Nissan Repair Questions? Ask a Mechanic for Answers ASAP
What year and model is your nissan?
Do you know the model? Pathfinder, altima, sentra, tundra...?
The xterra has been known to have expansion valve problems. What normally happens is they get stuck in one position. The AC then blows cold constantly until the evaporator freezes up and then air can no longer flow through it. This explains why it not only stops blowing cold, but it also stops blowing very hard. If you had mentioned that it just gets warm then I would recommend checking compressor function, freon levels, etc, but if the actual flow of air decreases then it's almost certain that the evaporator is freezing. The only thing to cause that is a bad expansion valve.
It is a major job since replacement requires removal of the dash.
If you turn the AC to heat for about 5 minutes (when it is no longer blowing cold) and then back to AC will it blow cold again for a few minutes?
Please let me know if you need additional information.
Has anyone taken a look at the AC air intake sensor circuit? If the air intake sensor is faulty it could be telling the AC control unit that the air coming into the evaporator and the evaporator is too hot and then it keeps the AC compressor on for longer than it should causing the evaporator to freeze. It's not terribly common to go bad, but it's all that is left that could be malfunctioning and cause a system freeze up like you are describing.
Here is a description of the sensor from nissan.
We might be talking about the same part as I can't find a separate listing for the thermistor and the intake sensor is technically a thermistor. It lists as .3 hours or labor, so about $45 in labor, the part doesn't list a price in my catalog so it is likely only available from the dealer.
Right behind the glove box.
No, just the trim panel by the glove box. This is much more simple.
I would have imagined that the mechanic would have checked that part first. That's why I asked if the AC will work again after turning to heat for about 5 minutes back on the 25th. If I had known that it would then I would have suggested checking this sensor.
I have to say that I was leaning toward stuck expansion valve as well, but only on the assumption that the ambient temp reading had been checked by the shop. They should have pulled it up on a scan tool to see if the temp reading was stuck.
Please don't forget to rate.
Let me know if you need additional information.