Where do I put Freon in.. A/c compressor going nuts 2000 blazer

Just wondering where to put freon in on my 2000 blazer.. Ac/ compressor is cycling on and off every 5 seconds!!! Blow very little cold air.... Is this a low freon issue??

Just wondering where to put freon in on my 2000 blazer.. Ac/ compressor is cycling on and off every 5 seconds!!! Blow very little cold air.... Is this a low freon issue??

There is a R-134a fitting on the low side line for adding r-134a.
But first you need one of these type gauges to check your low and high side pressure readings.
http://www.ackits.com/merchant.mvc?Screen=PROD&Store_Code=01&Product_Code=66773&Category_Code=RefrigerantGaugeSets
Do not even think about one of the Wal mart one hose death kits.
Check your low and high side pressure readings at idle and at 2K rpm and post back pressure readings.
And remember if it is low or you have a leak you need to fix the leak first.
The newer systems it is very hard jst to add freon and get it right.
The system should be pumped down with a vacuum pump and the set R134-a charge added.
MT

You can get a cheap "knock off" manifold guage set here for 30 bucks: http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=92649 I bought one last summer and it worked fine, but it's still snowing here so I haven't had a need to use it yet this year.

Thanks for the info guys... I appreciate it...