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air conditioning

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How to Replace an AC Accumulator
The accumulator in the air conditioning system is faulty if there is rattling inside of it or there is a moldy smell emitting from the AC system.
How to Diagnose a Broken Car Heater
A working car heater will keep you warm and defrost your car. A failing radiator, thermostat, or heater core can cause your heating system to fail.
How to Diagnose an Inoperative Air Conditioning System Faster and Easier
Automotive technicians diagnose an inoperative air conditioning system with a digital scanner, physical inspection, and under the hood examination.
Should I Get an EPA Technician Certification?
Automotive technician jobs often require EPA technician certification for mechanics, so you can make repairs on automotive air conditioning systems.
How to Get an EPA License as an Automotive Technician
Automotive technician jobs require an EPA certification to learn how about the environment while repairing automotive air conditioning systems.
How to Replace an AC Clutch Cycling Switch
An AC clutch cycling switch meters low side AC pressure. This switch helps the AC system maintain proper cabin and evaporator temperatures.
How to Replace an Evaporator Temperature Sensor (Switch)
The air conditioning system has an evaporator temperature sensor that fails when there is no cold air or the air conditioning is inconsistent.
How to Replace an Air Conditioning Compressor Relay
The air conditioning compressor relay supplies power to the compressor for AC function. This relay should be replaced if it's proven to be faulty.
How Does a Car Air Conditioning System Work?
Auto air conditioners serve well on hot summer days to make driving more pleasant by cooling the air and removing excess moisture in the car.
How to Get an EPA Technician Certification
The EPA (Environmental Protection Agency) technician certification program educates people who wish to repair automotive air conditioning systems.
How to Replace an AC Fan Control Module
The AC fan control module turns on the AC condenser and the radiator in some cars. The procedure to replace this module varies by make and model.
How to Replace an AC Evaporator Sensor
The air conditioning pressure evaporator sensor monitors and adapts to the evaporator's temperature, preventing damage and keeping the AC working.
How to Replace an AC Condenser
The AC condenser malfunctions if the air conditioning system has clogged passages or leaks, or if the condenser electric fans stop working.
How to Replace an AC Condenser Fan
AC condenser fans need to be replaced when the air conditioning stops running. If the AC fans don't work when the car is on, the fan relay may be bad.
How to Replace an AC Line
AC hoses are failing if the air conditioning system is not blowing cold air or the air is leaking out of the AC lines.
How to Replace an AC Control Module
AC control modules fail when the air does not distribute fully. If the temperature is inconsistent, the control unit may be at fault.
How to Replace an AC Pressure Switch
The AC pressure switch protects the AC system from pressure that's too high or low. Common signs of failure include a bad compressor or lack of AC.
How to Replace an Air Conditioner Receiver Drier
The AC receiver/drier is stores and dries refrigerant. This component should be replaced if too much water enters the system or if leaks are found.
How to Replace a Heater Blower Motor Switch or Relay
The motor switch on your heater and air conditioning goes bad when the switch gets stuck in certain positions or will not budge at all.
How to Replace an Air Conditioning Belt
Replacing an AC belt can be challenging, as you have to locate specific parts in the car in order to do so, and use proper tools to complete the task.

Related questions

Bearings in AC are making noise , 2011 Volkswagen Jetta
I am not quite clear which bearings or other components you may be hearing. The most likely noises coming from the engine compartment would be the AC compressor clutch bearing and the compressor itself. While the clutch bearing is much...
When turning the temp. selector from cold all the way to hot, does it click?
The a/c system has temperature blend door actuators that control the temperature door of the a/c heat system. The clicking is caused when the internal gears of the temperature blend door actuator cannot move the door inside the evaporator case...
Air conditioning blowing air speed is suddenly decreased - even though I am keeping the full speed it's not blowing sufficient cool air
The a/c evaporator is most likely freezing over until it restricts air blowing through it. The most common possible causes depending on the model of vehicle you have are: the cycling switch, temperature probe, expansion valve, or electronic control problems...
Nissan Pulsar 2015 heating problem
Hi and thanks for your question. It sounds like you have two different things that could be fixed. There is either a vacuum line that split open on the blend doors to the heater and a/c system, or the blend...
AC not taking coolant
Hey there. You may have a bad A/C compressor if you see the compressor engage but the high and low pressures stay the same. If the high pressure spikes above 300 or more, then the compressor can produce pressure but...
Why is there a burning smell in the car when the heat or air is on?
Hello and thank you for your question. The smell you are having is a result of a dirty cabin air filter that needs to be replaced. The filter is under the dash behind the glove box. If you continue smelling...
AC makes noise after putting on expansion valve
Hello. It sounds like your new compressor may be failing. Flushing the system is not enough when the compressor fails. When there is debris in the system, it gets stuck in the expansion valves, the condenser, and the accumulator. If...
A/C only blows occasionally and only on high
Hi there. You have more than one problem with the A/C blower and blend door controls on the vehicle. The blower motor is bad and most likely burned out the blower resistor from drawing too many amps. Have the blower...
Air conditioning clutch is not engaging unless I bypass the relay.
It does sound like an issue with the pressure switch. When the switch fails, the compressor will not come on. Bypassing it turns on the compressor, which changes the pressure and allows the system to work. I would also check...
My car shuts off whenever I turn on the AC
Hi there. It sounds like the compressor itself is failing. When it fails internally the compressor binds which can cause an extra load on the engine which will cause it to run like this. I usually install a pressure gauge...
AC is not blowing cold air - 2010 Buick Enclave
Hello and thank you for contacting YourMechanic. The noise you are hearing is the serpentine belt burning on the A/C clutch pulley from the A/C compressor being locked up. Open the hood and with a flashlight look at the A/C...
AC blows warm air, Freon was recharged.
Hi there. When the freon was recharged, was the system evacuated and a vacuum test performed to ensure there are no leaks or moisture in the system? It sounds like the AC compressor may not be engaging. A blown fuse,...
Heater not working - 2002 Chevrolet S10
Hi there. It sounds like you may have a blend door motor failure. The blend door motor moves the blend door inside the HVAC case to literally blend the air temperature out of the vents by directing the airflow accordingly...
Air conditioning pressure doesn't change when clutch is engaged.
If your expansion valve was stuck in the open position then you may not see much, if any, change in pressures. Before replacing the expansion valve I would recommend you remove the compressor inlet line and turn the compressor by...
My car turns off when the air conditioning comes on - 2013 Nissan Altima
The A/C system depends on the drive or serpentine belts driven by the motor to work. If the A/C is putting extra load on the engine, the engine will suffer and can stall. You will want to start by watching...
Air conditioning and heating not working after accident
The front right side viewed from the driver seat is where the AC compressor is located. The front left side viewed from the driver seat is where the transmission is located. If all of a sudden the AC quit working...
Air conditioning light - 2001 Honda Civic
Hi there, check the A/C relay for being stuck in the "On" position. Relay contacts degrade over time and use, and can stick together when burned. The result would be the A/C light staying on, even though you press the...
My heat and AC do not work - 2003 Volkswagen Beetle
It sounds like the blend door may be stuck. The blend door is usually controlled by a cable or an actuator. If the switch itself seems to be hard to turn, it is likely cable driven and experiencing a restriction....
When a/c was on, steam from under hood and a/c went warm on a hot day and on another day came out cool for a several minutes
The source of the steam should be the first thing repaired. It is highly probable that once the leak is repaired, the A/C system will begin to work again. There are two fluid sources under the hood that can create...
Ac compressor
Hi there. It sounds like you may have one or two concerns here. Does the AC indicator light up when you turn it on? If so, this means that the command for AC is active. If the light flashes, this...

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