2011 AC Pressure Question

[Blackdr16]

Hi all!

Quick question. My 2011 SHO is constantly cycling the AC clutch while idling or driving. Have 41K on car. My first thought was the freon was low so I checked pressure. Low side Im getting around 28 PSI. This has dropped to around 25 but no lower as the compressor kicks off - pressure climbs then clutch kicks back in and repeats the cycle again. I added 1 can of R134 while watching the pressure climb. After one can the low side stayed around 35 while dropping down to 32 at the lowest before kicking off. The fans now are coming on and staying on high while the clutch is engaged. (Normal operation, but shouldn't be on the highest speed) The clutch continues to cycle in and out about every 40 to 60 sec. AC is very cold inside the cab, so its more an annoyance while driving feeling the clutch kick in and out. Anyone have some suggestions or know what pressures the high and low should be at under normal operation? Ambient temp is about 80F currently. Thanks!!!

 

[SHOrod]

Was the A/C cold before you added a can? What is the high side showing for pressure? You might have overcharged the system now.

-Rod

 

[Blackdr16]

Rod, I think your right. It was cold before but the compressor was kicking on and off about every 30 seconds. It is acting better now that I let some freon out of the system but still isn't quite right. I'm on vacation 600 miles away in TN now so I only have a low pressure gauge with me but it's reading 30 psi or so when the system is running. It gets worse on days when it's in the high 90's but still getting cool. Think I'll let more out when I'm back home and see if it gets better.

 

[14sho]

Air in system does exactly what yours is doing also quick cycle were it cools somewhat ok on 80 or so but anything more and it gets behind

 

[Blackdr16]

I'll be headed home tomorrow so well see how the AC holds up during the heat of the afternoon. I'll post what I find out on high / low pressures when I get the gauge set on it.