Will Heater Work Without AC Compressor in Car?

Yes, the heater will state ill work without the AC compressor.

The heat is generated by the engine and not by the AC compressor, so even if you don’t have an AC compressor it’s still possible to get warm air when you turn on the heat.

This means that if your AC compressor isn’t working, you can still use your heater without it! When you turn on the heater, it uses the engine’s mechanical energy to heat up the cabin of your car.

The air that comes out of the vents will be hot, but it will not be as cold as it would be if you were using an AC compressor because there is no refrigerant in the system.

What is the function of the AC compressor?

The AC compressor is a critical part of your car’s air conditioning system. It is responsible for compressing the refrigerant gas that circulates through the system and keeps it cool.

The compressor also compresses the gas so that it can be stored in a smaller space and distributed to the evaporator coils in your vehicle’s interior.

If you have ever had a problem with your AC, you know how important this component is! If your compressor is broken or not working properly, you will not have any ability to cool down the air inside your car or cabin.

This can be extremely dangerous on hot days when temperatures outside are soaring above 90 degrees Fahrenheit Compressor and Heater Function.

How to Test the Ac and Heater Systems?

To test the ac and heater systems, you will need:

  1. A millimeter that measures voltage and current.
  2. An ohmmeter that measures resistance.
  3. A voltmeter that measures voltage.
  4. A vacuum pump or pressure gauge for testing pressures in the system.

Turn on the heat (or air conditioning) in your car. Next, turn on the engine and wait for it to reach normal operating temperature.

Then, turn off the engine and let it sit for about 10 minutes with all accessories turned off

How does it work?

The compressor is the heart of your AC system. It’s responsible for pumping refrigerant through the system, which then cools down and becomes a liquid as it travels through coils in your car’s air conditioning ductwork.

The liquid is then compressed into a gas, which is what allows it to be pumped around the system again. If you have no compressor, you won’t have any cooling at all.

But that’s not all! Without the compressor, you won’t have any ability to heat up your car either.

That’s because the compressor is also responsible for compressing refrigerant into a gas so that it can be used as an anti-freeze agent in wintertime meaning that without a working AC system your heater will not work either.

Why would you want to use it without an AC compressor?

The heater and A/C system in modern vehicles are controlled by a computer, and if it stops working due to a fault in the computer or its attached components, then you’ll need to pay another $800 or more to get it fixed.

Some people who live in hot climates might just not be able to afford that kind of repair cost while they’re trying to save up for something else, like rent or car payments.

Others may live somewhere cold enough that they don’t need their car’s heater at all it’s just too cold!

Whatever your reason for needing the heater without an AC compressor, we hope this article helped answer your question!

What are the different types of compressors?

There are two main types of compressors: reciprocating and Centrifugal compressors.

1. Reciprocating compressors

Reciprocating compressors use pistons that move back and forth to create compression, while rotary compressors use a wheel to spin a bladed wheel that moves back and forth.

Both reciprocating and rotary compressors work by moving gas through a compressor wheel. The wheel has blades on it that spin around at very high speeds.

As the blade spins, it creates a vacuum between its edge and the housing wall.

The pressure difference between the high-pressure area inside the housing and the low-pressure area outside forces air into the compressor wheel, which is then pushed out through an outlet valve into your car’s system when it reaches a certain level of pressure.

2. Centrifugal compressors

Centrifugal compressors are used in cars that have a V-shaped engine, such as a V-8 engine. They’re also used in smaller engines like those found in hybrids.

These compressors are less efficient than other types of compressors; however, they are usually quieter and cheaper to manufacture than other types of compressors.


You will not be able to use the heater in your car without a functioning AC compressor. It would be very difficult to do so because the heat from the engine would not be able to transfer through the air conditioning system.

Steven Hatman
Steven Hatman

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