
Efficiency issue or air?
I have a car that came to me on referral, the complaint was
that the A/C only blows cool while moving. The Customer
stopped at a local auto parts store to purchase a can of
refrigerant and recharge the system, when the store clerk
who was assisting him hooked up the can gauge to the low
side service port the gauge went to the red and the store
clerk gave them my card and suggested they call me. Upon
inspection of the system I found that there was 3.5% air
contamination, which I initially attributed to the can tap
being open when the clerk connected it to the low side port,
and an extremely clogged cabin air filter, after talking to
the customer they told me they had bought the car used and
they had never had any service done to the a/c system. The
customer purchased a new cabin air filter and I installed
it. Then I recovered the refrigerant, pressure tested the
system with 170 psi nitrogen for 20 minutes and there was no
loss of pressure, I then vacuumed the system down to 230
microns for 15 minutes, then let it sit for 15 minutes with
no loss of vacuum after which I pulled vacuum for another 15
minutes and then charged the system with 1 pound 2 ounces of
refrigerant. after which the high side pressures were around
140psi and the low side was around 33 psi with an 89f
ambient temperature and the vent temperature was blowing
44.3 at idle, and got down to 43 at around 1400 rpms with
the windows and doors open and the a/c on max. I then
checked the system again with my identifier and verified
that there was no air in the system. At this time I returned
the vehicle to the customer at about 9:00 am. At about 9:30
p.m. I received a text from the customer letting me know
that the a/c was blowing warm again. I called and spoke with
him to get the details, he said that they were sitting at
the drive-in movies about 30-40 minutes with the system
running and then it started to feel warm. I have a few
questions that maybe the community can help me with:
Greg Kastner ![]()
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Engine | 2.4 L |
Vehicle Data
2014 Mitsubishi Outlander ES 2.4L
Engine | 2.4 L |