Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hi Im David, thanks for visiting the site. have the mechanic test the evaporator temp sensor.
thats the most probable cause. its located in front of the evaporator.
you have other possibilities...1) a defective thermal expansion valve (TXV). Since it takes a while for ice to form, and it will often melt after the evaporator is blocked long enough for the temperature to rise above freezing, the air conditioner seems to work intermittently.2) A failing AC compressor can cause the same symptoms (if a variable compressor gets stuck at full stroke), failed receiver dryer can cause similar symptom (desicant blocks TVX or evap core)3) if the car has had a refrigerant leak, moisture in the refrigerant can freeze inside the evaporator, causing a blockage.4) be sure condensate drain is not blocked, and make sure cabin air filter is not blocked/dirty and not plugged with leaves.5) If system is overcharged, freezing can happen.
hows it going?