Question about 2009 Ford Flex

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The air is cold as long as you are going down the road but as soon as you stop for a few minutes it blows hot air.

We added 2 cans of freon but the problem just got worse.

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  • Ford Master
  • 21,873 Answers

Did you use a gauge to measure the pressure.
Is the cooling fan for the radiator working correctly ?
It may be over-full now.

Posted on Jun 30, 2012

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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WildBill49
  • 97 Answers

SOURCE: Air Conditioning

Sounds like the hig head-pressure cut=out is kicking in and shutting down the compressor. This is probably caused by not enough air being moved across the condensor coil (in front of the radiator). Check and make sure all the engine cooling fan components are in place and functional (fan clutch, shrouding, belts tight) and also check the coil for obstructions (Bug accumulation, road debris, litter). Clean the coil and radiator as much as possible at a self-service car wash, see if that doesn't help.

This can also be caused by an overcharged system (too much Freon). Sometimes when these symptoms first appear, the knee-**** response is to add another can of Freon, only to make things worse. If this is the case, I would recommend a system evacuation and service, replacing the dryer/receiver and pulling a 28mm/hg vacuum on the system, and then refilling with the proper amount of Freon, and cleaning the evaporator coils as well. This can only legally be one by an HVAC Certified technician, to insure excess Freon is not released into the atmosphere.

Hope this helps you figure it out, and good luck!

-WB

Posted on Jun 09, 2008

vmhreha
  • 77 Answers

SOURCE: air condition/heater

sounds like the air-conditioning expansion valve is probably not working correctly here is a way you can fix your air conditioning:

  1. Realize that auto AC is basically a refrigerator in a weird layout. It's designed to move heat from one place (the inside of your car) to some other place (the outdoors). While a complete discussion of every specific model and component is well outside the scope of this article, this should give you a start on figuring out what the problem might be and either fixing it yourself or talking intelligently to someone you can pay to fix it.
  1. Become familiar with the major components to auto air conditioning:

  2. the compressor, which compresses and circulates the refrigerant in the system
  • the refrigerant, (on modern cars, usually a substance called R-134a older cars have r-12 freon which is becoming increasingly more expensive and hard to find, and also requires a license to handle) which carries the heat
  • the condenser, which changes the phase of the refrigerant and expels heat removed from the car
  • the expansion valve (or orifice tube in some vehicles), which is somewhat of a nozzle and functions to similtaneously drop the pressure of the refrigerant liquid, meter its flow, and atomize it
  • the evaporator, which transfers heat to the refrigerant from the air blown across it, cooling your car
  • the receiver/dryer, which functions as a filter for the refrigerant/oil, removing moisture and other contaminants
  1. Understand the air conditioning process: The compressor puts the refrigerant under pressure and sends it to the condensing coils. In your car, these coils are generally in front of the radiator. Compressing a gas makes it quite hot. In the condenser, this added heat and the heat the refrigerant picked up in the evaporator is expelled to the air flowing across it from outside the car. When the refrigerant is cooled to its saturation temperature, it will change phase from a gas back into a liquid (this gives off a bundle of heat known as the "latent heat of vaporization"). The liquid then passes through the expansion valve to the evaporator, the coils inside of your car, where it loses pressure that was added to it in the compressor. This causes some of the liquid to change to a low-pressure gas as it cools the remaining liquid. This two-phase mixture enters the evaporator, and the liquid portion of the refrigerant absorbs the heat from the air across the coil and evaporates. Your car's blower circulates air across the cold evaporator and into the interior. The refrigerant goes back through the cycle again and again.
  2. Check to see if all the R-134a leaks out (meaning there's nothing in the loop to carry away heat). Leaks are easy to spot but not easy to fix without pulling things apart. Most auto-supply stores carry a fluorescent dye that can be added to the system to check for leaks, and it will have instructions for use on the can. If there's a bad enough leak, the system will have no pressure in it at all. Find one of the valve-stem-looking things and CAREFULLY (eye protection recommended) poke a pen in there to try to valve off pressure, and if there IS none, that's the problem.
  3. Make sure the compressor is turning. Start the car, turn on the AC and look under the hood. The AC compressor is generally a pumplike thing off to one side with large rubber and steel hoses going to it. It will not have a filler cap on it, but will often have one or two things that look like the valve stems on a bike tire. The pulley on the front of the compressor exists as an outer pulley and an inner hub which turns when an electric clutch is engaged. If the AC is on and the blower is on, but the center of the pulley is not turning, then the compressor's clutch is not engaging. This could be a bad fuse, a wiring problem, a broken AC switch in your dash, or the system could be low on refrigerant (most systems have a low-pressure safety cutout that will disable the compressor if there isn't enough refrigerant in the system).
  4. Look for other things that can go wrong: bad switches, bad fuses, broken wires, broken fan belt (preventing the pump from turning), or seal failure inside the compressor.
  5. Feel for any cooling at all. If the system cools, but not much, it could just be low pressure, and you can top up the refrigerant. Most auto-supply stores will have a kit to refill a system, and it will come with instructions. Do not overfill! Adding more than the recommended amount of refrigerant will NOT improve performance but actually will decrease performance. In fact, the more expensive automated equipment found at nicer shops actually monitors cooling performance real-time as it adds refrigerant, and when the performance begins to decrease it removes refrigerant until the performance peaks again.

Posted on Jun 05, 2008

dsacco86
  • 1077 Answers

SOURCE: my 99 ford f-150 blows only hot air.

The A/C system has a pressure switch will keep the A/C from running if the freon is low. It prevents damage to the A/C compressor from low freon.
My bet is you'll need to recharge the A/C system.

Posted on Apr 14, 2009

  • 15 Answers

SOURCE: ford ka heater blows hot air all the time

Your problem is a faulty heater control valve. The design used on these vehicles allows for hot water to flow constantly and compete with the evaporator as there is no blender door. You have to replace the valve and possibly the control head. Meanwhile, you can bypass the valve to have cold air

Posted on Sep 12, 2009

  • 11 Answers

SOURCE: 1998 for taurus heater wont blow hot air only cold

you need to check the blend door in the heater box it maybe broken or stuck.the blend door switches between the heater core and ac evaporator to provide a mix of temperature

Posted on Oct 18, 2009

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check the freon and the compressor for leaks

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over filling it was a big mistake, so was guessing.
the freon is added by weight, from empty. not volume.
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Air conditioner stopped blowing cool air. Added freon. Worked well for a few days. Now only blows cool air on passenger side.


Chances are you have a pretty fast freon leak, and the passenger side will be blowing warm within a few days. I have the same thing happen on a couple of my GM cars, except my leak is very slow; warm driver's side, cold passenger side.

You can try and top off the freon again, but I suspect you're going to have to take it to a shop to find the leak and get it fixed. Plan on spending some big dollars for the repair.

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Aug 08, 2011 | Hyundai Sonata Cars & Trucks

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AC will blow cold air for a few minutes then start blowing hot air, cut the engine and start it again and blow cold air for a few minutes then start blowing hot air again. Just filled up the freon and the...


you have moisture in the system this causes your expancion valve to freeze up an stop working, thats why it works for sort time and when it de-freezes stars working again. you need to do a EVAC & RECHARGE with a good AC service equipment, specially attention to pull vacumm por at least 20minutes so you get all moisture out of the system.
Good luck

Jun 05, 2011 | 2002 Hyundai Santa Fe

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Air condition blows hot air but it has freon


You may have created an over charged condition and at this point the a/c compressor will cut off on high head pressures. This can be verified by installing gauges to the systems high and low side service taps and reading the pressures.An overcharged system will start the compressor briefly but soon cuts off once pressure goes to 350 - 400 lbs on the high side. Acceptable pressures for this system should be no greater than 250 high and low suction should drop to 40-50 psi.You might recover the charge and evacuate the system,then try bringing the charge back to proper level.A sight glass in the reciever drier really helps determining proper fill.Once all bubbles have dissipated from the sight glass during charging ,one should stop at that point to avoid overfilling.Too much freon is worse than a low charge especially in hot ambient conditions....

Aug 26, 2009 | 2003 Saturn ION

1 Answer

Today the A/C stopped blowing cold air yesterday it was fine, Nothing but hot air was coming our of vents


Look for leaks around the A/C hoses and compressor. You may just be low on Freon. When the pressure in your lines (amount of gas in your ac lines) is low, the ac will just cutout hence blowing hot air. try adding some freon.

Jul 06, 2009 | 1998 Ford Windstar

1 Answer

2004 Mazda6 AC blowing warm air


too much freon is the same as not enough freon

Have an 04 mazda6 as well, AC seems to be the cars weakness. It takes 15-20 minutes till my car is ina driveable condition (Phoenix, AZ)

Take it in for a tune up, but I doubt the AC will be any better

Jun 19, 2009 | 2004 Mazda 6

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Intermitten AirConditioning


Sounds like there is either

1. Too much freon in there

or

2. Not enough freon in there.

Freon (R) being freon or low CFC equivalent.

Sounds like the system is working fine, then the condensor or compressor gets too cold and freezes up (or gets WAY too hot). when you turn the A/C off, the system has time to stabilize and return to a more 'normal' condition.

Mar 04, 2009 | 1991 Ford F250

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Heat blowing Cold when in drive. When in Park, it is warm


have you chg. any thing lately like thermostate? added any coolent to system? if not, thermostate could be stuck in the open position. if stuck open, setting still, it will throw heat, but moving coolent flows to fast and does not get a chance to get hot. if you did chg. thermostate it could have a air pocket in the system. and also adding coolent can create an air pockets too. you will know this when your traveling down the road and temp guage fluctuates up and down. witch means air in system.

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