Question about 1995 Jeep Grand Cherokee

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A/c cycles on and off but won't cool. IT won't let me put in much freon either. What might cause this problem

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  • edward_s07 Jul 15, 2009

    twenty on low and 45 on high

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You say you cant put in much freon, why? you should be able too, even to over charge it. But I want you to check the power to the clutch when it cycles off, if you still have power at the clutch wire (12voltsdc) and the clutch cycles off you have a bad clutch coil, or the wiring at the clutch has a bad crimp. If you loose power to the clutch then the controls are cutting it off, (low press / hi press) switches one or the other. .

Posted on Jul 15, 2009

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Electric fan not working or too much oil in the system what is the low pressure and high pressurewhile system is running

Posted on Jul 15, 2009

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2 Answers

I tried to fill ac system and compressor was cycling then just quit cycling and ac light on instument panel is flashin


probably to much Freon! when adding Freon always put a/c to its coldest setting and make sure its on max!

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Look for the large ac line/hose coming out of the ac compressor,and follow that line until you come to a small ac port,this is the low side where you will hook up to to charge.I take it you have purchased a charge hose and freon?Put the can of 134a freon on the can tap at end of charge hose,and the quick connect will snap on the low side ac port on the vehicle.Turn the freon can upside down and turn the t handle on the can tap until it pierces the can.Start the vehicle,and set all settings high blower motor,max air,recirculate mode.The ac compressor should cycle on and off,this is normal,until there is enough freon in system.When the can starts to empty,shake the can lightly until empty.It will be hard to tell,but you will figure it out.Turn the can t-handle back out,and unscrew the can an repeat process until enough freon is in the system.You can get to much freon in the system.so see hoe much it takes to fill it on the label under the hood.If the system was not empty,it won`t take the fill amount,go slow,and feel the cold parts(large ac line near the firewall).They should get dern cool,to cold,and sweating really good.Stop when this happens,and it is cool inside.

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If you still have freon in it you can try a new low pressure switch. You should find it around the oblong tank. You can unplug the switch and jump the plug to see if the clutch engages. Moderation is the key. Put in the correct ounces of Freon and the system should cycle. Too much freon it will cut out-too little it will cut out. You want the pipes to sweat or frost and the compressor to go off and on. Also be sure you put in an oil charge for that new compressor.

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You need to fill Freon gas... maybe it's empty.

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