777ER
08-20-09, 11:37 PM
On Aug 17th, 4th start of the day when driving home from a restaurant, the A/C was blowing warm air and it was 90* out that day.
Checked pressure with AC filling station gauges and it seems to be fine for static, unable to get true reading without the compressor running, checked compressor and it's not engaging, no clicking noise heard, compressor moves by hand.
Ran the cluster diag test and found this:
DIM P1540 CURRENT
looked it up and it's: P1540 - Air Conditioning (A/C) Refrigerant Overpressure - Air Conditioning (A/C) Disabled
So I cleared the code and turned the A/C on, it blew cold air for about a second then the compressor shut down and the DIM P1540 code came back CURRENT.
Where can I find the overpressure switch that is setting off the P1540 code?
I believe it's downstream in the system but exactly where is it located?
Checked pressure with AC filling station gauges and it seems to be fine for static, unable to get true reading without the compressor running, checked compressor and it's not engaging, no clicking noise heard, compressor moves by hand.
Ran the cluster diag test and found this:
DIM P1540 CURRENT
looked it up and it's: P1540 - Air Conditioning (A/C) Refrigerant Overpressure - Air Conditioning (A/C) Disabled
So I cleared the code and turned the A/C on, it blew cold air for about a second then the compressor shut down and the DIM P1540 code came back CURRENT.
Where can I find the overpressure switch that is setting off the P1540 code?
I believe it's downstream in the system but exactly where is it located?