What To Do If Honda Civic Ac Blows Cold Then Hot?

On a hot summer day, nothing beats cranking up the air conditioning in your car. Few things feel better than a breath of fresh air! But what if your honda civic ac blows cold then hot?

One of your vehicle’s most complicated systems is the air conditioning. There could be various reasons why it is blowing heated air. A few of the more frequent ones will be explained.

Causes For Faulty Air Conditioning System

When the cabin temperature rises to dangerous levels, driving your Honda Civic in hot weather with a faulty air conditioning system is not only uncomfortable but also dangerous to your health. We’ll go through a few of the reasons why your Civic’s air conditioner is only blowing hot air in this article.

1. There Is A Leak In The Air Conditioning System

The most typical cause of a car’s A/C progressively losing its cool is a little refrigerant leak. Moisture and refrigerant combine to form a corrosive acid that eats away at seals, valves, and hoses in the A/C system, causing a leak. Because there isn’t enough refrigerant in the system to cool things down, a leak in your A/C system could cause the machine to emit warm air.

Even worse, the acid can corrode the inside of your compressor, causing damage, obstruction, and component failure by dispersing metal shards throughout your A/C system.

2. Compressor Broken

The compressor is the core of your car’s air conditioning system. It’s in charge of moving the refrigerant around the system. If this part fails, the antifreeze will not be able to reach the condenser and cool it.

Compressor problems are more likely to occur during extended periods of inactivity, such as during long winters when A/C isn’t required. To avoid this, many newer vehicles keep the condenser running all year by activating it under the defrost setting.

3. A Broken Fuse Or An Electrical Problem

The A/C system in your car is a maze of cables, switches, relays, and fuses. These sections and parts function together under normal operating conditions to give power to the A/C unit, providing you with cool air on demand.

If even one of these components fails, your air conditioner may shut down and begin spewing warm air. While this is beneficial in preventing dangerous electrical fires, it also means that a single-blown fuse could cause your entire air conditioning system to shut down.

4. Leak Of Refrigerant

A refrigerant leak is frequently the cause of a car air conditioner spewing hot air. The refrigerant in your car’s air conditioning system expands and contracts as it eliminates heat and humidity from the cabin. Without proper refrigerant levels, none of the other A/C components will work properly.

An aged hose, as well as a rusty or perforated evaporator, might produce a leak. A refrigerant leak, on the other hand, will be difficult to detect. A pool of liquid in or under your automobile is unlikely to be noticed. Antifreeze, unlike motor oil and other important vehicle fluids, evaporates when exposed to the air. Occasionally, you’ll get lucky and find an oily residue near the source of the leak.

One of our skilled experts must inject dye into the system to definitively identify a refrigerant leak. They will fix and recharge your automobile A/C once they have identified the source of the leak, allowing it to blow fresh, cold air once more.

What To Do If Honda Civic Ac Blows Cold Then Hot?

When the cabin temperature rises to dangerous levels, driving your Honda Civic in hot weather with a faulty air conditioning system is not only uncomfortable but also dangerous to your health. Here are a few options for resolving the issue.

1. Remove The Condenser And Clean It

If your Civic’s condenser is dusty, the simplest option is to clean it. To get to the condenser, you’ll usually have to take off the front bumper. You can clean the condenser using a pressure washer, but make sure it’s set to low pressure because high pressure can damage the delicate fins.

2. Ensure That The Evaporator Is Clean

Civic’s evaporator is a difficult task to clean. In most situations, the entire dashboard must be removed before the evaporator can be accessed. As a result, it is suggested that this be done in a workshop.

3. Replacing The Defective Component

A malfunctioning blend door actuator cannot be repaired and must be replaced. It is not suggested as a DIY project due to the difficulty of the replacement job. After replacement, the blend door actuator may need to be recalibrated.

Frequently Asked Questions:

Here are some frequently asked questions about honda civic ac blows cold then hot:

1. Why Is My Car’s Air Conditioning Blowing Cold Air First, Then Hot Air?

This is known as a “flooded” evaporator, and it is a problem that results in warm air. The flow rate of the refrigerant can equalize while the system tries to modulate the expansion valve or cycle the compressor, which is when you might feel the air temperature start to reduce again.

2. Why Does My Car’s Air Conditioning Cycle In And Out?

The components of your vehicle’s air conditioning system frequently freeze, resulting in intermittent cooling. The most common cause is an iced-over evaporator. Because an evaporator covered in ice cannot cool the air, you must wait for the ice to melt, which is why the cold air returns.

3. What Does It Cost To Replace An Air Conditioning Compressor In A Car?

According to Repairpal.com, automotive a/c compressor replacement costs approximately $994, with average prices ranging from $842 for a compressor to $1146 for a compressor in the United States in 2020.

4. Is It Worthwhile To Replace An Air Conditioner Compressor?

Replacement is an option worth considering for most air conditioning components. However, a malfunctioning compressor begs the question of whether your entire system should be replaced at the same time.


There are a variety of reasons why your honda civic ac blows cold then hot. When trying to figure out why something isn’t working, start with the most obvious cause: a lack of refrigerant.

In any case, it is recommended that laypeople attend a workshop. A competent mechanic can quickly determine the problem with your air conditioner’s cooling system.

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