I am working on a 2000 nissan maxima and i have replaced the compressor and refilled the freon and oil and the presure relief valve keeps poping open with only one can of freon instaled it seems likethere is some kind of restriction

There is a valve that stops hot coolant from entering the heater box. It is probably stuck open. murf427

As for how much freon, you'll get the coldest air letting them "pump" it to a pure "vacuum" and then fill it will 100% Freon (you never want to "top it off" ...which many do and somehow get away with it). I don't understand what you mean about the A/C compressor though. If it IS misbehaving most likely the sensor that tells it to pop on and off is likely worn out. (I don't have my Nissan info handy so that's as far as I can take you ...today anyway!) :=) Good luck.

Heres the problem, this car holds a total max amount of 25oz of feron (1lb 9oz). you dont know how much is in the system now and without gauges to read the highside and lowside you wont know how much to add, they sell the gauge with the yellow and green and red display but its not accurate. you just dont keep adding until its cold because will will damage the system. the right way is to have a certified ac tech to check and charge the system. there could be a small leak somewhere. to recarge the system correctly it must be evacuated and then vaccumed down then depending of how low the system is you add the right amount of oil. then you add a dye and the correct amount of freon to the system. the dye thats added is used to find the leak. when the system gets warm again there is a blue light and yellow glasses used to located the dye which will be where the leak is, after recharging and testing you then use a freon snifer to check all components and hoses for leaks. if this is something you cant afford at this time then you can try to recharge yourself but take note that just because the compressor is not on means its low on gas. make sure to get the little gauge the sell and read the directions so you dont overcharge the system. also dont use the sealer stuff they sell, only buy the freon with oil and dye in it and dont vercharge, watch the gauge they give you, you will be charging from the lowside which is the small valve, the hose will not fit on the highside, good day.

It can leak out over time through what are called Shrader Valves. They are replacable but they can and do leak. They are located where you put the freon in at the high side and low side ports. It can also leak out from the A/C compressor if the seals have failed. There are mane areas it can leak out from but the Shrader Valves are the most common places. AS LONG AS YOU DONT TURN THE A/C ON, YOU CAN'T CAUSE ANY DAMAGE. IF YOU TRY TO RUN THE A/C WITH A LOW CHARGE YOU WILL BURN UP THE A/C COMPRESSOR AND CONTAMINATE YOUR A/C SYSTEM AND WILL HAVE TO REPLACE A LOT MORE STUFF WHEN YOU DO GET IT FIXED. THE FREON IT WHAT MOVES THE LUBRICATING OIL THROUGH THE SYSTEM. SO JUST LEAVE THE A/C OFF UNTILL YOU IDENTIFY THE LEAK AND REPAIR IT.

seems like you lost your ac charge or you have a bad ac compressor or both. Can be repaired by you with a little ac knowledge 200-300 dollars. compressor dryer oil freon About 700-900 dollars in a shop.Good Luck!!!

Yes it does have a pressure relief valve so u don't blow the line or canister.Hope this helps clear your mind.

You say the pressures are good?The low side on this vehicle need to be lower than most,because it has a expansion valve,it needs to be around 30 psi,to about 35,if it is not,and the freon level is correct,then the expansion valve is bad.If this was helpful,please rate,thank you.

Oh my!! I'm guessing the "oil pressure relief valve" is stuck open. Does the motor sound OK no knocking or ticking? The "oil pressure relief valve" is built into the oil pump.

Cadillac 1994 DeVille

Check, if the oil level is low, top off.
If the oil level was ok then you can replace the oil sending unit.

2000 maxima is filled with R134, not freon. You don't need retro fit kit. Get couple of cans of R134 and pump it into the low side valve /small fiting, while A/C compressor is engaged. If your compressor is not coming on, jump the low side pressure switch to make the compressor come on and than the R134 will get sucked in to your system through the low side line. The proper way to do this is to put a/c system under vaccum for 15 minutes at least and watch for leak/gauges coming/loosing vaccum. Than pump R134 into the HIGH side valve with engine OFF.