High side pressure is 200 and low side is 30-40. The low side line is warm all the way as far as I can reach. The high side is blistering hot to touch. Compressor is running and starts and stops when ac is turned on and off just as I would expect. Could this be the exansion valve? Please help!
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Re: Durango AC Wont Cool
Yes,it probably is & cheapest way to start. 200 isn't the end of the world,150 is normal. Depending on ambient temp that could be fine. The dryer could be restricted as well. Last possibility is the r134 is low or overcharged.
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Typically the the low pressure/suction line is a bigger pipe/tube, as far as location it depends on the car. The bigger AC line is almost 99 percent of the low pressure. Usually on the cap it will say most of the times to there is a different hydraulic fitting for the low and high side. Most cars I have seen have a little tag that will say suction or low pressure line, and or discharge high pressure.
If you are re charging the gas, always use the low pressure side of the system.
HIGH PRESSURE CUTOFF SWITCH LOCATED ON AC COMPRESSOR DISCHARGE LINE LEADING TO THE CONDENSOR.THE HIGH PRESSURE CUTOFF SWITCH WILL CUT OFF THE AC COMPRESSOR IF SYSTEM PRESSURE RISES TO HIGH CAUSED BY RESTRICTION IN THE REFRIGERANT CIRCUIT OR OVERHEATED CONDENSOR.MAKE SURE COOLING FAN IS RUNNING WHEN THE AC SWITCH IS ON.THE COOLING FAN KEEP CONDENSOR COOL, IF COOLING FAN DONT RUN.YOUR AC WILL STOP BLOWING COLD AIR.HAVE THE REFRIGERANT SYSTEM CHECK OUT.MAKE SURE YOUR LOW SIDE PRESSURE IS 10 - 37 PSI. THE HIGH SIDE PRESSURE SHOULD BE 112 - 210 PSI. CHECK THE AC COMPRESSOR CLUTCH FUSE AND RELAY.
FOLLOW THE REFRIGERANT LINE LEADING FROM AC COMPRESSOR TO EVAPORATOR TO THE BACK FIREWALL LOOK FOR REFRIGERANT LINE WITH BLACK OR BLUE CAP THATS LOW PRESSURE SUCTION SIDE..WHEN HANDLING REFRIGERANT WEAR SAFETY GOGGLES TO KEEP REFRIGERANT GETTING INTO YOUR EYES.WHICH CAN CAUSE BLINDNESS OR DAMAGE EYES.YOU NEED A LOW AND HIGH PRESSURE GAUGE.OR MANIFOLD GAUGE SET.LOW SIDE PRESSURE SHOULD BE 28 PSI AND HIGH SIDE SHOULD BE 200 - 220 PSI.
best diagnostic method is dual head gauges. balanced pressure between low and high side in the off position is aroung 90 lbs. running low pressure is 20-40 lbs and high pressure 160-200, is the compressior not coming on? does it stay on, or click on and off. either might mean the freon level is low. try unplugging the low pressure switch on the low side supply line and shorting the pigtail wires together with a paper clip. does the compressor stay on now? if so and the air is warm or cool, freon is low. if the air is cold that switch is bad. if compressor still won't come on the list of possibilities grows longer: compressor, comp fan clutch, AC relay, restriction at several places... repair shop time...
42-45 low side and 200 high side would be nice but the heat being like it is look far 250 to275 and that is pushing it...if the low side service port is like 2 feet away from high side(whitch i think it is on this year) your low side could reach about 52 ,so this wold be normal
check the space between the ports, it is common to have both fittings on the same line if and only if the orifice tube is located between them because thats what seperates the low pressure side from the high pressure side, the high pressure side will be warm to hot when the a/c is running, once the hot liquid hits the orifice tube it turns into a cool vapor, so if you feel one side is hot and one side is cool then the orifice tube is whats between them and it is true that the low and high pressure sides can be on the same line.