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Question charging older Diablo AC system.

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Hi, good friend of mine has a 1991 Diablo, he wants to get his AC charged up, is there any info on procedure? and amount of freon or other coolant needed?

 

Looked on Lamboweb, couldn't find anything.

 

Any help appreciated

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If you go by the book, you're suppose to evacuate the system, find out how much freon by weight the system holds, then weigh, and put in the exact amount. Alternatively, you can use any number of those trigger guns with gauges that screw on the freon cans, they're all over the place. You attach it to the low side of the AC system which should be located above the driver side rear wheel, and wheel arch. (that's where it is on MY year 97), don't know if it's there on 91 models. You can access it by jacking the car up a few inches., reach in there and snap it on the fitting which has a screw cap on it. The unit I use has a gauge on it and when it measures in the blue area then the system is pretty much filled. I have to do this once a year. Woks good, it's fast and safe.

 

On yea, start the car and run the AC on full cold, pull the trigger, the can will get super cold and frost over.

 

Obviously this will only work if the system is otherwise good, and just leaks freon.

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