Question about Ford F-150

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I turn on ac but the clutch solenoid does not engage

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  • paulgrippele Jul 24, 2009

    emisionwiz was very helpful

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The usual cause of this is the system is low on refrigerant, if so you have leaks and will need to address that before adding any refrigerant, to test the ac compressor clutch you will need to jumper the low pressure switch in the receiver drier, that is the round can attached to the larger of the two ac lines, the switch is in that can, take the connector out of the switch and put a paper clip in it that jumps the two diff wires together, with the ac switch set to on the compressor should run, at this point u have confirmed the low charge situation. please get back to me with the results of this test of compressor clutch. u can call me at home if u like 925-459-0571

Posted on Jul 24, 2009

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1 Answer

How to fix ac clutch that always engaging


Hi Mark
Thats an easy one...
It gets told to engage by a single wire attached to the clutch.
This usually has a bullet type connector close by.
12v = ON
Disconnect it. Solenoid disengages.
(you could put a switch in the line)

This wire is controlled by the AC (control electronics) temperature sensor & the pressure build up in the refrigerant lines.
Eg The unit turns on to cool vehicle but the refrigerant is low or the high pressure line is too high so it shuts off. Then the cycle starts all over again.
You need some Service on your AC system.

Cheers

Dec 02, 2015 | 1995 Mitsubishi Lancer

1 Answer

No electrical power to AC Compressor. The switch light comes on in car when AC power button is turned on.


  1. Check if air blows with the fan setting turned to high.
  2. Check that the radiator cooling fan engages when the A/C button is pressed.
  3. Locate the compressor.
  4. Turn on the A/C.
  5. Check if the compressor's clutch has been engaged.
  6. If the clutch engages, the fault is elsewhere.
  7. If the clutch does not engage, check for power to the clutch.
These steps might help find the problem.

Sep 16, 2013 | 1997 Ford Escort

1 Answer

My a/c compressor is only blowing hot air when I turn it on. I know a little about cars so I know it's the a/c but I am not able to find one on any site that may sell used or new.


If all you get is hot air there are several possibilities. The compressor is driven by the serpentine belt and is engaged and disengaged by an electric clutch mounted on the compressor drive pulley. With the engine running, have an assistant turn on the AC while you observe the AC compressor clutch. If the clutch engages, you can be reasonably sure that the system has freon, and the electric circuit is OK. If the clutch doesn't engage, which is the most likely situation, either you are low on freon, the AC clutch relay is inop, or AC compressor fuse is open (blown). A search of Google images will give you the location of the AC relay. You can pull out the relay, carefully remove the cover, reinsert the relay, and engage the compressor clutch by manually closing the relay contacts. Warning: do this only for a second or two in order to see the clutch engage. If the clutch does engage, then you are probably low on freon. There is a safety switch that prevents the clutch from operating if there is not enough freon in the system. Hopefully, this is the case. Go to Walmart and get two cans of r-134 and the inexpensive kit, and following their instructions, charge your system. If this is not the problem, you'll need a set of AC gauges and the skill to use them. Hope this helps. Dano

Aug 31, 2011 | 1998 Lexus Gs 400

1 Answer

Air condisioner compressor will not engage


Possible that the AC switch is faulty or the SOLENOID CLUTCH is not working thereby not activating the pulley to turn the compressor.
If so it can be failure of the solenoid.

Jul 09, 2011 | 1994 Saturn Sl

1 Answer

Ac will blow warm air, the clutch does not engage. Could this be a compressor prob? Looked in the manual ...no trouble shooting ideas


Since you know that the clutch must engage in order for the compressor to operate, then there are most likely one of causes. The first is low or no freon in the system. The a/c system has a pressure sensor mounted in the low( return) side hose that prevents the clutch to engage if the freon is too low. The second would be the a/c fuse or relay faulty, preventing the clutch solenoid( a 12 volt electrically operated solenoid) from engaging. And the third would be that the clutch itself is bad because the solenoid wiring has broken. I suggest that first you locate the a/c clutch relay in the relay panel, remove the relay, carefully remove the plastic cover from the relay and reinstall the relay. The clutch should engage the compressor when you manually close the relay contact with your finger for one or two seconds. If the clutch does engage, your electrical circuit in ok and you are probably low on freon. A half of a can of r-134 in more that enough to operate the pressure switch. If it doesn't engage, check the a/c fuse or the clutch solenoid itself. Get back to me and let me know how things went. Dano

Jun 30, 2011 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

Airconditioning system blowing hot


Find the AC compressor. The pulley on it has an electric clutch that allows the compressor to run when the AC is on and not when it is off. With the engine running you should be able to see if the clutch is turning or not. The pulley turns all the time the engine is running only the clutch behind the pulley starts and stops. Look at the pulley with the AC off. Have someone turn it on and see if the clutch engages to turn the compressor. If it doesn't engage there are a couple thing that could be wrong. First the clutch has burned out and no longer works. The fuse on the AC clutch is blown. Check the fuse. More likely, if the cold air has been getting warmer, the AC system has a refrigerant leak. The system has a low pressure switch that prevents the clutch from engaging when the refrigerant pressure is too low. If the fuse is good then you need to have a qualified AC Technician check the system.

Thanks for using FixYa.
Gaker

Jun 29, 2011 | Chevrolet Chevy Cars & Trucks

1 Answer

AC blowinghot air


Locate wires coming from compressor clutch and trace to nearest plug that you can unplug. Turn on A/C to max cooling. If clutch not engaged (center of compressor drive pulley not spinning with pulley), unplug compressor clutch wires and use multimeter to check voltage going to compressor clutch. If voltage is around 12 volts or more, then clutch should be engaged when plugged in. Plug clutch wires back in (with motor still running and ac set to max). If clutch still not engaged, then clutch definitely bad because 12V signal should engage it.

May 08, 2010 | 2002 Lincoln LS

3 Answers

My honda 92 engine stops running when i engage the AC


is your AC pump turning? if not that couild kill an engine...theere is also a switch-usually on the pump- that controls engine speed when ac is on and pump kicks in, this might be faulty...problem usually confined two these two scenarios......hope this helps

Feb 26, 2010 | 1992 Honda Accord

1 Answer

1997 oldsmobile lss-the ac compressor will not engage


Low on freon the clutch will not come on.

Jun 23, 2009 | 1997 Oldsmobile LSS

1 Answer

Screeching noise, then a/c stops blowing cold air. Still blows air, just not cold air.


it could be the air conditioning clutch going out. to check turn your car on and idle it with ac on and hood open. at the ac compressor it will have a pulley on it with a clutch that engages when the air conditioning is on. if it engages and disengages it can be the clutch itself has gone bad, the ac clutch will also disengage if there is not enough freon in the ac system, will also engage and disengage if the pressure gets too high in the ac system. Depending on the year of the vehicle it will disengage at full throttle and come back on when you are not at full throttle.
If it is a metallic sounding screech for example take a coke can and drag it across pavement kind of sound it could be a bad compressor or a bad ac clutch. If it is a more rubbery sound for example a car spinning its tires kind of noise it could be a loose belt.

1. Check to make sure all belts are tight under hood
2. start car and look at ac compressor to make sure compressor pulley is turning and that the fan clutch is engaged spinning


Aug 09, 2008 | Mercedes-Benz 400-Class Cars & Trucks

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