Question about 1993 Chevrolet Suburban

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Any suggestions? my a/c compressor is not switching on...and it is not accepting freon. i tried bypassing the switch by using a paper clip, but that did not work. I was told there is too MUCH pressure in the valves. anyone know what to do besides taking it in and spending a small fortune on repairs?

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Get a a/c pressur gauge n make sure ur putting freon in on low side cause it wont go in high side

Posted on Jun 14, 2008

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My AC stopped working. I can see that the compressor clutch is not engaging. My Freon pressure was very low so I added to the proper level. But still doesn't work.


I need year--make--model?
You removed the fuse and used paper clip in the fuse socket? I'm just trying to understand what you did with paper clip?

Apr 04, 2016 | AC Cars & Trucks

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1993 Eldorado Cadillac ac compressor won't take freon. Display says compressor off, low refrigerant. How to bypass computer? Can compressor relay be jumped using paper clip? Which holes? to


Grab some refrigerant gauges and take readings. If the low side has more than 40 psi or so of pressure, the low limit switch will close and allow the compressor to run. If there is indeed low pressure causing the compressor not to run, you will need to flush the system after eliminating the source of the leak. If the a/c compressor has never been changed, it is probably the source of the leak.

Feb 18, 2015 | 1993 Cadillac Eldorado

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How to bypass ac compressor on 99 expedition


Why would you want to bypass the compressor? Do you mean to bypass the shut off switch? If the system is low on refrigerant you can bypass the switch by removing the plug and jumping it with a paper clip. Running the system when it is low on R134A would mean it is also low on oil. I recommend adding a oil and refrigerant charge.

Jun 18, 2014 | 1999 Ford Expedition

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

2 Answers

My 2005 Honda Element EX A/C compressor will not kick on, any ideas why, I check all fuses and relays they are good?


The refrigerant may be low or empty due to a leak. If not here are a few ideas you can try. If there isn't any refrigerant in the system, you WILL damage the compressor if you bypass any of the safety switches to test. The low pressure cutoff switch or high pressure cutoff switch may be bad. Try removing the low pressure switch electrical connector and jumping across it with a paper clip.

Jun 07, 2011 | 2005 Honda Element

1 Answer

When I put paper clip ac works but Otherwise it ...


The low pressure switch on the a/c line is at fault or you have to little freon in system to make the pressure switch work. The low pressure switch is put in the a/c line to keep you from burning up the a/c compressor. Anytime the freon fall below a certain level (pressure) then the switch will cut out to keep anything from burning up. Hope this will help you.

May 20, 2010 | Cars & Trucks

2 Answers

How do you jump a/c compressor so it will take the freon?


The interuptions in compressor engagement is due to low side drops which is controlled by the pressure switch mounted on the low hose or large metal accumulator on the passenger side. Low side hoses are larger and the accumulator is on the passenger side engine compartment...a paper clip works fine jumping this low side pressure switch out until freon pressures increase enough to keep compressor running to accept freon.

Jul 19, 2009 | 2000 Dodge Stratus

1 Answer

The A/C doesnt work although its topped out.


Verify compressor operation. With it idling have the hood open and watch the compressor, and make sure the center of the wheel turns. If it doesn't then you either have a bad wire, fuse, relay, pressure switch, or compressor clutch. Check the fuse first, if its good then locate the pressure switch, most of the time its on the drier near the front behind the grill or near the fire wall at the passenger fender. Pull the connector off and there should be two pins in the connector. Take a jumper wire or even a large paper clip will work and connect them together to see if the compressor kicks on. If it does then you have a bad switch and will need to be taken to a shop that can drain and recover the AC coolant. Take it to a shop that can put the old freon back in it. And try to be in the shop when they do the work so that they can't charge you for new freon if they put the old back in. My AC doesn't work due to a bad pressure switch. And make sure you don't run it with the pressure switch bypassed, otherwise the system will blow up.

Jul 15, 2009 | 1995 Chrysler LHS

3 Answers

A/C Compressor not kicking on


The power to run the compressor clutch coil goes from the battery, to the AC Clutch Relay, somewere in the engine compartment fuse box, then it goes to the positive side of the AC compressor clutch coil; goes thru the coil, activating the compressor, and then goes to complete the circuit through another switch (high pressure protection switch) in the back of the AC compressor and finally reaching negative or Ground.

Disconnect the AC compressor clutch connector and using a 12 V bulb with 2 wires (test lamp) check the following:

1.- connect 1 lamp wire to battery neg; with the other check both pins at connector with the AC in the RUN (AC and ignition switch on ) you should have power in one side.

2.- connect 1 lamp wire to battery positive and with the other check both pins at connector, lamp should light getting the ground from the clutch connector thru the high pressure compressor switch to ground.

On the other side what makes the relay close and let the power flow to the clutch works with the low pressure switch, (if the freon pressure is too low it opens and kills the ground to the relay coil and that kills the compressor), that low pressure switch is in the low pressure side of the freon tubing, the fat pipe that comes from inside the firewall into the accumulator/dryer, a big aluminum cylinder sitting on the right side of the engine compartment in GM cars.

To know if the low press switch is the cause you can unplug it and connect both legs with a paper clip for a minute or two, no more, you don't want to damage the compressor. anyway if jumping the switch makes the compressor come alive and kick in, you either have low freon pressure or a bad switch; it's time for the pressure gauges and check how the compressor is pumping and that is better left to a pro.

By the way you said that your system is a R-12 system, have you considered switching to R-134a the new "ozone friendly" freon? to do that you need to evacuate the system with a recycling machine and pull vacuum in your AC, if it holds the vacuum for a while, then you can be sure that there are not leaks and then dump 1.5 or 2 pound (check the labels in the engine compartment) of R-134a into your system. it will be a good idea to put some fluorescent leak detecting dye in the system to check for leaks, just in case..

Jun 13, 2009 | 1992 Oldsmobile 88

2 Answers

A/C sporadic compressor. Bypassed high and low with paper clip. Pressures good has Freon. Clutch tests OK. Vehicle runs for maybe 10 min or some times 30 then A/C shuts down. Maybe A/C will fire up...


This is just a suggestion but you should check to see if you have a thermostatic control switch in your evaporator this could be the cause if the intermittent problem.The switch is actually used tokeep your ac from freezing up i believe.

Jul 24, 2008 | 1999 GMC Suburban

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