Where can I get awiring diagram fo the A/c system on a 1996 chevy S-10

there's a pressure switch on the receiver/dryer tank on your system id bet , this is momentarily shutting off your compressor clutch as the receiver tank is being pulled m/t of refrigerant , this most times is an indicator of a small hole in system and some of your refrigerant charge has leaked out , a pressure gauge would confirm this

note: automotive ac systems possess high pressures that can seriously harm anyone that opens the "wrong" line
always obtain a good tech's help if your knowledge is not enough on this

There is also a relay to check. If relay is ok, the compressor clutch or wiring to it may be faulty

There are 2 pressure switches on the refrigerant lines. Pull off a connector and short the wires on the connector. If the clutch engages then the pressure switch is bad.

May have a bad low pressure/cycling switch. Its a two wire switch and normally found on the dryer/accumulator. You can unplug that wire and jumper it. If the clutch kicks on then either the system is too low on refrigerant to activate the switch or the switch is bad.
That switch can be replaced without loss of refrigerant because there is (or supposed to be) a shrader valve in the dryer.

The r134a pressure may be low in the refrigerant lines causing the compressor to not engage as a safety measure for the compressor.

Take your truck somewhere else... "wouldn't take charge" doesn't even make any sense... The A/c system on any vehicle has 2 switches, high pressure, which is a "fan request/safety" switch that turns off the compressor clutch and turns on the engine fan in electric fan applications when refrigerant pressure reaches around 300 PSI to drop the pressure and complete the refrigeration cycle, and the low pressure switch, which basically doesn't allow the compressor clutch to run if the system is low/empty of refrigerant (turns it off under about 10-20 PSI). My guess is, if he couldn't get the refrigerant back in the system, either his a/c service machine was malfunctioning, or he didn't know how to use it... I've seen a LOT of both on the field... I'm sorry to say there is a lot of people working on automotive A/c out there that don't really know what they're doing, but sincerely believe they do... Short of giving you a definite answer, i'd get a second opinion on that before spending any good money on a compressor (which are usually pretty pricey)

From what you're describing, it sounds like the AC system needs a refrigerant charge.
Many car owners are doing their own AC
charge by purchasing a re-charge kit at the local auto parts store. A small gauge is also available (looks like a tire gauge) that attaches to the low side of the AC system, that gives you a reading of the system's charge.
The low side of the system is the larger metal hose line coming from the compressor. It has a fitting and cap on it. The high side is the smaller diameter metal hose.

Try disconnecting the battery for a minute or so and reconnect it. Believe it or not this has worked for me numerous times. If this doesn't work then disconnect the switch on the accumulator. The accumulator is located in the low side (big) hose near the firewall on the passenger side of truck. Using a paperclip jump the two wires (harness side) together with engine running and a/c on. If compressor kicks on when jumped either it's low on freon or the switch is bad. Hope this is helpful.

Hi there. Sounds like you need your A/C refrigerant re-charged. In general an A/C system will loose at least 10% of their effectiveness each year through loss of refrigerant and if there is a small undetected leak or no refrigerant in the system, the compressor is simply not going to ‘kick-in’. Best thing to do is have a professional A/C Centre recharge the system, check for leaks and monitor the operating pressures in the A/C system thus checking the effectiveness of the your A/C compressor. Hope this helps, Scottech

generally speaking if the a/c clutch doesn't kick in it's because of either no voltage or low refrigerant. you can waste the money and just recharge the system and replace the a/c clutch, however it's been my expeirience that often times the compressor goes bad and that money was needlessly spent. this time of year the price to fix the system is far cheaper than the begining of the spring take the vehicle to a qualified a/c tech and your problem will cease. if you have no voltage that means the a/c clutch relay is bad. make sure all relays and fuses are good. the relays are clearly marked. quick to find out is to switch the cooling fan relay with the clutch relay if the a/c kicks in you know that relay was bad. hope this helps