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27-11-2020, 12:53 PM | #1 | ||
Starter Motor
Join Date: Oct 2020
Posts: 2
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Hi All
I have an issue with my AC, which it is not doing a good job on hot days(above 30c days) On a normal day(outside temperature less than 30), I can hear AC clutch cycles on constant time periods and AC is cold enough, but when the outside temperature is above 30, I can hear the clutch cycles frequently than a normal day, and AC is not very cold. I have tested the system using the manifold gauge and below are the readings. Car not started - Static system pressure Outside temperature - 21c AC High gauge - 65psi AC Low gauge - 70psi Pressure gauge - static pressure reading - image When I reading about the static pressure on this forum, I found most people saying static pressure should be equal on both sides, but mine seems to be 5-10 psi less on the high side. Then I started my car turn on the AC and I have recorded the movement of the gauges you will find it in the below video. AC pressure test video When the AC clutch engaged, the high side goes a maximum of 110 - 120 psi only and I can hear the AC clutch turns off. Also noticed that the indicator of the gauge is a bit wobbly when it reaches 110psi. I don't think the gauge is faulty as I have connected it to another car of my fried and it seems to have no issues. I don't have much knowledge about car ac systems, but every form i read people mention the high side should be at least 150 psi but mines cut off near 110. Is it a problem with my high-pressure switch? or im low or high on R134a Any diagnostic advice much appreciated. |
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06-07-2021, 04:09 PM | #2 | ||
Lukeyson
Join Date: Mar 2005
Location: Maitland, NSW
Posts: 2,584
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Can you see this link? It has some handy troubleshooting steps regarding the high pressure and low pressure switches. Given I am 8 months late in replying I assume you have solved your problem by now?
http://fordforums.com.au/wsmpub/wq95/412-00.html Luke
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