Question about 1997 Cadillac Seville

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Same problem Low Refrigerant, Compressor off, try to recharge with r-134a but it always has the pressure at over 80psi.  so I bleed it, and within seconds its in the red again.  I think the main problem is that it will not turn the a/c on when i am trying to recharge probably b/c of the compressor being turned off because of the low refrigerant.  Any ideas of how to recharge the a/c?   it is a 97 Cadillac Seville SLS

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I had the same problem. The thing is you need to have the air on while you're recharging it and the compressor won't turn on. I was able to recharge the air by disconnecting the positive battery cable and reconnecting to reset the computer and immediately have someone inside the vehicle turn the air on before the computer can recognize that the refrigerant is too low and disable the compressor again. This will allow for the compressor to turn on and for you to recharge the air. Make sure that you have the replacement refrigerant connected before you turn the ac on so the refrigerant goes in and keeps the compressor on before the computer catches it again.

Posted on Jul 02, 2009

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I had to take mine in to get recharged and they had to reprogram the compressor to come on.

Posted on Dec 16, 2009


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134a american gas

Refrigerant HFC-134a or R134a
Weight 330 - 390 gms
With correct refrigerant:
Low side pressure 1.5-2.5 kg/cm2
High side pressure 14-16 kg/cm2

Sep 19, 2013 | 2011 Toyota Yaris

1 Answer

97 e350 van no power to compressor clutch, have power to pressure switch , i jumped pressure sw wire still no power to clutch

By the compressor clutch I assume you mean the a/c clutch if so read on:

The air-conditioning system in your Ford is basically a circulation loop through which refrigerant is pumped by a compressor. The refrigerant is a combination of gas and liquid that becomes very cold as it is compressed and then expanded. The chilled gas then flows from the compressor into an evaporator coil. The cold refrigerant now inside the coil has air blowing across the fins and tubes of the coil, thereby cooling the air, which is transferred into the car. By following the procedures below, you can remove and replace the A/C compressor clutch in your Ford vehicle at minimal cost.

    • 1

      Have the air-conditioning system discharged or evacuated of refrigerant by certified personnel at a dealer service department or automotive air-conditioning repair facility.

    • 2

      Raise the hood and disconnect the negative battery cable terminal from the battery using a box-end wrench.

    • 3

      Disconnect the electrical plug-in connector from the compressor clutch by hand.

    • 4

      Remove the drive serpentine belt from the compressor clutch pulley by taking the tension from the pulley using a breaker bar and compressing the torsion spring tensioner.

    • 5

      Disconnect the refrigerant lines from the compressor with the box-end wrenches. Plug the open fittings to prevent the accidental entry of dirt and moisture; quarter-inch rubber stoppers are a good fit for these connections.

    • 6

      Loosen the mounting bolts with the box-end wrenches, and remove the bolts from the compressor clutch mounting bracket and lift the clutch out of the vehicle.

    • 7

      Pour out the refrigerant oil into a graduated container so you know how much new oil to add to the new compressor.

    • 8

      Installation is in the reverse order of removal. Always replace all O-rings with new ones that are specifically made for use with the new R-134a refrigerant. Lubricate the new O-rings with R-134a-compatible refrigerant oil.

    • 9

      Evacuate and recharge the system with the proper amount of R-134a refrigerant by the same certified mechanic that discharged the unit before you replaced clutch. Have the mechanic start the engine and let it run for a few minutes; this will let the system stabilize and the compressor cycle on and off.

Sep 05, 2012 | Ford E-350 Cars & Trucks

1 Answer

AC compressor not coming on

It is likely low on refrigerant. There is a low pressure switch that inhibits the operation of the compressor when there is not an adequate amount of refrigerant. If you have an R-12 system, you can retrofit it to accept the R-134A refrigerant charging equipment.

If jumpering the relay contacts does not engage the compressor, the clutch coil may be burned out or wire broke. If it is a failed clutch coil, you may need to replace the compressor because many of those parts are not being carried anymore.

May 30, 2012 | 1999 GMC Jimmy

2 Answers

I put a can of 134a it seemed to help but still blew hot air sometimes while putting in a second can I noticed the cluch on the compressor engaging and dissenguaging quickley.Is the compressor bad?

1) get a gauge to check on the low side pressure when adding refrigerant to see if it's too low or too high.
2) if in the proper range check again in a few days to see if the pressure is holding and you don't have a leak that requires a teardown & repair.
3) the fact that the compressor (clutch) IS engaging and disengaging suggests that that part of your system is working ok. IF you can get normal refrigerant levels then you can start troubleshooting the fast cycling.
4) and online manual here:

Jul 20, 2010 | 1994 Toyota Pickup

1 Answer

Locating the High side and Low side AC gas ports

Easy. find the compressor. The larger hose attaching to the compressor is the "suction" side. This is where you install the refrigerant.

The smaller hose, whether rubber or metal as it travels to the passenger compartment, is the high pressure side.

After installing refrigerant and as the compressor is running, the larger hose will feel cool and the pressure side will feel hot.

Jul 29, 2009 | 1998 Dodge Caravan

1 Answer

The air conditioner blows hot air. Is there a way I can test for a leak in the system or does this require a technician? I am thinking it's not a compressor because it is blowing.

Apart from doing a low side pressure check, you can try to recharge the system yourself with a refill kit that's readily available at most auto parts stores. If you're concerned about a leak, also get a can of R-134A with the UV dye that will show any leaking components.

  1. Turn the truck on and turn AC on HIGH
  2. Locate the low side AC line (will have a valve and cap similar to the cap on a tire)
  3. Insert the oil or R-134A can to the hose (Do not turn the screw to puncture the can yet)
  4. Insert the other end of the refill hose to the low side valve
  5. Puncture the R-134A can with the screw on the refill hose
  6. You should feel the system suction the refrigerant out of the can
  7. Check for frost on the AC lines and the air blowing inside the truck
  8. If frost develops and the air is cold, you've successfully recharged the system and disconnect the refill hose. DO NOT ADD MORE REFRIGERANT...overcharging the system will damage your compressor and will be less effective
Hopefully this answers your question and you're able to get your AC working again. Best of luck.

Jul 13, 2009 | 1996 GMC Sierra

1 Answer

The a/c on my 2006 honda pilot is not owrking and appears to have a low refrigerant charge. I want to recharge it and find the leak with die. what is the amount of 134a to be fully charged

Adding freon or topping off a cars A/C system is the most common task performed to restore performance and get cold air blowing again. However, adding refrigerant isn’t always the solution for car air conditioning problems. There can be many other things wrong besides a system being low on refrigerant. To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.
Keep in mind that using an A/C gauge set and seeing BOTH high and low side readings can help in diagnosing the problem when you know what to look for. First, on a 134A system the high and low side service ports are different sizes. AC gauge sets have color coded hoses, the blue color coded hose has a connection that fits on the low side service port and the red hose has a connection that will only fit onto the high side. The yellow hose won’t hook up to anything if just checking the readings; it can be used to connect to a vacuum pump or attached to a refrigerant can or tank.

*Make sure the condenser fan comes on when the readings are being checked.

Normal readings on high and low side with AC OFF (static pressure) - Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s - Ranges from 25-35 PSI - Note that on many Chrysler products a normal reading on the low side may be 15-25 PSI
Normal high side reading ranges from 200-350 PSI

Don’t assume that if adding little Freon is good that adding a lot is better!  Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold - STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the R143a and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood. 

Hope this helps. Keep me posted, be glad to help get you cooled again. 

Jul 01, 2009 | 2004 Honda Pilot

1 Answer


Your AC is low on refrigerant; The AC compressor needs a minimum amount of regrigerant to run. If and when it does run (while low on refrigerant) the air coming out of the vents will not be cold. The refrigerant you require is R-134A and is available over the counter but if you are the least bit unsure as to how to add refrigerant, taking it to a garage that does AC recharging would be your best play. If you want to try to add refrigerant on your own you will need the following, 1LB can of R-134A, an AC hose adapter to deliver the refrigerant, and preferably an AC pressure guage to ensure you are not overfilling the AC line which will damage the system.

May 10, 2009 | 2004 Honda Odyssey

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