Free Car Diagnostic

Showing posts with label Car AC Diagnostic. Show all posts
Showing posts with label Car AC Diagnostic. Show all posts
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Mildew Smell in Car AC

If ac blows air that has a mildew odor, the problem could be the drain pan of AC's evaporator unit is not draining and causes mildew smell in car AC.

Mildew Smell in Car AC

Possible cause of mildew smell in the car AC

(1) AC evaporator unit is not draining.
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Car AC Not Cold Anymore

Car AC Not Cold Anymore

If the car AC is not blowing cold air anymore over time it is an indication of a slow refrigerant leak or a clogged condenser.

Possible cause why car ac is not cold anymore

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My Car AC is Blowing Hot Air

 Car AC is Blowing Hot Air

The car Ac is blowing hot air suddenly or is blowing hot air slowly over a period of time. When turning the AC switch ON usually, cold air is coming out the AC vents. But when the AC switch is turned ON instead of cold air, hot air is coming out the vents.


Possible cause why car ac is blowing hot air

Major Refrigerant Leak

If initially when turning the ac switch the ac vents is blowing cold air, then suddenly the vents are blowing hot air, it is an indication of a major refrigerant leak. The refrigerant is a liquid inside the ac system. The liquid takes away heat from the passenger compartment and purges it to outside thereby creating a cooler environment from inside the passenger compartment. When there is a major refrigerant leak somewhere in the system because of ruptured hoses, the refrigerant will evaporate and the ac system will reduce its performance. Since the refrigerant evaporates, the ac vents will be blowing hot air instead of cold air.

Open the hood of your car and check the ac line for any ruptured hoses. Replace the ruptured hose.



AC Electrical Problem
The electrical system possibly the switches or wire is shorted or the fuse of the ac unit break which causes the ac system to malfunction. Check the fuses if busted. If the fuses are busted then this is what causes the problem.

Even though the fuse is replaced, it is most likely to be busted again because the cause why the fuse is busted is not yet identified and repair. Therefore bring the car to a reputable shop and have the ac electrical system examine by a qualified mechanic.

Small Leak on the AC system
If the ac blows cold air then slowly blowing hot air over a period of time, it only means that there is a small leak somewhere on the ac system. A small leak on the system tends to drain out the refrigerant slowly over a period of time and slowly reduces the ac performance.

Bring the car to a reputable shop that specializes in car air conditioning system. Ask the mechanic to check for any leak on the system and have it repaired.

Clogged Condenser

The condenser is one of the components of the car ac system that serves as a mini radiator that removes the heat that the refrigerant absorbed on the passenger compartment. Over time the condenser will be clogged because of dirt or debris coming from the outside surroundings and it can slowly make the car AC to reduce performance which is why the car ac is blowing hot air.

 Car AC is Blowing Hot Air

Check the condenser for the buildup of dirt and clean using a soft brush and water. It should improve the performance of the ac system. If not then bring the car to a car shop that specializes in car air conditioning system. Ask the mechanic to examine the ac hoses for any leak on the system, also for the electrical system for any short circuit. Recharge the system with new refrigerant after the repair is done.

Related Topics:
Car AC Not Blowing Air From Vents

Mildew Smell in Car AC

Mildew Odor Comes Out the AC Vents

The air that comes out the air conditioning vents has mildew odor. The reason for this problem is that the drain pan is not draining.

 

1998 Blazer AC is Blowing Hot Air

 We received a lot of email query about a 1998 blazer hot air blowing air conditioning system, so instead of answering the email one by one we decided to discuss the problem.


Diagnose and Repair Car Air conditioning System

Principles of air cooling of AC system
The principle that is applied to the automotive air conditioning system is that when liquid turns into a vapor it will absorb heat so that the surrounding area cools down. It is similar to the principle that when a body is wet and the perspiration is exposed to the wind the body will feel cool.

Refrigerant flow
The illustration is shows basic structure of the air conditioning system of an automobile. The cycle is that the refrigerant changes state from liquid state to vapor state and back to the liquid state again. The liquid becomes gas when the refrigerant absorbed heat and the surrounding becomes cool, then the gas is compressed making the refrigerant temperature to rise, now as the gas cools down it will return to liquid state.

Car AC Blows Air with Mildew Odor

When the car air conditioning is turned on, the air that comes out the air-con vents is with mildew odor.


Do it yourself

Step by step do it yourself easy to understand basic car maintenance for the car owners.

How to Install a Car Battery

While engine is running, use the meter to check the alternator and voltage regulator output. This is very important because a faulty alternator or voltage regulator can cause a premature battery failure and you do not want this to happen.

How to Check Tyre Pressure

The tyre thread life could reduce if the tyre pressure of your car is under what the car manufacturer specified on your car owner’s manual.

How to Change a Flat Tire

When you encounter a flat tire while you drive your car the first thing to do is to pull off the road away the traffic as possible.

How to Recharge a Car Battery

Before attempting to recharge car battery always make sure that the battery is at room temperature (60 °F to 80°F). Also, when it is extremely cold remove the battery from the car and bring it indoors to allow the battery to become warm before begin the charging.

How to Disconnect a Car Battery

Do you know how to disconnect a car battery? Suppose you want to clean or replace the battery and needed to disconnect the battery to make the job well then here is what to do.

How to Replace Windshield Wipers

When you have a car it is important that you have knowledge with basic car maintenance like this simple step on how to replace windshield wipers.

How to Jump Start a Car Battery

Jump a starting car is easy but should be done correctly so that accident such as a battery explosion can be avoided that may result to the damage of your car or worst injured you.

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