My air conditioner in my 95 Dodge Intrepid does not does not work even after recharging with refrigerant. Could it be the AC pressure transducer? If I replace it should I depressurize refrigerant system lines first? The AC compressor clutch mechanism does not rotate using the cabin switch. I tested the AC compressor clutch mechanism, and it works with a jumper wire. Could it also be the Air conditioning expansion valve? How can I tell which is the problem?

if you take to a AC repair shop they will do all the checks you need and if required top up the refrigerant , not at all costly and they have the correct equipment for the job , not really a thing for the home mechanic

it sounds like either you a/c compressor isnt working properly of you have a leak in the a/c system causing a loss of refrigerant. a way to see if your compressor is working properly is to open te hood and have someone sit in the car with the key on engine off and have them push the a/c button on and off. you should hear a definate click coming from the compressor. if you dont hear a click it would be because your compressor failed or there isnt enough refrigerant in the system for the compressor to come on. there are two pressure switches a low pressure switch that tells the compressor to come on once the pressure drops to a certain point. and a high pressure that tells the compressor to shut off once it reaches a certain pressure. you can try recharging the system yourself by going to your local auto parts store and buying a recharge kit. this may solve the problem but if it leaked off once, chances are its going to do it again so i would take it to a shop and have them test it for leaks.

large leak in system, faulty low pressure switch, a/c clutch faulty, a/c compressor faulty, system clogged, fuse blown, wiring faulty. orifice tube clogged, too much air in system. read more here:

http://www.aa1car.com/air_conditioning.htm

The Low Pressure Side connector will be smaller than the High Pressure Side connector so the refill hose will fit properly only on the Low Pressure Side.
Read more: How to Recharge Air Conditioning with Freon in a Dodge Ram | eHow.com http://www.ehow.com/how_4484569_recharge-air-conditioning-freon-dodge.html#ixzz0uLXJnwvE

sounds to me u need to have it recharrged

HI. Here is a complete check list that will help you trouble shot thsi issue. You will find the problem in one or more of these areas stated below.

1. Check Drive Belts - The air conditioner utilizes a drive belt that supplies power to rotate the compressor, which is basically a refrigerant pump. If the belt fails the compressor has nothing to drive it, inspect and replace as needed to restore operation. If belt is intact proceed to the next step.

2. Check for Compressor Clutch Engagement - Turn the air conditioner to the "on" position and set controls to the coldest setting. Start the engine and allow to idle. Then open the hood and inspect the clutch at the front of the compressor, is it turning? "Engaged" if so, the system has enough refrigerant to activate. If the system is low on refrigerant it will not work properly. In this case an air conditioner recharge kit is needed to recharge the system. If the system is low on refrigerant it could cycle on and off, making a ticking noise. If the compressor clutch is not turning proceed to next step.

3. Inspect for Refrigerant Leaks - If the system has a large leak and no refrigerant remains it will not activate. First test system for a static pressure charge, with the engine off attach an ac gauge to the low side pressure port and check the state of charge. Depending on outside temperature there should be between 50 psi and 80 psi. (Cool and warm). A refrigerant leak detector is needed to inspect for leak, but if you do not have a leak detector there is an alternative method. The air conditioner system is designed to run with oil suspended in the refrigerant to lubricate the system. Check for oily residue outside the system by inspecting all hoses, compressor, condenser, evaporator or receiver drier and replace any component that has failed.

4. Inspect Fuses - Check under dash panel and under hood power distribution center. Replace failed fuses as needed, recheck system. If the new fuse fails when reinstalled a short circuit is present and requires diagnosing with a wiring schematic, follow circuits to locate short, repair as needed and recheck system.

5. Check Temperature Control Vents - The vents inside your car are controlled by a cable, electrical servo or vacuum servo. If the temperature blend door is not functioning properly it will cause warm air from the heater to exit the vents. To check this start the car and allow the engine idle, next turn the blower motor speed on low, switch the temperature control from warm to cold while your ear is close to the vents. You should hear the door move inside the heater box as it swings from open to close. If not, insect for a vacuum leak or a shorted motor in the servo, repair the leak or replace the servo motor.

If the blower works but its just not blowing cold air, its possible to recharge the AC system yourself. Most auto parts stores carry AC recharge kits. Instructions to recharge the AC are belowl

RECHARGING AC SYSTEM

1.Turn the truck on and turn AC on HIGH
2.Locate the low side AC line (will have a valve and cap similar to the cap on a tire)
3.Insert the oil or R-134A can to the hose (Do not turn the screw to puncture the can yet)
4.Insert the other end of the refill hose to the low side valve
5.Puncture the R-134A can with the screw on the refill hose
6.You should feel the system suction the refrigerant out of the can
7.Check for frost on the AC lines and the air blowing inside the truck
8.If frost develops and the air is cold, you've successfully recharged the system and disconnect the refill hose. DO NOT ADD MORE REFRIGERANT...overcharging the system will damage your compressor and will be less effective

Best of luck and enjoy your vacation.
Greg

Hopefully this answers your question and you're able to get your AC working again. Best of luck.

How did you check your pressure? A proper way to charge a/c is to evacuate the system, which is removing all the refrigerant, and vacuum it down to remove all moisture. Then recharge with the proper amount of refrigerant.
Or, your drain for the evaporator can be plugged. Have it checked first.

recharge ac, means pressure is low,

Check the fuses/relay for the compressor. If good, bypass the pressure switch. If the compressor comes on, there is too little internal pressure. Have the system evacuated and recharged. If the compressor does not come on, it could be bad.