Question about 2004 Ford F250

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Air conditioner compressor clutch not dropping out, clutch engaged all the time? Drives cabin freezing up.

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Wow, sen me this truck man, lol. that compressor putting out. ok fun an joke aside. the termostat and the ac pressure switch is gone, replace and system will work normal

Posted on Nov 13, 2009

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Air condiditioner compressor replaced


If you replaced the compressor unit, normally R-12 or what ever is used, is evacuated and thus they create a vacuum, then recharge the system to the proper level of gas/ pressure. Vehicles have a vacuum controlled shut-off valve to stop or reduce the flow of anti freeze from the engine to the heater core, near the condenser. There is sometimes a pressure control valve or switch to control, when the actual compressor unit clutch engages to start to pump the gas to cool the cabin area of the vehicle.
There are also fuses/ circuit breakers near the left front fender well under the hood, and left driver's side under left side of dash. I am presuming that the clutch assembly on the compressor functions properly engaging/ disengaging, when system is properly "charged."

Apr 23, 2014 | 1999 Mercury Mystique

1 Answer

My air conditioner is blowing warm air on the driver side and cold on the passenger side


see this steps and think with clearly and logically NOT feared. God bless you
checkmark.gif Start with the compressor. Does it engage when you turn on the A/C?
If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. Replace the motor that controls the blend air door (this is a difficult job and best left to a professional since it involves tearing apart the HVAC unit -- about an 8 to 10 hour job!).
If the compressor does not engage when you turn on the A/C, see if it will run by jumping the compressor clutch wire directly to the battery (use a fused jumper wire). If the compressor works when you jump it, and the A/C blows cold air, the system contains refrigerant and the fault is likely a bad A/C compressor clutch relay or a bad clutch cycling switch or pressure switch.
If the compressor does not engage when you jump it, the problem is a bad compressor clutch.
If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor.
If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged.

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Jul 24, 2012 | 2007 GMC Sierra Classic

1 Answer

2003 Pontiac GT1 3.4


Not exactly.
The compressor can run until it begins to freeze up depending on the system, or until pressure readings get too high or too low.
Most cars today are designed to run the compressor as long as the switch is engaged and just add hot air from the heater to adjust cabin temp. There is a sensor in the evap to prevent the system from freezing up.
As long as it is warm outside and the system is not freezing up then yes the compressor will run constantly.

Jul 04, 2012 | Cars & Trucks

1 Answer

Problem with heating and air conditioning. The driver's side is blowing hot air and the passenger side is blowing cold air


Air Conditioner blows warm air
  1. Air conditioner system is discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
  2. Air conditioner compressor clutch not engaging. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

Jun 01, 2011 | 2004 Buick Century

1 Answer

Rear air conditioning will not come through the upper ceiling vents only through the lower (heat) vent


  1. Air conditioner system is discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
  2. Air conditioner compressor clutch not engaging. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

May 13, 2011 | 1998 Ford Windstar

1 Answer

Air conditioning works but will not deflect to blow at the driver, just goes through the defroster


  1. Air conditioner system is discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
  2. Air conditioner compressor clutch not engaging. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

May 11, 2011 | 2004 Jeep Grand Cherokee

1 Answer

My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

Good luck

May 07, 2010 | 1999 Ford Expedition

1 Answer

If i start the car and then start air conditioner the rpm is not automatic increase but decrease what i do?


the rpm will first drop because of the compressor clutch engaging. it should normally drop and then return to normal idle once the computer compensates for the compressor kicking on.

Jul 08, 2009 | 1996 Honda Civic

2 Answers

No cold air for a.c.


Well Bruno it sounds like you lost freon from your a/c system.The cabin filter wont restrict you from getting cold air.Check that your a/c clutch engages when you turn it on.if it dont you need freon and have to check for leaks

May 23, 2009 | 1999 Jeep Grand Cherokee

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