TW> One has to pay careful attention to the instructions as it is very easy
TW> to Overcharge the system. And it causes problems, some of which can
TW> damage the compressor.

Yes, overcharging can damage the compressor and also make the system not
blow cold air.  

Most of the re-charge kits available come with a gauge on them.  I would
highly recommend using one of the hoses with the gauge so you are not
blindly adding coolant.  

I have two of those hoses that I put on the cans when needed.  I used to
carry one around with me in the Monte Carlo when I had the leak.  Now that
it is fixed, that isn't really necessary.

- Mark

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