where is the low side line to charge a/c
 

which fittin gon the compressor is the low side to add freon. the hose one the very top or on the side? anybody know
(factory a/c comp in 87 targa)

Get a mirror and look at it from behind, it should say L=Low and H=High or S=Supply and R=Return. You want the LOW PRESSURE connector - before it compresses, which means L or R. If any doubts DON'T.

I assume you are adding R-12 to an OEM system. High side is the one going to condenser (deck lid). Low side is the one coming from the front of the car (evaporator). Deck lid should be down (almost closed) when adding refrigerant. If this makes no sense to you, get additional assistance. Wear safety goggles.

The low side is the line that is larger in diameter,it should be the line that comes down the passenger side of the car coming from the evaporator.If you have a engine lid condensor you will notice that one of the lines from the compressor goes to the condensor that's the high side.Good luck.

If you do not know which one is the low side of the compressor are you really sure you should be doing this type of maintenance? I know of people who have had their hand blown off by doing exactly what you are trying and got it wrong.

If you have not been trained at how to do this, and by a professional, please let a professional to it! Nothing against you but this can mame or kill you if not done totally correct.

JoeA

thanks guys, i will look at it, and if unsure i will take it to a shop
thanks again

I believe you may also see S (suction) and D (disharge)

I agree with Joeaksa if you never work with a/c systems before and don't know the difference between the low side from the high side, connecting a can of freon to the high side could cause the can to explode (low side pressure is only about 45 psi whereas high side pressure could be over 200 psi). Have someone who knows something about a/c system help you or take it to a pro.