Car Ac Blows Cold Then Hot Then Cold Again
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Commonly, when AC is turned ON, you are perchance expected to blow hot air for a while until the evaporator becomes cool enough to blow common cold air. That is normal. While you are on a long road in a cool car and suddenly realized that your AC started to blow hot air, then y'all for sure there is an underline reason for motorcar AC malfunction.
Here is a uncomplicated guide that will help you find out the underline reason. In this powerful guide, you are going to quickly larn the 11 reasons for a car air conditioner blows common cold then warms in iv minutes.
- Car Air Conditioner Blows Cold And then Warm
- 1. Wet In The AC System
- ii. Blocked Drain Pipage
- 3. Blocked Expansion Valve/Orifice Tube
- 4. Defective Compressor Clutch
- 5. Refrigerant Overcharged
- 6. Discharged Bombardment
- 7. Blown Fuse
- 8. A Corroded Relay
- 9. Faulty AC Control Switch
- x. Boring Blower Fan Speed
- 11. Bad Sensors
Car Air Conditioner Blows Cold Then Warm
An automotive ac when blows cold air for a while than warm air is chosen Intermittent cooling. A auto air conditioner starts common cold and then gets warm feels like the Ac is tricking you. At that place are several reasons why a car air conditioner blows cold then warm. Here you will find the complete reasons of a car Ac blows cold and then warm and then common cold again.
11 Reasons For Car Air Conditioner Blows Cold And then Warm
Below are the eleven complete reasons for a car air conditioner blowing cold then warm.
- Moisture In The AC Organisation
- Blocked Drain Piping
- Blocked Expansion Valve/Orifice Tube
- Lacking Compressor Clutch
- Refrigerant Overcharged
- Discharged Battery
- Diddled Fuse
- A Corroded Relay
- Faulty AC Command Switch
- Irksome Blower Fan Speed
- Bad Sensors
ane. Moisture In The AC System
You lot might get surprised to know that the most common reason the motorcar air conditioner blows cold then warm is MOISTURE. Usually, air conditioning starts absurd and and then goes warm, in most cases due to moisture freezing upward in the evaporator.
Whenever evacuating or recharging the AC system, if care is non taken, the contaminated air tin can enter the organization. This contaminated air contains vapors that start to freeze upwards well-nigh the expansion valve in the evaporator and the refrigerant circulation is stopped. Thus, warm air starts to blow. The refrigerant menses resumes when the ice melts in the evaporator.
This is an Info
The main reason, the moisture needs to be removed from the AC organisation is to prevent it from freezing up, which blocks the refrigerant flow. Because h2o has a freezing point of 32 degrees Fahrenheit, just the refrigerant freezing signal is -142 degrees Fahrenheit.
2. Blocked Drain Pipe
A drain pipage leaks out the condensed water from the automobile to the outside. A blocked evaporator drain pipe lets the evaporator dip into the condensed h2o, making it freeze up from the exterior surface.
When the evaporator is blocked with ice, It will not allow air to bypass until ice melts and common cold air returns, which results in, the car AC stops blowing common cold air after a while.
3. Blocked Expansion Valve/Orifice Tube
The cold air process starts with the expansion valve. It decreases refrigerant pressure and gets information technology cooled. Contaminated refrigerants such as metal particles, droppings, and sometimes ice build in the valve.
Thus, keeps the expansion valve or orifice tube stuck in a closed position causes a restriction of refrigerant flow. Equally a result, the car ac blows cold then warm.
4. Defective Compressor Clutch
An Air conditioning compressor clutch is used to transfer engine power to the compressor. With continuous usage, the compressor clutch is subjected to wear and tear, which forces to increase of the clutch gap. And so, overall it is hard for the clutch to maintain right pressure and compel the compressor to set on the ON and OFF cycle. Thus, the AC compressor works intermittently.
5. Refrigerant Overcharged
When the motorcar AC system is overfilled with the refrigerant, the high pressured refrigerant shuts off the car Air conditioning high-pressure switch, making the compressor deactivate.
Then, when the Air conditioning is turned ON, it blows common cold air at first, soon the common cold air turns to warm air because the high-pressure refrigerant, shuts off the automobile Air conditioning loftier-pressure switch, resulting in the machine AC sometimes works sometimes it doesn't.
6. Discharged Battery
The battery provides voltage to the compressor curl to attract the compressor clutch making information technology activated. Sometimes, a very depression battery voltage or faulty generator cannot produce plenty amount of voltage to energize the compressor whorl.
And sometimes, a high compressor's whorl resistance will not permit the clutch engage, resulting in, the motorcar air conditioner starts common cold so gets warm.
7. Blown Fuse
The fuse is the gatekeeper of your machine's electrical circuits. It kills itself when an unexpectedly high current flows in the circuit. Sometimes, a fuse is fired and the Ac shuts off, leads the car air conditioner to accident cold and so warm.
8. A Corroded Relay
A relay is an electromechanical switch used to command a high amount of current by utilizing a low corporeality of current. The relay has a curl, which when activated attracts the contact, making the connectedness of high amperage excursion. This coil gets erstwhile and its internal resistance increases.
And so, a corroded relay will cut the current if its internal resistance increases due to oestrus, which leads the automobile air conditioner to blow common cold then warm.
9. Faulty AC Control Switch
A faulty AC command switch tin be the reason for car ac blowing hot air. The automobile AC control switch turns ON and OFF the air conditioner. A bad AC control switch that will not make good contacts tin also exist the reason for the car air conditioner blows common cold then warm then cold again.
x. Slow Blower Fan Speed
Low blower speed can too cause the refrigerant to freeze upwardly in the evaporator. Considering enough amount of cooling is not removed from the evaporator. As the evaporator temperature drops too much, the AC temperature sensor sends signals to the Ac control Module to stop the Air-conditioning. Which tin can forcefulness the Ac to finish blowing cold air after a while.
This is an Info
Make certain the blower fan must run at to the lowest degree for the first ventilation to remove plenty cooling from the evaporator to protect from freezing.
11. Bad Sensors
The car electrical sensors provide important information to the AC control module to turn ON and OFF the motorcar air conditioner. Sometimes, a bad temperature sensor, a bad control module, or a sun load sensor can also lead to car AC intermittent cooling.
Source: https://www.easycarelectrics.com/car-air-conditioner-blows-cold-then-warm/
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