Automotive Air Conditioning Information Forum

Understood and accepted. The system has not been breached since new in 2016. If anything, some r134 has escaped through Schraders, shaft seals, etc. My focus is on oscillations and the possible causes, so troubleshooting can have direction. Does the TXV remain partially closed after the AC is turned ...

Thank you for your response. The pressures were taken with Testo 549i. The low pressure black scale, starting at the bottom, is 10 psi, 22.5 psi, and 45 psi. The high pressure red scale, starting at the bottom, is 0 psi, 75 psi, 150 psi, and 225 psi. My question is about possible cause(s) for the ...

8-11-25 Pressures Annotated.PNG Winnebago Navion on 2016 Sprinter 3500 Chassis. The AC r134 pressures seem to fluctuate excessively and are not in the expected range for an outside temp/humidity of 80F/60%. Low pressure in Black and high pressure is Red. The graph shows the OFF condition with the ...