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1996 Infiniti I30 AC

ldpfeifer on Tue July 07, 2015 2:51 PM User is offline

Year: 1996
Make: Infiniti
Model: I30
Engine Size: 3.0
Refrigerant Type: r134a
Ambient Temp: 96
Pressure Low: 70
Pressure High: 175
Country of Origin: United States

We bought this car used from California. The A/C was weak at best when we got it so I added a pound of 134 and it was fine, knowing it was going to need a complete recharge at some point.
I bought a new filter dryer, replaced orings, tighten unions and evaced the system a couple of times along the way to make sure the air was out of the system. I ran the vac pump for over an hour and let it sit for about as long looking for leaks. I added 2 12OZ cans of r134A to the system as it takes right at 24 OZ according to the decal. The compressor never stopped or cycled at all and the low side pressure was about 45 after the first can and right at 70 with the second can. The high side slowly went up too, to about 175. It is blowing cool to somewhat cold but not great. Compressor going out? Expansion valve? Any ideas here as this does have the auto climate control system as that is the only way the car came from the factory.
Thanks in advance for any help.
Sweating in WA

Dougflas on Tue July 07, 2015 3:34 PM User is offline

what are the pressures with the engine speed at 1500 rpm? That vehicle has a self test mode. Isuggest you purchase the Mitchell CD on that vehicle.

Edited: Tue July 07, 2015 at 3:45 PM by Dougflas

ldpfeifer on Tue July 07, 2015 9:48 PM User is offline

I will check that and get back to you. The funny thing is the low side pressure just kept increasing to where it is at. The compressor never cycled and it never ever drew down, it only kept going up in pressure on the low side.........

mk378 on Tue July 07, 2015 10:16 PM User is offline

I think that STV's were used on some of those models. These restrict the flow into the compressor when the low side goes below 25 to prevent over-cooling. By design, the compressor will not cycle, for that "luxury car" feel. If you're measuring pressure before the valve it may be not opening. Or like you said, the compressor is just tired.

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