A/C Issue
#1
07-01-2021, 06:38 PM
A/C Issue
So got an issue with wifes fit...
ac is great at idle
when driving not so good (or revving to 2k rpm)
I tested it and this is what i found, outside temp was 88*F
With a/c off, the low pressure side was @145psi (don't know if that high or right)??
At idle, ac on, fan on high, recirc vent closed, low side pressure was 36 psi, that was able to achieve 33*F after just a few mins.
When doing the same but with recirc vent open that was only able to get to 55*F
and at idle the outside core in front of the rad was reading at 108*F
When reving the car to 2,000 rpms, ac on, fan on high, recirc vent closed, low side pressure was 46 psi, and that was able to achieve 28*F after just a few mins
the low pressure would drop to about 20psi and the compressor would kick off for a few seconds then re-engage
So what do you guys think is the root cause of this, cus dam it some cold a** ac at idle but driving the shit sucks... I know it sucks cus that backwards and should work better when driving
Ill add the pic in the next post
ac is great at idle
when driving not so good (or revving to 2k rpm)
I tested it and this is what i found, outside temp was 88*F
With a/c off, the low pressure side was @145psi (don't know if that high or right)??
At idle, ac on, fan on high, recirc vent closed, low side pressure was 36 psi, that was able to achieve 33*F after just a few mins.
When doing the same but with recirc vent open that was only able to get to 55*F
and at idle the outside core in front of the rad was reading at 108*F
When reving the car to 2,000 rpms, ac on, fan on high, recirc vent closed, low side pressure was 46 psi, and that was able to achieve 28*F after just a few mins
the low pressure would drop to about 20psi and the compressor would kick off for a few seconds then re-engage
So what do you guys think is the root cause of this, cus dam it some cold a** ac at idle but driving the shit sucks... I know it sucks cus that backwards and should work better when driving
Ill add the pic in the next post
#2
07-01-2021, 06:40 PM
#3
07-01-2021, 06:49 PM
idle, fan high, rec closed
idle, fan high, rec closed
idle, fan high, rec open
idle, fan high, rec open
2000rpm, fan high, rec closed
2000rpm, fan high, rec closed
condenser, both cooling fans on, idle, fan high, rec closed
#4
07-02-2021, 10:47 AM
A few thoughts about your AC. First for R134a refrigerant the resting pressure is roughly equal to the ambient surrounding the car. So if you had 88 degrees rest pressure would be about 100 psi, it’s not exactly a 1:1 but close. You need to let the system equalize for about 30 minutes. The running pressures and temperatures seem to be in normal ranges. If you can achieve 30 to 35 degree temperature split between outside and discharge at vent that’s pretty good. Run in recirculating mode and not fresh air on high temperature and humidity days. Also check your cabin filter and make check it’s clean.
See this link for a detailed explanation of troubleshooting if you want more information.
https://autoacrepair1.com/proper-aut...s-temperature/
See this link for a detailed explanation of troubleshooting if you want more information.
https://autoacrepair1.com/proper-aut...s-temperature/
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