Re: A/C recharge in 97 E320 - catch 22

On Thu, 10 Jul 2003 17:52:21 -0400, "Darryl Cummings"


The EC button turns off the compressor. But you won't get the compressor to run at all if the refrigerant pressure is too low.
Regardless, you charge the system without running the compressor anyway....
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Lettuce spray for whirled peas...

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The proper way to charge it is with the system OFF, after pulling a vacuum, put the exact, correct amount of R-134 in by weight. Yes, this requires a vacuum pump and a scale.
Bill Ditmire Ditmire Motorworks,Inc. 425 White Horse Pike Absecon,NJ 08201 http://www.ditmire.com 609-641-3392
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The EC button is a EConomy button to block the compressor from operating. Default is for the compressor to run, EC prevents that.
The fuses in your car are located below the rear seat, right side, next to the battery.
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You can short the pressure switch (pull the connector off the switch and insert a "U" shaped wire), which I am assuming is keeping the compressor clutch from engaging. Get the R-134 connected to the suction side, can up side down and engine off. Open a 1# can's valve. Shake the can every few minutes to see if it's getting lighter. When about half empty, turn the can upright. Now start the engine and turn the AC on to as low a temp as it will go to. If the clutch still doesn't engage, short the pressure switch. Watch the sight glass for bubble flow. After 30 seconds, unshort the plug and reconnect to switch. See if there's enough system pressure to engage the clutch. Keep adding refrigerant, can upright, until you see very few bubbles flowing (mostly liquid). That should be enough. Check the bubble flow in a few days when it hot outside.

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