nissan Tech Line Case #45871540 - Fan not turning on initially

Hopefully Nissan can sort it out for those effected.

I have basic manual controls w/ rotary dials on my 2019 Ram 1500 pickup. I can change modes and wing the fan speed all the way up to max and the system stops, thinks about it for a bit, makes the mode changes, then ramps the blower up to max. This process can take maybe 5-10sec but it is consistent and it works every time. Even though it's the basic HVAC system, it's still entirely computer controlled.

I do agree that the HVAC system on any R52 or 53 Pathfinder is overly complicated and there are many posts of issues with it here. I can't stand the system on our 2019 Pathfinder SV, but I'm basically never in the vehicle since it's my wife's car, I'm just 100% responsible for it. LOL

It would be nice if the concern you guys are having is as simple as low system voltage (faulty battery, etc), which will cause all kinds of odd issues.

I also wonder if it's autoamp related, assuming the R53s share the same autoamp as the 52s.

I just wanted to add that I also have some variation of this problem. While I haven't seen the thing where the car says that it is blowing at full blast but isn't, what happens for me is that the HVAC, when set to auto, randomly will not start blowing warm air even long after the car is warmed up. I notice that it usually takes around four minutes for it to start blowing warm air from a cold start on a cold day, but on days when I'm experiencing the issue, I can be 10 minutes into the drive and it is still not putting out any hot air. Turning the system off and then on again instantly results in warm air blasting out from the vents as it should. I should also mention that I have noticed some other issues with the HVAC system including an AC compressor that went out and was replaced under warranty and some vent sounding like it is repeatedly opening and closing that is also resolved by turning the unit on and off again. It would be nice if someone ever gets this issue escalated to the point where a fix comes out.

Same. Not as bad as some cases here. I would say I have had to turn off my HVAC about 5 times in the past year from the fan not working and restart the system to get it back going. My guess... There is a sensor that is mechanical, corroded, or not getting the signal it needs to initiate the fan speed turning on. That could also mean either a mechanical/sensor failure or software failure. When I get into my pathfinder after it has been remote started (and the fan is blasting full heat), then start it with the button, the fan rarely will not turn on again after adjusting. I also notice the fan speed resets anytime the MODE is changed... e.g. footwells only vs front vs dashboard, almost as if the electronic actuators need to change and send a signal they are in place to redirect the air before the fan gets power again. This is the first car I have had where clearly the FAN speed motor turns off between modes. As if the airflow pressure is designed to come off, let the actuator change airflow mode, then get a check that it is in place, then send power back to the fan. If they do not connect properly or there is a relay/sensor/position check not occurring, the fan will not come back on. When it doesnt work for me I just turn the system off fully for a few seconds and retry then. But it is stupid that fan motor is attached to any other check system or sensors. Something is systematically flawed here and sadly as it is not safetly related will probably never equal a recall. But at least research and fix it Nissan... Change the part or offer a software update. I bought this truck when I felt the culture was changing with the interior quality and ZF trans but if issues like this are brushed under the rug like the CV trans failures... They will have a 1 time Nissan buyer and never again. This is my only complaint or weird issues with my Pathfinder, 2022 SV 4wd.