A/C Problems Pressure Switch - Nissan Forums : Nissan Forum
 
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post #1 of 6 Old 05-02-2012, 05:48 PM Thread Starter
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A/C Problems Pressure Switch

Hey guys

The A/C was blowing 85-90 F . Charged it with 2 cans to spec (1.1Lb) and its blew in the mid 40's to 50's and it was 80F out.

Went it engine bay and saw and heard that there was pressure/refrigerant leaking by the pressure switch, the switch it on the passenger side right under the send/return lines connected to the evaporator.


I think I can get the switch leak fixed with a new o ring.

But what controls the compressor clutch? Clutch never comes on by itself, I have to jump 12v to it to make the clutch engage.


DamianJP

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post #2 of 6 Old 05-04-2012, 02:50 AM Thread Starter
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Can anyone help me trouble shoot the A/C system please? I know it complex but lets start with the pressure switch and thermo control amp , i need to test them some how. I have a ESM and need to be pointed in the right direction.

Like i said , the compressor's clutch never comes on, I have to jump 12v to it. Also the system has no freon in it , the pressure switch was taken out to check oring.

What would make the compressor never kick on? Fans in front work.


Thanks,
DamianJP
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post #3 of 6 Old 05-04-2012, 03:06 AM
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The compressor isnt turning on because the pressure is low on the freon. Fix the leak refill the system and you should be good to go. Dont try bypassing anything you might do more damage.



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post #4 of 6 Old 05-04-2012, 04:57 AM
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The pressure switch is just that...it senses pressure. It will stop the compressor clutch from engaging if the specified pressure is not in the system.


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post #5 of 6 Old 05-05-2012, 10:34 AM Thread Starter
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Thanks guys !

Can I test my old pressure sensor/switch by Ohms or something else?
If I can save the $38 that would be cool.

Like I said it was leaking out of the pressure sensor/switch area and it had a black o ring not a green o ring. Also I added 2 cans of freon and the gauge almost read full charge but couldn't because of the leak. The compressor never came on untill the brief 12v jump.

Does that sound like the pressure sensor/switch is shot or did the leak give a false reading and the sensor/switch is fine?



This 4 banger 2.5 SL is really nice and keeps surprising me. Solid car , nice creature comforts and can get low 30's MPG with tire PSI/Alignment %100 , proper plugs/gap , rely on coasting alot and braking the least. This is the reason I bought it for my Dad, I wanted him to have something nice and reliable to drive. Thank you guys for helping me fix it for Dad.


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post #6 of 6 Old 08-14-2013, 09:03 AM
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Same problem may be fixed!
96 Altima
I hadn't changed out my antifreeze in several years...
Completely flushed out my coolant, then flushed out with a radiator cleaner and flushed out again with clean water until it ran out clear... All flushes with the heat on hot! Then filled with 50/50 antifreeze mix as is recommended.

Think about it... The computer is telling the AC to shut off because it senses that the engine is too hot to put any more strain on itself!

Now I have Cold AC even in 105 degree temperatures outside!

The Nissan experts said I would have to replace the compressor, etc.

Good Luck!
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