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Low freon and low pressure cutout open preventing clutch from coming on

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Before you add Freon, you should check the leaking first, if the Freon is too low, sometimes cause this kind problems. use color Freon test it and tight the leaking area and then add Freon, you can not do it yourself because the law say.

Posted on Jul 27, 2008

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Hi my name is leo and I have a 2002 jeep Cherokee Laredo a/c clutch will engage


Faulty low pressure switch , Google it to see how to replace, or you an unlucky it and run a jumper wire between the terminals/ But beware- bypassing the low pressure switch can ruin the compressor if it gets low on freon.

Jan 25, 2015 | 2000 Jeep Grand Cherokee

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How jetta compressor clutch work


Ac compressor clutches get power from a relay via pressure switches.
If the system is low on freon, the low pressure switch prevents the ac clutch from engaging.
The clutch is a magnet.

Jul 05, 2012 | 1998 Ford Windstar

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AC not running in my 1998 Jeep Cherokee. Changed AC clutch compressor RELAY, freon level is good, temperature sending unit replaced along with cooling fan! Checked all fuses still good. Can't seem to...


Hello, You have two switches which work off the pressure of the Freon. Both of these switches cut off the power to the compressor. One is for HIGH pressure and the other is for LOW pressure. Check for power at the compressor clutch connector harness while the controls are set and the engine is running. You may have power and a bad clutch.

When you say that the Freon pressure is good, does that mean the pressure is within the proper range? Too much Freon will make the HIGH switch cut off power and too little will make the LOW pressure switch cut off power.

The ideal amount(ozs) of Freon is what is recommended by the Manufactuer and it will provide a moderate amount of pressure of about 35psi-40psi. You can borrow pressure gauges, called Manifold gauges to measure your system at autoparts stores with loaner programs.

The low pressure side of the system is the one you use to induce the Freon to go into an empty system. You can bypass this switch by taking off the connector and putting a "U" shaped jumper into the harness and the compressor clutch should get power to LOCK up all of the time.

You can take off the switch connector at the compressor clutch and then check for power when bypassing the HIGH pressure switch if the LOW pressure switch does not make the system get power. Only, really only bypass the HIGH pressure switch with the clutch connector disconnected. The HIGH switch is there to prevent damage to all of the components from seals to lines to every piece of Freon hardware in the car. Bypassing with the A/C clutch disconnected will allow you to know if power is getting to the compressor clutch.

Finally, you can get FREE wiring and fusebox diagrams through Autozone.com. Just sign and register to their site and then you can print the documents for yourself.

Good luck with this repair and I hope my solution helps you.

Mar 19, 2012 | 1998 Jeep Cherokee

1 Answer

I have a 97 suburban. The A/C clutch engages (and I have cold air) then with disengage (warmer air) and later engage again. I cannot figure this out.


It sounds like you have a low freon condition in the AC system.
1. Go to the passenger side fender and look over the fender and to your left.
2. There should be a silver aluminum looking cannister that has an Air conditioning line attached.
3. Look for a little sensor with a plug attached (probably has 2 wires)
This is your low pressure AC cutout switch.
4. Unplug the connection and cross the two wires together with a paper clip or small cotter pin.
This will bypass the low pressure cutoff.
5. If the AC runs continuously when you do this.. then you have low freon in the system or a faulty low pressure switch. (Do not run the system permanently like this.. it could damage your compressor)

Best of luck..

Aug 18, 2011 | GMC Suburban Cars & Trucks

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

2 Answers

A/C clutch not ingaging. No power getting to clutch. Could this be a fuse or do you know it might be? The car is a 1996 Buick LeSabra.


This could be several things. first: could be that the freon has leaked out to the point where it is low enough the unit cant start. second: could be that a pressure switch has it locked out. and third: could be a fuse.
i would start by checking the freon in the system.

May 15, 2011 | Buick LeSabre Cars & Trucks

2 Answers

2002 ford mustang air conditioner stopped working. How do I locate the problem?


FIRST I CHECK ALL FUSES AND RELAY.TO BLOWER MOTOR IF IT STOP BLOWING.AND CHECK FUSE TO HVAC SWITCH CONTROL.AND CHECK FUSE / RELAY TO AC COMPRESSOR.IF FUSE / RELAY GOOD POWER GETTING TO AC COMPRESOR CLUTCH COIL AND LOW PRESSURE SIDE 28 PSI AND HIGH SIDE 200 PSI. CLUTCH COIL IS OPEN.IF REFRIGERANT LEVEL LOW YOU MAY NEED MORE REFRIGERANT.YOU NEED AT LEAST 28 PSI ON LOW SIDE AND 200 - 220 PSI ON HIGH SIDE.IF ALL IS GOOD STILL NO AC PROBLEM COULD BE A FAULTY AC CLUTCH CYCLING PRESSURE SWITCH.

Aug 16, 2010 | 2002 Ford Mustang

1 Answer

DON'T HAVE POWER IN COMPRESSOR


Check your fuse for the A/C. If it is okay then you need to locate the low pressure cutout switch and temporarily put a jumper in the connector. If the clutch kicks in, then you need to check the Freon pressure on the oblong black tank or hose directly adjacent to this tank.

Do not run the compressor very long with the bypass.connected or the compressor can burn up. However the compressor must turn to build pressure from the remaining Freon.

If you are lucky the Freon will only need to be topped off. This means the Low pressure switch did its job of preventing damage. Add Freon with a Sealer and you may close the leak that let out the Freon. Some of the gauges are not expensive, and some cans have a one-time use gauge on them.

The low pressure switch can also get weak and shut your system off early. Its a screw off-screw on part and easy to replace. Then if your compressor is noisy after working on this you may need an oil charge. That would mean you had a substantial leak and you lost the lubricant for the compressor. But you may be lucky and get by just by adding Freon.

I wanted to be informative in case the easy steps do not work for you so you can try several things. Good Luck on your repair.

Jun 22, 2010 | 2006 Ford F-150

1 Answer

AC does not work, clutch will not engage


Most likely low or out of freon.There is a low pressure cut-out switch that open's when low on freon to prevent damage to compressor.

Aug 04, 2009 | 1994 GMC Sierra

1 Answer

Air Conditioniong not working


U may be low in Freon gas.
When Freon is low there's low pressure switch that will prevent A/C compressor clutch from engaging to protect it from failure.
So, first check Freon pressure & any leaks form lines & hoses fittings.
Even if the fan is working, that doesn’t indicate proper compressor OP'S.
Look at the compressor front side you'll see the clutch stationary while the AFT pulley moving.

Then put air-condition compressor switch to ON (Engage),
You should see the clutch engage & start rotate,
If NOT, this is very clear indication u r low in Freon.

Regards;
MAR

Jun 03, 2009 | 2003 Dodge Caravan

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