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Old 07-17-2011, 01:38 PM   Thread Starter #1
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Default Optimal A/C Pressure Readings

Guys, what are the appropriate A/C pressure readings for the 6th gen? I have a manifold guage set, but I really don't know when the pressure readings are supposed to be either too low or too high on the suction and discharge sides of the compressor. My Max is 06.
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Old 07-17-2011, 03:57 PM   #2
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Default Re: Optimal A/C Pressure Readings

on the high pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28kg/cm ,398psi ) or below about 120kPa(1.22kg/cm ,17.4psi )
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Old 07-17-2011, 06:07 PM   Thread Starter #3
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Default Re: Optimal A/C Pressure Readings

Originally Posted by NiZMo1o1 View Post
on the high pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28kg/cm ,398psi ) or below about 120kPa(1.22kg/cm ,17.4psi )
Thanks pal. But these figures are outrageous. I've since found out what I was looking for in the Mastercool (guage set) manual as well as Nissan's Electronic Service Manual (ESM). Mastercool for instance has something like this
R134a TEMPERATURE PRESSURE CHART
Ambient Temp
(F) Low Side Gauge High Side Gauge
65 25-35 psi 135-155 psi
70 35-40 psi 145-160 psi
75 35-45 psi 150-170 psi
80 40-50 psi 175-210 psi
85 45-55 psi 225-250 psi
90 45-55 psi 250-270 psi
95 50-55 psi 275-300 psi
100 50-55 psi 315-325 psi
105 50-55 psi 340-345 psi
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Old 07-17-2011, 06:39 PM   #4
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Default Re: Optimal A/C Pressure Readings

Originally Posted by Costee View Post
Thanks pal. But these figures are outrageous. I've since found out what I was looking for in the Mastercool (guage set) manual as well as Nissan's Electronic Service Manual (ESM). Mastercool for instance has something like this
R134a TEMPERATURE PRESSURE CHART
Ambient Temp
(F) Low Side Gauge High Side Gauge
65 25-35 psi 135-155 psi
70 35-40 psi 145-160 psi
75 35-45 psi 150-170 psi
80 40-50 psi 175-210 psi
85 45-55 psi 225-250 psi
90 45-55 psi 250-270 psi
95 50-55 psi 275-300 psi
100 50-55 psi 315-325 psi
105 50-55 psi 340-345 psi

Mines was taken from the FSM from Nissan, I dont do A/C work and thats not my department, I copy and paste from word for word, Again I dont always go by the book.
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Old 07-18-2011, 05:11 AM   Thread Starter #5
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Default Re: Optimal A/C Pressure Readings

Originally Posted by NiZMo1o1 View Post
Mines was taken from the FSM from Nissan, I dont do A/C work and thats not my department, I copy and paste from word for word, Again I dont always go by the book.
Yeah, got your drift. These figures are determined by the ambient temperature; it seemed your took out the highest figure in the chart. lol. Thanks for response nonetheless.
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