Why Does Ac Only Work When Driving

Anyone know whats up. Why does my AC only get cold when I drive.

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Posted by 10 months ago.

Why does ac only work when driving. Less air flow means less cooling for the hot refrigerant gas which means you guessed. Your air conditioner may be working but not at its intended power efficiency. As a result it only cools when your car is moving as the car is then capable of pumping.

When it is converted into a liquid state it releases that heat and that process repeats over and over again. There can be two possible reasons why your AC is only blowing cold air at high speeds. To make this change of state happen the car designer puts either electric cooling fans or a fan clutch to make sure the air is pulled across.

That is much less air flow than when the car is moving at say 40 MPH. If your air conditioning system freon levels are below what is needed your car ac will not cool properly. Now unless I have it only on a low setting and driving at 45mph is the only time it BARLEY blows out cold air.

When driving at slower speeds or idling the AC blows warm air. If your air conditioning system freon levels are below what is needed your car ac will not cool properly. No air flow no change of state no or little cooling.

I have a 95 4 cylinder. Now that summer is. For the AC to work there has to be a change of state from gas to a liquid in the condenser in front of the radiator To get this change of state there has to be air flow across the condenser.

If your car AC is blowing warm air you should stop driving and find the nearest auto repair service. When your car is in motion at top speeds the condenser does not require the fan to cool the freon. The AC on my 2008 20 L turbo now only works when I am driving at speeds of at least 30 MPH.

AC only works when driving. That is not the case when the car is idle. In order for this process to happen the pressure has to be right and all the components have to work properly.

Ive tried putting it in neutral and revving the engine while waiting to move again but this does not seem to make a difference. While youre driving the compressor spins faster so the high pressure side becomes more pressured and the low pressure side loses some pressureThis means more expansion and more cooling. The AC work only when jm driving.

New comments cannot be posted and votes cannot be cast. The cooling fan in the condenser is the first thing that you should look into while finding out the reason for car air conditioner not blowing cold air when idling. Another reason why the air conditioner works only when your car is moving may be low freon levels.

The car AC is only cold when driving. AC only works when driving - YouTube. Why does AC only work when car is moving.

So more power applied to the engine means more power applied to the compressor which results in colder air. Basically the AC high pressure hose is kind of like a turbo for your AC - it supplies more pressure when youre idling and less pressure when the AC motor is being driven faster while you accelerate. Regarding this why does my car AC not work when idling.

Read rest of the answerIn this manner why does my AC only work when I drive fast. Also look behind your grille and make sure the condenser it not covered with bugs and grass. Why does my AC only work when the car is moving.

This thread is archived. When the car is a idle it is most likely not moving. This door directs incoming air through either the AC evaporator or the heater core or a blend depending on the desired temperature.

My ac hasnt worked for over a year Now. That is how the AC works. If the fan is damaged or cannot run with its full force it cannot cool down the heat coming from the Freon refrigerant through the condenser.

When it is in a gas state it is able to collect absorb and hold heat. The ac works only when the car is accelerating. Simply pop the hood and see if they come on when you turn on the AC.

It is easy enough to check to see if the fans are working or not. Determining if they are weak. At that moment the freon is receiving sufficient air.

The problem could be as small as a loose gas cap or something more serious like a leak in the hose that connects to the evaporator coil. Check to make sure your cooling fans are running while the ac is on and the compressor is engaged. A defective AC condenser fan is a possible reason why your AC only works when driving.

Normally car AC systems are built so that the higher the engine speed RPM the faster the AC compressor turns. The fan is still blowing when I am at a stoplight or in a drive-thru it just blows hot air. I brought it in to get serviced and I was told that my wires were melted and thats why it stopped working so I had them replaced and after the ac was Back to normal for 2 weeks.

One is that your condenser fans is either not working or is worn out to the point that it cant spin sufficiently fast to bring enough air through the condenser. So if your fan stops working the AC cant work at its full potentialYou can also make the AC colder by raising engine speed. Another reason why the air conditioner works only when your car is moving may be low freon levels.

The high pressure hose is designed to increase and decrease AC pressure during different driving conditions since the AC drive belt will increase in speed as the vehicle accelerates. Sounds like a lack of airflow through your condenser at idle. Win a Go Rhino bumper or a Retrax XR Pro tonneau cover from Titan Truck Equipment.

The only air moving through the condenser coil is being moved by the engine fan. As a result it only cools when your car is moving as the car is then capable of pumping the freon. AC only works when driving.

A malfunctioning vacuum-operated blend door will move in one direction when theres high vacuum idling and in the other direction at low vacuum driving which would result in exactly the situation you describe. I already replaced the blower motor resistor and the plug. It also works great at night when it is cooler out its freezing and.

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