Question about 2001 Nissan Pathfinder
System has been recharged to 1.88lbs, I have replaced the a/c relay and the hi/low pressure shut off switch. I can hot wire the compressor and it works great. I have constant power to the number 1 and 3 terminal on the relay block and good ground. but I still cannot get the compressor to work normally. any suggestions?
There is a sensor in the evaporator box, I believe its a cabin temp sensor. Need to bypass or replace it.
Posted on Apr 22, 2014
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Posted on Jan 02, 2017
The low pressure switch in an A/C system cannot be manually "switched" on or off.
most A/C systems have 2 switches. Both of these switches are "switched" by the pressure of the freon in the system.
One is located on the high side of the system, and the other is on the low side of the system. The one located on the high side is a normally closed switch that opens the A/C clutch circuit and shuts the compressor off when the high side pressure gets dangerously high - usually around 350 - 400 PSI. This keeps you from having an explosion in the event that the hoses become restricted for any number of possible reasons.
The low pressure switch opens the A/C clutch circuit and shuts the compressor off when there is not enough pressure on the low side of the system to safely operate the system. usually somewhere around 20 PSI. The compressor is oiled by oil circulating along with the freon in the system. If the freon leaks out, the pressure drops and the oil cannot circulate because there is not enough freon to push it through the system. So the low pressure switch shuts the compressor off to keep the compressor from blowing up due to oil starvation.
Failure of these switches is very rare. Almost every one that I have replaced was not because the switch didn't switch, but because it was leaking freon.
If your low pressure switch is keeping your A/C compressor from running, it is most likely that the system is either out of freon (due to a leak somewhere in the system) or because it is unplugged.
Your Nissan is equipped with a "Dual Pressure" switch. it does the job of both switches by opening under extremely high pressure as well as extremely low pressure conditions. it is located beween the front grill and the A/C condensor near the Accumulator just to the right (as you are facing the front of the car) of the right headlamp area. See picture. To determine if this switch is functioning properly, you must hook-up an A/C pressure manifold gauge (to find out what the actual system pressure is) and use a volt/ohm meter to determine if the switch is opening and closing under the correct pressures.
Posted on Oct 12, 2009
SOURCE: I have a 2003 Nissan
105 psi? If so that is way to hi...especially for a mid-sized car. You ideally want you pressure to be between 40-50 psi. If you pressure is that hi you might have blown the pressure valve on you compressor, which is not a part that is sold seperately. You should take your car to your local Pep Boys and have them run a A/C diagnostic which runs around $45 to give you an better idea. If you don't know what you're doinf the A/C system is not something you want to play a guessing game with. Especially since it's illegal to work on it without the proper tools and licenses.
Posted on Dec 08, 2010
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