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air conditioning

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P2517 OBD-II Trouble Code: A/C Refrigerant Press Sensor B Circuit Low
P2517 code means the A/C refrigerant pressure sensor is out of the normal refrigerant level range, a faulty switch, wiring, or connectors.
P2613 OBD-II Trouble Code: A/C Refrigerant Distribution Valve Control Circuit High
P2613 means a problem with the A/C refrigerant distribution valve control circuit which causes the air conditioning to not work properly.
P0539 OBD-II Trouble Code: A/C Evaporator Temperature Sensor Circuit Intermittent
P0539 means the A/C evaporator temperature sensor has a too high/low voltage signal, usually caused by a faulty evaporator temperature sensor.
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 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 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 Clean Evaporator Drain Tubes
The air conditioning system on a car has evaporator drain tubes than need cleaning if there is dirty air in the car or it is not blowing consistently.
How to Replace a Car Air Conditioning (AC) Compressor
If the AC compressor fails, it can cause the air conditioning system not to work. This article covers how to locate, remove, and install a compressor.
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.
How to Replace a Car Air Conditioning (AC) Low Pressure Hose
Car air conditioning (AC) low pressure hoses carry refrigerant back into the compressor to keep providing cold air in a closed loop system.

Related questions

Question
Clicking noise in the rear when a/c is on.
The clicking noise coming from the rear a/c unit in the right rear of your vehicle is most likely the temperature blend door actuator has internal circuit problem. You should have a mechanic like one from YourMechanic come and check...
Question
AC clutch making squealing noise
Of course, make sure the oil and refrigerant charge are correct. Too much of either will create an excessive load on the compressor. Also, check the operating pressures to see if they are within an acceptable range. Check belt alignment...
Question
Blower motor stop working!
The blower motor relay is a unit that supplies power to this motor when you turn the switch to "on" and can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the...
Question
Air conditioner blows colder at idle and heater blows slightly warm.
Hi there. A blend door could be stuck and causing the outside air to enter the cabin compartment. Check the blend doors to see if they are sealing shut. If they are not sealing shut, then check the actuator and...
Question
Screeching serpentine belt when the a/c is on. Is this a problem with the serpentine belt?
Hi there. There is a problem with the alternator or a/c compressor clutch pulley. Check the pulleys out on each item and see which one is creating a heavy load or a skipping feeling as if the bearing is seizing...
Question
My car vibrate when I switch on the AC/ I changed e mount plus e spark plug but still vibrate a lot. Please help
Hello. There are several components that will lead to the vehicle vibrating when the A/C is on. With the motor mounts and spark plugs eliminated from the list, you should check into the operation of the air conditioning. The first...
Question
Air con isnt getting cold
Hello. You likely need to [pressurize the refrigerant]https://www.yourmechanic.com/services/heating-ac-inspection) in the system properly. Unfortunately there is no way to test the system without hooking up gauges and physically testing it. If you have recently filled the system, there may be a...
Question
Noises from the ac 2004 Saturn Vue
Hi there - if the compressor is making rattling or clanking noises this indicates an upcoming failure of the compressor. Yes, it will eventually seize or otherwise fail, possibly breaking the belt when it does. When the compressor fails, bits...
Question
Can you just replace the clutch on the AC compressor or do you have to replace the whole thing?
Yes you can just replace the clutch pulley on the a/c compressor. The issue that you may have is the pulley bearing seized up and may have spun on the front of the compressor nose cone and will damage it....
Question
My ac slowly stopped working after just two days.
The air conditioning system relies on a full system charge to function properly. A poorly operating air conditioning system is usually caused by a low charge from a leak. If the air conditioning compressor electronic clutch fails, the fuse blows...
Question
Where is the AC pressure switch located?
The air conditioning system on your vehicle uses a pressure transducer (switch) that is mounted in the lines, near the condenser. The receiver/drier is actually incorporated into the condenser/power steering combination cooler. Please also take note that if you plan...
Question
I have an exhaust smell in my car and I need to figure out why and where it is coming from?
Hi there. First check the blend doors to the heater / air conditioning system. If you are smelling ambient air smells in the cab, then the blend doors may be opening to the outside air. For the exhaust leak, check...
Question
A/C is going crazy. The reading of the "outside temperature" resets itself. 2004 Land Cruiser
Hello - most likely, the outside air temp sensor has been damaged or ripped out. (They are often mounted down low just behind the front bumper, which makes them vulnerable to all sorts of things.) When the sensor is removed,...
Question
AC manifold gauges show no pressure on high or low side.
The a/c system would need to be pressure tested to check to see if the condenser got damaged and leaked all the refrigerant out or a component like the compressor front seal failed. Have a mechanic like one from YourMechanic...
Question
When I turn on my A/C it smells like transmission fluid
The first thing to check is to see if you have any kind of engine or transmission fluid leaks that the air conditioner could be drawing in the smell of the oils into the A/C air intake. If you have...
Question
Smoke from engine and checked with nearby line lube express in petrol station. They said it's a problem with AC compressor bearing.
Hi there. The seal on the compressor to the air conditioning system has a leak and caused the oil and refrigerant to leak out of the compressor. The bearings on the compressor shaft are lubricated with the oil in the...
Question
AC is not cold
A ten year old car is very likely to have lost some of its refrigerant charge. Even if the system has no detectable leaks, Tiny amounts of refrigerant can leak past the seals and over time you will lose enough...
Question
My AC is only blowing through the defrost vent and rear defrost doesn't work.
Hi there. The blend doors on your vehicle are operated by a vacuum hose. Check the vacuum lines to the engine and see if any of them are broken, has a hole, or is disconnected. Check the vacuum hose on...
Question
My car alerted me by saying a/c off due to high engine temperature.
Hi there. Check the coolant temperature and see if the engine is overheating. If the engine is overheating, then you want to check the upper radiator hose and see if the temperature is different or the same as the bottom...
Question
How much A/C refrigerant does a 2007 Lexus GS350 takes
The system hold 1.0 lbs of refrigerant for the air conditioner. Remember if you lost oil out of leak then the system oil total is 4.5 oz. You may need to add a couple oz of oil also. The system...

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