car air conditioner blowing hot air when idle

Your car AC relies heavily on the motor fans to circulate the flow of freon when the car is at rest. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air.

How Long Can I Leave The Ac On While My Engine Is Not Running Yourmechanic Advice

So check the Freon level in the first place.

. What happens is this. Debris There are several ways debris can get into your cars air conditioning system to. 7 Days a Week.

Low car AC charge causes evaporator freeze up and low airflow. 1 Year12K Mile Warranty. Thankfully in this guide we will review each of these car AC problems in detail.

If your car ac pauses the flow of air when idling but turns back on when you begin to move the first place you should turn your eyes is the motor fans. If your car AC blows cold then warm the cause can be a low system charge moisture in the system a malfunctioning expansion valve clogged evaporator fins or an overcharge condition. A common symptom of a faulty or failing set of fans is that your car will start running hotter at idle with the AC on as the condenser creates a large amount of heat.

2 Faulty Compressor Leading To AC Blowing Hot Air If your freon levels are OK the reason for your AC blowing hot air might be a faulty AC compressor. Free easy returns on millions of items. When the compressor is rotating faster the expansion valve opens more.

I show in this video what was causing the problem and how I fixed it on my 2005 Hyundai Santa Fe. If your system only has a very small leak a simple recharge might allow your AC to work fine for another year or two. 2 cause of AC blows warm at idle Your AC system is low on refrigerant.

A Blown Fuse or Electrical Issue Your cars AC system is made up of a jungle of wires switches relays and fuses. When its level goes lower than the acceptable level you will face the issue of car air conditioner not blowing cold air when idling. Other possibilities include a faulty compressor broken cooling fans or an issue in your electrical system.

Ok so I have a Chevy Trailblazer 2004 vehicle. Three dealers checked the system fluid level pressures and leak tested the system. All passed Honda spec.

However as your car sits and idles there is no airflow without the fans. Free shipping on qualified orders. The condenser sits behind the front grill of your car where debris can enter and cause blockages in.

Fully compressed freon will undergo full expansion and will fully cool down the cooling coils. Heres how to nail down the cause. My AC started blowing warm air when sitting idle.

If the expansion fails to close slightly when idling the pressure falls off at the evaporator and the AC stops cooling. If the system is low on refrigerant it will show up as AC blows warm at idle and blows colder when the engine is running at higher RPMs. No severe damage to the condenser either.

7 Days a Week. Since the AC compressor is driven by the engine it doesnt pump as much refrigerant when youre at a stop or driving slowly. Recharging Your Cars AC System When your AC refrigerant levels get low you can recharge your system to get it working properly again.

In the past the air conditioner has worked fine at idleI think dont remember since the last time I used the ac was last year. The Condenser is Malfunctioning Your condenser removes heat from the refrigerant and expels it outwards. If just one of these parts fails your AC could shut down and start blowing warm air.

The most common cause of an AC system blowing warm air is a lack of refrigerant though you may also have a problem with your condenser. The compressor can pump the Freon more easily when the car is running at a high speed on the highway but it struggles when the car sits idle. AC compressor has only 1 job.

Under normal operating conditions these pieces and parts work together to deliver power to the AC unit giving you cool air on demand. Refilling the Freon in your car ac system can be the solution for car air conditioners blowing hot air when idle. After starting up again in 5 - 10 minutes the air blows cold again.

Refrigerant thats in a liquid state makes its way to the evaporator where it boils as warm air from the cabin flows across it. To compress the freon. Ad Have Auto Mechanics Come to You.

Scotty Kilmer mechanic for the last 45 years shows how to fix a car that is blowing really hot air even though the AC system is turned on full cold. However when coming to a traffic stop or other non-moving situation warm then hot air blows out the vents. You can do the refill yourself if you know the procedure.

In most cases its due to a loss of refrigerant in the system. Ad Enjoy low prices on earths biggest selection of books electronics home apparel more. When idling the compressor is rotating slower and the expansion valve closes slightly to keep the pressure constant at the evaporator.

Ad Visit Your Local Dealer and Enjoy Exceptional Service Competitive Pricing. If there is an issue here your AC will blow warm air. If the fans arent running properly then the refrigerant will leave the condenser and cause warmer temperatures to circulate throughout your cars AC system.

I literally just checked the ac pressure about 20mins ago and the pressure is normal for the temperature outside. If the car is moving the air conditioning system will not require a secondary cooler.

Signs Of A Failing Air Conditioning Compressor