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2004 Mitsubishi Lancer AC problem
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sidgallegos
New User
Jun 22, 2014, 3:41 PM
Post #1 of 13
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2004 Mitsubishi Lancer AC problem
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Greetings,
I have an "04 Lancer OZ Rally Sport 2.0L with 125,000 miles. My problem is this:
About a year ago, a so called mechanic said that the reason my ac was blowing hot air intermittingly was because my whole fan assy needed to replaced. I didn't that and it didn't fix the problem.
What's happening is when I turn on the car, then I turn on the AC and it blows cold air. After a while it starts blowing hot air and then after a few minutes it starts to blow cold air again. This cycle continues throughout the day and at some point I just roll down the window because it just blows hot air. Funny thing though, when I turn off the car and then start it up again, it blows cold air.
So, this is my problem and I hope I can fix it myself. I just spent a fortune on a fuel pump for my truck and really cant afford a mechanic right now. Thanks !
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 22, 2014, 4:09 PM
Post #2 of 13
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Re: 2004 Mitsubishi Lancer AC problem
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Is the compressor engaged when it is blowing hot?
You may need to monitor system pressures to see what is going on when the problem is occurring.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Tom Greenleaf
Ultimate Carjunky
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Jun 22, 2014, 4:28 PM
Post #3 of 13
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Re: 2004 Mitsubishi Lancer AC problem
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sid: Do you see icy lines underhood? Does it make a huge puddle when you park it after not working and is airflow out vents strong? That could be evaporator icing if so.
Still need to know if compressor is engaged as DS just said as it might be shutting down for assorted reasons,
T
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Hammer Time
Ultimate Carjunky
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Jun 22, 2014, 10:27 PM
Post #4 of 13
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Re: 2004 Mitsubishi Lancer AC problem
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If the evap was actually icing, you would see a dramatic reduction in air flow, not so much temp change.
Do as DS advised
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Jun 22, 2014, 11:07 PM
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Re: 2004 Mitsubishi Lancer AC problem
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Disagree - have witnessed icing (seen on lines) and airflow fine but outputs rose. Low pressure return compressor shuts off and melts fast and has pressures enough to work again as the problem is described, T
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Hammer Time
Ultimate Carjunky
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Jun 22, 2014, 11:11 PM
Post #6 of 13
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Re: 2004 Mitsubishi Lancer AC problem
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Icing by definition turns the evaporator into a block of ice preventing air from passing through it so yes, the primary symptom of icing is loss of air flow and not temp change.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Jun 22, 2014, 11:16 PM
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Re: 2004 Mitsubishi Lancer AC problem
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It doesn't block solid all at once but will shut down system. Happened to one of mine! Still cool and plenty of air then nothing and back again just as this one is described.......... T
(EDIT) I think this car uses a sight glass (real hard to see) on receiver drier - tight so may be impossible to see the flow?)
(This post was edited by Tom Greenleaf on Jun 22, 2014, 11:25 PM)
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Tom Greenleaf
Ultimate Carjunky
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Jun 23, 2014, 12:41 AM
Post #9 of 13
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Re: 2004 Mitsubishi Lancer AC problem
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What caught my notice with this is that is always works upon start up then pulled this trick. Any which way it needs inspecting and testing. I was mistaken, two of my own with TVX systems did just this and air flow wasn't impaired! Once coming back on I-95 in FL no less! Noticed slow decline in cooling, just shut if off for two minutes and fine for hours in that one case. Knew the issue but nothing with me.
Other funky issues is if the cycles (don't know when it would shut down compressor on this) the metals of clutch and relays get hot from that and fail to allow proper current thru or NOT work at all for a while if hot. Hot metal isn't magnetic at some point in gradients. That makes for hair loss as testing when cooled off show things are fine.
Results are not in on this car. I just smell that superheat is not working at evap and system shuts down. DS asked to check as compressor would or should shut down. Ones I've caught had frost on lines if doing it in front of me.
The nice thing if true is this has a 134a sight glass - near sure. Anything could be trouble but that would help if it could be seen,
T
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Hammer Time
Ultimate Carjunky
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Jun 23, 2014, 1:53 AM
Post #10 of 13
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Re: 2004 Mitsubishi Lancer AC problem
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The bottom line is... refrigerant doesn't freeze. Water inside the system can and condensation on the exterior of the evaporator can. If the system was properly vacuumed, any moisture would have boiled off in the process. If it wasn't, then that is a possibility.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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Jun 23, 2014, 2:45 AM
Post #11 of 13
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Re: 2004 Mitsubishi Lancer AC problem
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Let's move on. It's not on the inside of course with the gas. It happens sometimes with a low charge and early evaporation hence condensation freezes. We don't know yet at all, T
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Hammer Time
Ultimate Carjunky
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Jun 23, 2014, 2:58 AM
Post #12 of 13
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Sure, as long as the poster realizes freezing doesn't create warm air, it creates no air so that is not what is going on here.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Jun 23, 2014, 3:05 AM
Post #13 of 13
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Re: 2004 Mitsubishi Lancer AC problem
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Please move past this but it does make cool air till evap returns such low pressure system shuts off till it can absorb heat and pressures rise. One glance takes no time to rule it out, T
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