Question about 1996 Mercury Grand Marquis

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I would like to know what is meant by use the correct oil charge for AC compressor to work properly? also if the compressor became weak ,is it possible to do maintenance for the compressor to regain power ,or must be replaced ?

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That size system will usually require about 2oz. of refrigerant oil. when you recharge the system for proper operation. this is available in the same container with your refrigerant (r-134a). check the evaporator housing or fan shroud for recommended amounts.

Posted on Apr 27, 2010


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Did you add the correct amount of oil to the compressor? Is it overcharged? Did you evacuate all the air with a vacuum pump before charging? Was the fixed orifice replaced? If you are sure you did the install right and the oil and charge are correct you have another defective compressor

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On my BMW 325XI Wagon, the ac is not cooling, the drier, expansion valve, compressor & ac control module have been replaced. Starts to cool as low as 65 degrees & then compressor shuts off.

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Where do i add r134a to my 1996 mercedes c220

Refrigerant goes in the low pressure hose, but this job requries special tools and equipment, and MOST IMPORTANT, training. It is not just adding refigerant that makes the system work correctly.

At a given ambient temprature, you need to have a certain pressure, measured with AC gauges. Over or under charge can result on system malfunction, or destruction. Oil moves with the refrigerant, so low refrigerant will not move oil and you can wreck your compressor.
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You were planning to also replace the receiver/dryer, correct? It also needs the oil in it measured and incorporated into the amount of oil (in %) that would need to be added. FAILURE to address these and other issues will guarantee premature system failure and likely compressor damage.

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1 Answer

The ac compressor clutch does stay on

Hello narto7
If you replaced the compressor yourself and tried to charge the system with those booster cans from the parts store, then air and moisture remained in the system. This will prevent you from getting the correct
charge and the correct pressure in the system. This can cause the lowpressure cutoff (on the accumulator right side of firewall) or depending on how much R134 was put in) the high pressure cutoff (on the compressor) to cut power to the compressor clutch assy. If this is
the case, have the system evacuated and charged with the proper
equipment and that should clear it up. However if it was charged properly, check the 2 cutoff switch's I mentioned. There should be power in and power out on both with the a/c on. There is also a relay
for the a/c you can check. But due to the split year in 95 it's located in
1 of 2 places, in the fuse relay block under the hood or under the right
side of the dash above the glove box. Remove the box for easier access. Hope this helps

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Low charge or bad sensor telling the system it has low charge, or dryer is clogged.

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