Q: AC not working.

asked by on

The AC is not working. The fan does not blow cold air.

An A/C system can be divided into 3 different sub systems. These sub systems work for the most part independent from each other. The heater part of it works off of water from your engine. The refrigerant part is what makes the air cold, it is a sealed system that works similar to you home refrigerator. The last sub system is the duct and fan. This is what directs the air to the vent/floor/defroster, and actually blows the air. If the refrigerant system is low, a pressure sensor will detect this and not allow the system to come on. A technician will have the proper equipment to recharge your system and find the leak. Usually electronic leak detection equipment or ultraviolet dyes are used for this. Another common issue is actuator failure. Actuators are part of the duct system. They direct air from to the proper areas for cooling or heating. If the door that directs the hot/cold air is stuck half way or on the hot side because of actuator failure, it will blow warm/hot even if the refrigerant side is doing its job. Actuators can be difficult to get to as they are behind the dashboard usually. There are also several of them so seeking help from a technician is advised.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. AC not working.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Weak heater, is this a defect?

Having a poorly performing climate control system can be difficult. From what I've found, Nissans generally don’t have the best performing climate control when it comes to the heater. You'v stated that it can blow cold on one side and...

Q: Brake lights won't turn on

If all of the brake lights aren't working, I would suspect either a switch or wiring problem, possibly a fuse. I would have a certified mechanic, like one from YourMechanic, test for voltage at the connector and trace it back...

Q: Doors not unlocking when I use key fob

Hi. I'm going to assume they open when using the door lock switch. First of all, pressing the fob once only unlocks the driver's door. The fob must be pressed a second time within 5 seconds to unlock the rear...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...