I have a 1993 Ford Tempo GL 2.3L automatic. I want to know how do I recharge the AC unit. I know it's a low and high side for vehicle but I just see one side to put something in it

On most models you would need to jumper the low pressure switch while you are recharging the system. There should be a low pressure switch on the low side line and a high pressure switch on the high side or on the compressor.

There are many ways to recharge an ac system but to do it correctly is a bit more in-depth. You can read the ac tag under the hood of your vehicle and purchase a can of coolant then hook it up to the low pressure side as shown on the can. Start the engine and follow their instructions. If you have a leak you should add UV dye to the system to locate the leak then repair as needed. To recharge system I recommend purging the system to a proper catchment contaner, recycle the refrigerant as required. Put an ac manifold on the high and low ports of the ac system (they are sized to only fit in the proper location) then attach a moisture removing vacuum pump create a vacuum in the system of 20lbs at sea level or more. Close the high and low pressure valves and disconnect the vacuum pump connect the refrigerant to the vacuum line, start the vehicle, turn on the ac (fan on low) add the amount of refrigerant that your vehicle tag requires.

There are 2 switches that control the ac compressor operation . One is to stop the compressor destruction from an over full system or a high head pressure from the condenser fan not working . When the system pressure is exceeded then the ac compressor switches off . The other is a low pressure switch that shuts the ac compressor when there is too little gas . Unless you have checked the system for leaks ( why else would you be adding gas) then if you have just recharged the system it is more than likely that there is too much gas . Best advice is to go to an accredited ac specialist and have the system checked for leaks and the correct gas pressure/ volume

First check the fluid,but don't overfill if you add some. Problem is that the ****** should be hot to check the level accuratly and that means driving it a ways.

AC work is very complicated and expensive. Being a 1993 you have to ask youreself if iyou REALLY want the AC fixed. Chances are that it is low on refrigerant. The AC system is like a tire, if it goes low - there's a leak. If the AC system has a leak- Thats where it can get costly. The leak has to be repaired before recharging..Thats federal EPA law...But its not as easy to just repair the leak...depending what kind of leak it is ( a seal, a pin hole or a large hole in a line or hose) Once the system is opened up and exposed to the atmosphere there are a few key components that will HAVE to be replaced. I've repaired AC systems that had leaks that the repairs ran easily in the 6 to 8 HUNDRED dollars. On the other hand it could still have a charge but be an electrical problem to where the AC components are not switching on. My best advise would be for you go to a reputable Repair shop that services AC systems,,,get a diagnosis and estimate of what it will cost to get it working and then ask your self how bad do you want the ac to work. The shop I used to work at would do an AC diagnosis for aroud 70 to 80 dollars that would include up to 1lb of refrigerant. I hope this helps.

should be in front of the radiator unter the hood

I just installed an aftermarket stereo in my daughters 93 Ford Tempo.

I have seen others post on-line and they were incorrect for my 93, the one I found my have been for a different year. THere are 2 wiring harnesses on the stock/OEM unit, one for the speakers (#1) the other for the power (#2). Here is what I found:

Harness #2
Constant 12 v+ : Green/Yellow
Switched 12v+: Yellow Black
Ground: Black/Yellow
Illumination: Blue/Red
Unused: Orange/Black

Harness #1
Left Front (+): Orange/Green
Left Front(-): Blue/White
Right Front(+): White/Green
Right Front(-): Green/Orange
Left Rear(+): Pink/Green
Left Rear(-): Tan(Brown)/Yellow
Right Rear(+): Pink/Blue
Right Rear(-): Brown/Pink

Hope this helps.

maybe on the dryer. if your only going to put R134 in without sucking any out. then only put it in the high side with the car not running.

should be in the line itself, larger hose for low side and small line for high side also hot side, look in the larger line for the fitting will look like a tire inflater valve

reclarification. I will need to know what type of vehicle it is. Secondly, do you have the equipment to evacuate and then recharge the a/c system?

The system must be pumped down to 20 inches of vacumn for at least 1 hour before recharging the system.

This operation is highly regulated in most states now because of EPA issues.
Bill