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First your ac comp has a clutch. second r 12 and r134 are NOT compatible if you just "add a pound of r134" you will kill your entire ac system. The O rings, dryer and pressure switches are not interchangeable nether are the lubricants and you WILL burn up your ac comp. Just a word or caution. It is probably the ac speed sensor to detect slip.
Overcharging your a/c will cause it to blow hot .The on and of issue may be caused by the High pressure cycling switch . overcharging may be the culprit as well. you need to find out how much r134-a your system takes .
In your A/C control you have two rotary switches, if you set it at blue side it mean you select it for a/c if you select it for white or read it will blow hot and switch off a/c compressor this the basic, in your car have climate control a/c system it will select need to switch on a/c compressor or not by your settings and temp sensors reading , is this information helped you?
first the a/c system need to be put into a vacuum before you add r134. how much r134 does you system need? too much or too little will both get you warm air. does the compressor come on? air in the system will get you warm air too.
Check the fuse for the A/C and try refilling the A/C with R134. You can buy the re charge kit at Auto Zone or Wal Mart, almost any Auto parts store. If the system is low on R134 the A/C compressor will not activate to keep it from burning out.
Try checking the fuse first then re charge the system with a can 12oz of R134. Just keep in mind not to over charge the system. Just follow the instruction and you'll be fine.
Keep me posted, be glad to help out.
If your compressor is working the low side should be 15-38 psi. If you have 100 psi that means the compressor is not doing what it should. Make sure the outer clutch is engaged with the pully. If not A/C system check should be done.
Your vehicle has the R-134 system. These systems usually don't have a charge site glass window. Just because the compressor turns doesn't mean the system is full. You need to hook up the hi and lo side of the system to evaluate the systems operation. Too much R134 will adversely affect the performance of the system producing warm air. You could have a bad expansion valve contributing to the systems malfunction. You can find the problem by hooking system to a set of manifold gages.