ac only works when driving slow

No air flow no change of state no or little cooling. To maintain airflow when the car is in stop and go traffic or is completely stopped condenser fans will come on automatically.

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The fan is still blowing when I am at a stoplight or in a drive-thru it just blows hot air.

. I have had this problem with my 99 Honda Civic for several years and I cant take it anymore. Mine was 32 psi stock setup for R12. The quick way to check the POA setting is to run the AC at idle unplug the blower fan and look at the low side pressure.

As soon as you get moving it gets cold again. This can be caused from a slipping belt bad compressor clutch or even the cycling switch not allowing signal to activate the compressor. This can be a few things.

It only goes to the windshield. That I cant change the heaterac airflow direction on. -listen to hear if your radiator fans are running.

Joined Jul 17 2016. Mine is that the AC only works on cool days and when the outside temp is 75 the AC blow hot air. 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.

Now that summer is. If your car AC blows cold air when driving at highway speeds but turns warm at stop lights or when driving at slow speeds you may have a bad radiator fan or radiator fan relay. But there is a much more likely culprit.

Up to 20 cash back Ac on auto only works when you drive fast. I have taken it to a shop. It is easy to adjust but you have to waste your refrig charge when you open the system.

It may come back but only when you -. After a minute or so the low side will stabilize at the POA setting. I have a 2002 Jeep Liberty 6 cyl.

The ac needs air constantly flowing across the condenser-this is the thing in front of your radiator that looks like a radiator. Rael July 6 2008 826pm 1. Car Car AC only cold at high speeds but not low on coolant.

Driving down the road it works and gets nice and cold. If thats not the issue then your coils on your condenser is stopped up not allowing it to cool the air. Car Car AC only cold at high speeds but not low on coolant.

And noticed that the second fan on the radiator never came on although i. 4 Jul 27 2016. The AC blows hard all the time but when you are sitting at idle at a redlight or something it goes from cold to lukewarm.

My 2010 E350 AC works fine and blows cold air almost instantly when the car is parked in the shade. AC Blows Cold Air Only When Driving 30 MPH or Faster. I have heat and cooling.

When your going down the road airflow is no problem. Rael July 6 2008 826pm 1. Get a thermometer that goes in your vent to see if its hot as you think it is or not from Amazon HERE.

From what I have been told there is a valve in the AC that is not replaceable but there is a company that DOES have parts for the compressor. 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. The air conditioning compressor will turn off at the slightest rise of heat due to excessive HEAD PRESSURE - however the engine will not show any signs of overheating.

Then it kicks off for about 2 second. The AC on my 2008 20 L turbo now only works when I am driving at speeds of at least 30 MPH. As soon as you slow down the ac goes out.

VOLVO-V70 March 30 2019 128am 11. The ac works only when the car is accelerating. If your HVAC works the same as an 04 try this.

Anyway I think the fuse is a 40amp maxi-fuse. It could be a low charge of R-134a also. By the way the POA adjustment if pretty easy and makes a big difference in the AC temp.

Up to 8 cash back When the car is moving versus stopped there is more air flow over the condenser the heat exchanger in front of the radiator and that airflow is essential to system operation. Could also be a bad compressor or one on its way out. Although at some point the compressor wont engage if there isnt sufficient refrigerant in the system.

The ac works only when the car is accelerating. 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. Ian you are 8 years too late and I would hope they have fixed the problem or replaced the vehicle.

-key to ON position engine off. I would say in 90 of all cases where I tried to turn offon the AC the AC does not blow cold air. 99 of the time this problem is caused by insufficient air flow into the engine bay while vehicle is in slow moving traffic or at stop with engine and ac on.

Air condition systems only need around 6 lb of pressure to operate. Many cars are equipped with two radiator fans while others have. Ive tried putting it in neutral and revving the engine while waiting to move again but this does not seem to make a difference.

Does this indefinitely making the truck sound like its idling funny. Sounds like either youre low on freon or your condenser fans are not kicking on. -set climate to auto and temp to Lo.

You may have a fan malfunctioning. When you stop or slow down the airflow depends more on the fan which is either electric or mechanical. I popped the hood and noticed that when the AC compressor kicks on that it almost stalls the engine.

AC Blows Cold Air Only When Driving 30 MPH or Faster. But if the car is parked in an unshaded area under the hot sun the AC keeps on blowing hot air. My one issue is the AC doesnt work when the truck is idling.

But if the car is parked in an unshaded area under the hot sun the AC keeps on blowing hot air. Sounds like you may be having a similar issue as me. Up to 8 cash back 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.

When Im idling with AC on I can hear the AC compressor kicking on for under 3 seconds. The air vacuum check valve seems to be working OK. Up to 20 cash back proautotech.

You need to verify the compressor is coming on when the AC is not working.

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