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Please help. A/C issue

weirdooh on Thu July 21, 2011 10:12 AM User is offline

Year: 2001
Make: Nissan
Model: Sentra
Engine Size: 2.0
Refrigerant Type: r134
Ambient Temp: 82

I have a 2001 sentra SE 2.0, 177K on the odometer

AC wasn't blowing very cold. I charged the AC. was at 30 I charged it up to 45 @ 82 degrees ambient temperature.

Relays are good. Fuses are good. Condenser fan and radiator fan are working and compressor clutch engages. Car does not overheat.

The AC works great on start up then stops once it reaches operating temperature. The air cycles on for 2 seconds every 30 seconds or so then quits.

If I soak the condenser with the garden hose it will run perfect no matter what the temperature Until the water in the fins evaporates.

It driving me crazy and it's freakin' hot here!

bohica2xo on Thu July 21, 2011 11:19 AM User is offline

Need to know what the high side pressures are when it cycles off.

It is not possible to diagnose the system without both pressure readings.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

DaveMcKenz on Fri July 22, 2011 9:54 PM User is offline

Best advice is to evacuate and recharge to factory specified refrigerant amount. Be sure to pump down to full vacuum for at least one hour. Check for leaks (UV dye, electronic detector) and repair/replace defective components. Report hi/lo pressures at standard operating conditions.
Good luck,

weirdooh on Tue July 26, 2011 9:41 PM User is offline

Got the manifold guages. Ambient temperature about 80. low side 35 psi. High side 250. The longer I let it run the higher the pressure on the high side only. low side stays at 35 psi. Got up to 350 after about 10 minutes of running in the shade. On hotter days tha ac compressor and fans shut off (driving or sitting still) and it blows lovely warm air. Any ideas? Thanks for your time.

JJM on Tue July 26, 2011 10:22 PM User is offline

Problem is your cooling fans are likely not getting up to speed. Does the A/C work good at continuous highway speeds? If so, it's a fan issue. Fans probably are not kicking into high speed. If not, your compressor is likely on its way out and extended itself all over your condenser.

You've got 3 fan relays for the 2 fans, all of them need to be working, and power needs to be coming from the 2 40A fuses and 1 10A fuse.


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weirdooh on Tue July 26, 2011 11:27 PM User is offline

I can hear the fans go from low to hi and all the relays seem good. swapped them out in a clockwise pattern. Same effect. It kicks off sitting still and while driving.

bigJOE671 on Thu July 28, 2011 11:57 PM User is offline

94' Civic Si HB

bigJOE671 on Fri July 29, 2011 12:01 AM User is offline

I almost have the same ac only works when the car is at a constant speed 55+mph.

My problem is that the fan was working but it wasn't up to speed. It would only show that it spins but i could stop it with my hand. That's how weak my fan motor is now.

Did the thing with the water spraying on the condensor and the ac started blowing cool air at idle.

94' Civic Si HB

Edited: Fri July 29, 2011 at 12:02 AM by bigJOE671

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