stoic hawk
A good while back I’ve noticed my ac would cut off and cut back on when at high.now it’s gotten to a point where the system won’t turn, the screen shows what it needs to show, I hear clicks and the blend doors moving but my blower motor last night going home never turned on. But I got into the highway and for a split second there was a burst of air coming out the vents and I’d hear the ac kick on and then it would stop right after that. It did this once or twice.isn’t spinning I ordered a new one plugged it in and still isn’t spinning my next try is gonna be the resistor but if it isn’t the resistor what else could it be I checked all fuses and they’re all fine I also should mention when I take the resistor out it doesn’t get warm or anything when I change the fan speed on the display. It was working earlier today I was at a stop light and turned off the car and turned it back on and it was blowing but after I turned it off that was the last time it turned on
#2006 Nissan Armada
vocal perch
I assume when you say "a/c would cut off" you mean the blower motor. In this case, it is most certainly the resistor. Your rear a/c is blowing because there are two seperate blower motors and resistors, one for the front and one for the rear.
Other options include: grounding, wiring continuity, switches, body control module.
Here's why these other options probably don't make much sense:
Grounds and wire continuity (either by corrosion/breaks) will both cause intermittent issues (if not absolute, i.e. no functionality). If a ground is loose or a wire is half broken, it will work randomly. This issue does not seem random.
A switch issue could certainly be an issue, however, if this were to be the case; your blower would most likely not operate at all when you set it to high, as it would create an open circuit.
Now the kicker: the body control module. It could absolutely cause this issue. Most likely isn't the source, but it can cause these symptoms.
After covering every other possibility (and this was typed assuming you do not have a multimeter, if you do, just let me know and we can go over how to 100% verify the source of the issue), it is most likely the resistor.
Presumably, when you got onto the highway, you gave it a little bit more throttle than usual. This causes the alternator to put out more voltage than it would when just cruising. As soon as the alternator started to put out more voltage (due to the increased RPM's), the voltage regulator starts putting in more work to level out the output to around 14.3-14.6 volts. A resistor is a fairly inexpensive and quick fix, so definitely give it a shot