My 2011 Crv Air Conditioning Gets Hot and Then It Gets Cold Again Back and Forth
Car AC blows cold then blows warm
Car Ac blows cold then warm
If your automobile Ac blows common cold then warm, the cause can be a depression system charge, moisture in the system, a malfunctioning expansion valve, clogged evaporator fins or an overcharge condition. Here'due south how to boom down the crusade.
Low car Air-conditioning charge causes evaporator freeze up and depression airflow
A low system charge tin can cause the evaporator coil to then common cold that it freezes the condensation on the evaporator fins. The water ice builds upward until it blocks airflow. Then the AC system shuts off the compressor and you go warm boiling air.
Evaporator gyre
You would think it would exist just the contrary; that a low charge would cause it to never get cold enough to freeze. To empathise why that'south incorrect, y'all first have to empathize how refrigerant works.
As the liquid refrigerant is metered into the evaporator (the cooling ringlet inside the rider compartment), the liquid refrigerant picks up heat from the cabin air flowing across the coil. That heat causes the refrigerant to boil and change from a liquid to a gas. All the refrigerant needs is just enough heat to cause that "modify in state" from liquid to gas. Removing that corporeality of heat from the motel of your automobile is what causes your car to feel cool.
The proper refrigerant accuse will cause the evaporator to remain slightly above the freezing temperature and produce an air temp around forty°F
Once the refrigerant has inverse states to a gas, it should selection up a maximum of ten°F more heat and then flow out of the evaporator into either the compressor or accumulator to complete the cycle.
Merely when a organisation is depression on accuse, the gaseous refrigerant stays in the evaporator longer and removes even more heat from the cabin air passing over the scroll. The refrigerant leaving the evaporator is superheated by more than 10°F. The additional heat the refrigerant removed from the cabin air causes the evaporator temperature to fall below freezing. Humidity in the cabin air freezes on the evaporator. Over time, the wet builds to the point where ice blocks the flow of air beyond the evaporator. That shuts off the AC and y'all no longer get cooling.
Clogged cabin air filter can also cause evaporator freeze up
Just like the state of affairs with low refrigerant charge, low airflow caused by a clogged cabin air filter causes the refrigerant to remove likewise much heat, causing evaporator to freeze.
Cabin air filter catch all the droppings from fresh air, similar leaves, dust, and pollen
If your car has a motel air filter and you lot think you might have an evaporator freeze up problem, start by checking the condition of your motel air filter.
Moisture in the AC organization can as well cause an Ac blows cold and then warm condition
Whatever time yous lose refrigerant from your car'south Air conditioning arrangement, that leak allows air and wet to enter. If you simply add more than refrigerant every year without fixing the leak, you build up too much internal moisture.
The wet can freeze into ice crystals correct at the orifice tube or expansion valve, bottleneck it and stopping the flow. The symptom appears as: blows common cold, and so warm. If you shut off turn on the heat for a while, that'll cook the water ice crystals and the system volition start cooling once again. But information technology will yet freeze upward.
How to tell whether your Air-conditioning has low charge or moisture?
When an evaporator freezes due to low accuse, you'll also have decreased airflow because the water ice is blocking the air. If you shut off the vehicle and leave it for a half hour or and so, you'll come across a huge puddle of h2o under the vehicle. That's the sign of a low charge. All the ice has melted and drained out the condensation tube onto the footing.
If the AC blows common cold then warm status was caused by moisture in the organization, you won't notice a decrease in airflow and y'all won't see a puddle of water after shutting off the vehicle.
Another crusade of Air conditioning blows cold then warm
An overcharged automobile AC organisation can start out pumping cold air. But that cold air turns warm fairly soon afterward because the high side pressures build to the point that the loftier pressure switch shuts off the compressor clutch. Once pressures equalize, the high pressure switch allows the compressor to offset upward again. The wheel repeats over and over, providing a brusk menses of cold air, followed by warm air. The prepare? Evacuate and recharge the car Air conditioning system.
Yet another cause of AC blows cold then warm
If your car AC blows cold air when driving at highway speeds but turns warm at stop lights or when driving at slow speeds, you lot may have a bad radiator fan or radiator fan relay. Many cars are equipped with two radiator fans, while others have one fan that can run at different speeds. In cars with dual fans, ane fan is designed to run at full speed any time the Ac is on. If that fan isn't working properly, it can't cool the condenser plenty to remove plenty oestrus from the gaseous refrigerant to get it to condense dorsum into a liquid. That also causes high pressures that can close off the compressor. The fix? Check the radiator fans to brand sure at least one fan turns one when the AC is switched on.
However, some cars operate both fans at depression speed while driving and switch into high speed fashion when the Air-conditioning is running. So get tricked into thinking your fans are ok only considering they're running. They must run at high speed in order to depict enough air across the condenser to brand the system cool properly.
Most mutual reasons machine Air conditioning won't cool
©, 2017 Rick Muscoplat
Posted on by Rick MuscoplatSource: https://ricksfreeautorepairadvice.com/car-ac-blows-cold-blows-warm/
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