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Galant ac pressure question
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Briangillen
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Jun 22, 2014, 5:59 AM
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Galant ac pressure question
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Any advice with this ac problem on my 2004 mitsubishi galant would be appreciated. The high side pressure will hold steady at 150 but slowly drop to 100. Then the compressor will kick in and bring it back up to 150. (Low side holds steady around 45. Outside temp is 90.) But it never blows cold.
Thanks in advance for the help. Brian
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Hammer Time
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Jun 22, 2014, 6:06 AM
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Re: Galant ac pressure question
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Exactly how much refrigerant is in the system?
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Briangillen
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Jun 22, 2014, 6:29 AM
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Re: Galant ac pressure question
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I put 22 oz. in.
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Hammer Time
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Jun 22, 2014, 6:31 AM
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Year and engine size?
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Briangillen
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Jun 22, 2014, 6:40 AM
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It is a 2004 with a 2.4l engine.
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Hammer Time
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Jun 22, 2014, 7:08 AM
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OK, since you have the correct charge we can analyze the pressure problem. What it's telling me is that there is a restriction in the system. You can verify this by feeling the temp of the liquid line at idle. It should be warm to the touch but if you feel no heat at all, that tells you there is no refrigerant moving. What I usually do in that case is replace the dryer and expansion valve and that usually resolves the issue.
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Briangillen
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Jun 22, 2014, 7:38 AM
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Yeah, I thought there might be a restriction too. The expansion valve and drier were replaced as I have tried to find a solution to this problem. So I guess that only leaves the evaporator or the line from the compressor??? Is there any way to verify which is the problem? Thanks!
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Hammer Time
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Jun 22, 2014, 7:43 AM
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I have never seen an evaporator do this, although I have seen some hoses do that, sometimes a condenser.
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Discretesignals
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Jun 22, 2014, 8:03 AM
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Did you evacuate it before you recharged it?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Briangillen
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Jun 22, 2014, 1:38 PM
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Yeah it was evacuated before the expansion valve was installed.
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Discretesignals
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Jun 22, 2014, 1:51 PM
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Was it evacuated after you installed the valve before you recharged it?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Briangillen
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Jun 22, 2014, 2:10 PM
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No, not after the expansion valve was replaced.
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Discretesignals
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Jun 22, 2014, 2:24 PM
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That might be your problem then. Evacuation has to be done before you recharge the system after all repairs are made to the system. If you don't evacuate, you'll have a bunch of air and moisture in the system. The moisture will ice up the expansion valve and the air will overheat the ac compressor.
You need to evacuate the system for at least 40 minutes using a good vacuum pump. The system should hold vacuum with the manifold valves closed.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jun 22, 2014, 2:24 PM)
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Briangillen
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Jun 22, 2014, 4:40 PM
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Okay, thanks. I going to try it and I'll let you all know how I make out. Brian
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Briangillen
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Jun 25, 2014, 12:55 AM
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One last question before I get started. I couldn't find the exact amount of oil to add, I've heard rule of thumb is one ounce per component replaced. Anyone know the recommended amount to add? Thanks!
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Hammer Time
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Jun 25, 2014, 1:06 AM
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That depends on which components.
What did you change?
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Briangillen
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Jun 25, 2014, 1:46 AM
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I just did the condenser and the dryer.
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Hammer Time
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Jun 25, 2014, 4:33 AM
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I would put about 3 ounces.
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Briangillen
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Jun 29, 2014, 12:56 PM
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Ok, changed the condenser and the drier. While I was at it I used some flush on the lines. (I disconnected them so I would send flush through the expansion valve or the compressor.) then I evacuated and recharged with 19 oz. Sadly, still no cold air. Pressure now 55/110. So frustrating!
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Hammer Time
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Jun 29, 2014, 12:58 PM
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If that is your idle pressures, what are they at 2000RPM?
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