Skip the auto shop - Our mechanics make house calls

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 1000 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: Added refrigerant, but no cold air

There are many causes for the AC not to be effective: Low refrigerant is common, but not always the source. The compressor has to turn on and provide the proper circulation. The expansion valve has to create the right amount...

Q: Location of bank 2 sensor 2 f-150 ford pick-up oxygen sensor

The bank 2 sensor 2 is on your right when facing the truck from the front or drivers side. The sensor is in the exhaust after the catalyst. The bank 2 sensor 1 is just below the exhaust manifold before...

Q: I sent my 2004 Mitsubishi Outlander to a Dealership and got an estimate of over $600 to replace the key cylinder.

This can happen when the key itself gets worn out making the switch inside inoperable to that particular key. This can also happen when the inside cylinder parts begin to wear out or become inoperable for the same reason. As...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...