Question about 2005 Buick Century

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1995 buick a/c compressor will not on

A/c compressor will not come on / repaired freon leak and added freon to system but compressor still wont come on, i cant find low pressure switch for a/c to see if its bad

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  • jimlittle Sep 19, 2008

    bryant 329 its a 1995 buick century v6 motor its got 3 wires to the high pressure switch which2 would you jump out to test switch (rd blk grn wire from h. pressure switch thanks.

  • Anonymous Apr 01, 2014

    where do I put the Freon in the 2004 buick le sabre



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Usually it's the high pressure switch that goes bad first. what year make model is the car? need to know to tell you where the switches are located.

Posted on Sep 19, 2008


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The a/c on ford 150 2001 stopped working

Your Air Conditioning system has a High pressure switch in case the pressure goes to high and a Low pressure switch in case the pressure in the system gets to low. It could be low on Freon. Check the wire going to the compressor clutch to make sure it is still plugged in or is damaged.The high pressure switch is located near the compressor. The low pressure switch is locate on the filter/dryer near where the heater hoses go in to the heater. Make sure the wires are still hook up to both of these switches. Make sure the belt going to the compressor is tight and in good shape. If you have a set of gauges, check to see if you have at least 100 psi on the system. If not, it is low on freon. You may have a leak in the system. A can of leak detector die will help you locate the source of the leak. Unless you have a freon sniffer. Short of giving you a crash course in A/C repair, I have told you as much as I can. It you are not experienced in A/C repair, you should take it to a shop where they can check the whole system.

Good luck.

May 02, 2014 | 2005 Ford F-150 SuperCab

1 Answer

Ac compressor not engaging

The most common problem is low Freon levels. There is a low pressure switch which can be bypassed for testing, to see if the compressor clutch will engage or not.
You will need a pressure gauge later on, and some refill cans have built in gauges which come with them. The better way to do this is using proper gauges called "Manifold" gauges. Some may be borrowed from major autoparts stores.
The rule of thumb is that the system should not be contaminated with outside air containing moisture. A low pressure condition may be Restored by adding Freon with leak stop. But an empty system needs to be Vacuum pumped to eliminate moisture. A badly drained system may need compressor oil too.
Leak stop can help some systems, especially if the leak is on the low pressure side. There are gauges called sniffers, which can detect a leak. There are also chemical leak detectors for about $20 having ultraviolet light and glowing detector dye.
While this all may sound vague, it amounts to having a small leak that can be helped with leak stop and catching the problem before the system is completely drained. Every case is different.
Figure that you do not know when the leak started. If it was 5 years ago to run empty is different than 5 weeks or 5 days to lose all the Freon. The smaller the leak, the better chance that stop leak will repair it.
There are some CD's at Autoparts stores which will explain the repair process.
Also take into account that some techniques discussed in earlier times used $3 cans of Freon for testing. Today each can costs $7 to $17 and a car uses 3 or more cans for a refill.
So bypass the low pressure switch with a wire loop, then use leak detector with a leak stop before topping off the system. Look for leaks. If none are found, use the gauges and add Freon.
If you suspect the Low pressure switch is bad, then it is easily replaced without discharging the system.
I hope my info helps you.

Jun 02, 2013 | 1999 Lincoln Continental

2 Answers

Air conditioner blowing hot

The condenser is not where refrigerant is added to

You need special training & equipment to work on A/C

Have a repair shop diagnose the problem

Jul 27, 2012 | 1996 Chevrolet Cavalier

1 Answer

Where is the relay for the compressor clutch located

The actual part is usually a pressure switch. There are 2, one for high pressure and a second for low pressure. The low pressure switch is often on the black oblong tank or closest to it.

To test the low pressure switch you can unplug it and get an insulated looped wire to place into the harness connector you removed. Then while the engine is running and the controls are set for A/C, you briefly connect the wire into the harness to bypass the part.

If the compressor clutch makes a noise and engages, remove the wire.
The compressor is on a safety lockout. You must find a Freon leak and restore the Freon to the system. Depending on whether the Freon is all gone or just low will determine your next step.

You can borrow gauges from Autozone, Advance, or Oreilys for a refundable deposit. If no Freon is present, you need to purge the system after fixing the leak. There are additional products used to find leaks.
Ask at the autoparts places. There are also leak sealers.

If you are lucky enough to be just low on Freon, adding a can of Freon with sealer may fix it. The autoparts places can tell you more about this.

The common mistake is in overfilling the system or with severe leaks, failing to add oil to the compressor. The gauges, manifold gauges as they are called, are needed for best results.

You want a moderate charge in the system. If you are off on either high or low end pressure, the switches will kill the compressor clutch. A moderate charge will keep the compressor operating more steadily.

Aside from the pressure switches, the system can have a fuse in the fuseblock. I believe your problem will be with the pressure switches and low Freon.

Apr 12, 2012 | 2004 Ford E250

1 Answer

Compressor starts then shuts off

Hello, This usually happens when the Freon is low or if someone has added Freon, the level is too high. You need to use a gauge on the low-pressure fitting to determine the minimum pressure in the system with the A/C on and the engine running.

The low pressure fitting is usually on the black oblong tank or close to it. There is a connector on the A/C line from the black oblong tank where it looks like a switch attached to the line. There are 2 switches, but the low pressure side is closest to the black tank. Remove the connector and make a "U" shaped wire connector to insert in the wire. This will jump the switch and activate the compressor clutch. Then the system is ready to draw in the Freon and after the first can, should be ready to work without the jumper wire. Reconnect the wire to the low pressure switch and measure the pressure with a gauge. Then top off the system. There should be a label in the front of your van with the capacity of the A/C.

It is best to initially purge the system with a Vacuum pump, but most top-offs will last at least a Season if you have no leaks. You can get tools under the loaner programs at Autozone, Advance, and Oreillys. There are also products which can stop leaks, trace leaks, and if your compressor is noisy, add oil to the system. Ask your parts counterperson about them.

If you find the the system has proper Freon, but cuts out, the Low pressure switch is easy to change and is what you change if you find through bypassing this part, that the system works better.

If you do not want to go through all of this, jump the Low pressure switch, add a leak repair additive, add some Freon until the compressor engages steady.

Jul 04, 2011 | 1997 Ford Econoline

1 Answer

My ac is blowing hot air. I've checked the gas and it's full. The compressor seems to cut on and off about every 10-15 sec. Do I need a new compressor or do I have some sort of fault switch? Any...

Hello, You need to check how much Low end pressure you have. The Low pressure cutoff switch will disconnect the compressor if the pressure is too low. The high end pressure switch will do the same thing for extreme pressure.

Sometimes the Low pressure switch will get weak and cut off the system too early. Just change this switch which will come out with only a slight puff of Freon being lost. You can jump the connector with a U shaped wire and bypass the Low pressure cutoff switch. If the compressor works better and does not cut out, it can still be low on Freon or have a bad Low pressure switch.

However, if the compressor cuts out a Second time with the Low pressure switch bypassed, the system is probably overcharged and the HIGH pressure switch is cutting off the compressor. You need to purge some Freon out of the system if High pressure is indicated.

Where it gets tricky is the Compressor will compress both Freon and Atmospheric air. Your efficency drops when the Freon is displaced by Atmospheric air. You will need to find the leak in the system which is allowing Freon to leak and outside air to enter the system. You will get a pressure reading with any gas in the lines.

There are Leak detectors and sealers for the system. I hope you just have a bad low pressure switch which is the easiest solution.

Jun 25, 2011 | Ford F-150 Cars & Trucks

1 Answer

Air conditioner won't work added freon changed low pressure switch compressor comes on when jumped across at low pressure switch just no cold air

The low pressure switch turns on appox 26 psi. If the pressure is lower than that, it wont work, you have a leak.

Jun 03, 2011 | 2001 Chevrolet Silverado 1500

1 Answer


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

My ac wont get blows hot air and(caddy seville 95)

Below is a guide to troubleshoot and check system function. This can be done by most folks.

Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.

If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.

The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.

The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon
and fill to system capacity.

The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.

The system should be filled until suction pressure is about 30 to 38 psi..

Remember the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer2_bing.gif back to the compressor suction.

May 29, 2010 | 1995 Cadillac Seville

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