Car Shakes When Heater Is On? 7 Best Reasons!

Are you curious to know why the car shakes when heater is on? There are some possible reasons for it, including; damaged air compressor, loads on the engine, loose hoses, and many more, that you’ll learn as you further delved into this article.

\When you switch on the air conditioner on a sunny day, your car vibrates. Although your automobile shaking when the air conditioner is turned on may appear to be a minor issue, it is not one to be overlooked. 

car shakes when heater is on

Whenever your car rattles when the air conditioner is turned on, it’s a warning that maybe something requires fixing. Most people believe this is likely a problem with their air conditioner compressors, but there might be numerous factors at play, which we shall address in this post. My friends, there are more things that you should know, so without further ado, let’s start!


Why Car Shakes When The Heater Is On?

Sometimes, it happens that your car starts shaking as you turn on your heater. No doubt, it’s just a minor issue. But you must understand why this happened. Stop worrying; below, we have discussed why a car shakes when heater is on.


#1. Defective AC compressor 

How can an AC compressor cause the car to shake? This has happened because; the engine is put under pressure by a defective AC compressor, which might cause it to vibrate. Your air conditioner compressor will not work correctly if it is broken. Before being transported to the condenser, the compressor cools the coolant. As a result, if your air conditioner compressor malfunctions, this could place pressure on your car engine and cause your car to shake whenever you stop and turn on the air conditioner.

Heavy drag can be caused by an idle engine for an extended amount of time. Vibrations while the engine is idling cause stalling. So much engine stalling and steering wheel shaking may occur in a car with power steering when there’s too much drag when the A/C is on. Accelerate the car while the air conditioner is on to determine the problem. If you experience a change in pick, it’s time to fix your air conditioner. Here are the 6 signs AC compressor is faulty


#2. Load on the engine

When switching on the car air conditioner, the car engine activates components, including the air control motor and idle speed. Forced induction (compressor) systems place additional pressure on engines due to the high-tech insulation and might shake whenever the load exceeds a particular range. Many parts of the engine may degrade over time if the load continues to rise. Other issues to consider include a broken cooling fan or an obstruction in the air conditioning system. In this condition, get your automobile to a repair right away.


#3. Defective fuel injector

Your car’s fuel injector is a critical component of the engine. Their task is to squirt and control the flow of gasoline, using automated valves that may close and open numerous times a second! Whenever your car’s air conditioner is turned on, a defective fuel injector can place an additional load on your engine, causing it to shake.


#4. Obsolete spark plugs

The spark plug creates a burst from a mixture of air and gasoline, producing electricity for your engine. If your car vibrates when you turn on the air conditioner, it could be due to defective or obsolete spark plugs. There is undoubtedly a problem with your car’s spark plugs if they are failing to produce the engine ignition’s power or speed, particularly during the beginning of electricity production. They should be changed.


#5. Fail engine mounting

The problem might be in the engine mounts if you’ve noticed odd engine vibrations or shaking whenever your air conditioner is operating. These can place pressure on it if they’re damaged, worn out, or misaligned, causing it to tremble when the air conditioner is switched on. The mounts are subjected to pressure when the air conditioner is turned on. Vibrations and rattles occur when the motor mountings or foundations wear down when the AC is turned on. The shaking will become much worse if the motor mounting fails.


#6. Loose hoses 

In some circumstances, a slack or disconnected hose may be to blame for the engine’s vibrations. The air conditioning system in your automobile is disrupted whenever the hose becomes loose or detached. When the car needs to operate incredibly hard due to weather changes, tremors and shaking are likely to occur.


#7. Contaminated throttle body 

The throttle body maintains the air-flow system in your car’s engine. The throttle body becomes clogged quickly; because it is an air-passing component that prevents automotive engines from receiving sufficient airflow. As a consequence, your car rattles when you switch on the air conditioning because it can’t get enough air.


It’s A Wrap!

We hope that reading this article is just fun for you, and after reading it, you get a better understanding of why a car shakes when heater is on. Remember that the defective Ac compressor is one of the most common reasons for this issue; by fixing it, you can get rid of this issue. Thank you, friends, for being with us at the end!

You may want to read related articles; know why does my car heater not work and what causes car heater to blow cold air.

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