Why does air conditioner pressure not change when clutch is engaged?
Q: Air conditioning pressure doesn’t change when clutch is engaged. Recently had an AC Line (High Side) blow, assumed it was just an old line. Replaced the line, the drier and did an full evac and started to put fluid back in with a gauge set. Once the clutched engaged the pressures didn’t change at all, so I figured the compressor had to be bad.
How to test AC pressure with a manifold gauge?
How to test AC pressures with a manifold gauge. 1, Set the AC controls to MAX and RECIRCULATE 2. Blower set to HIGH speed 3. Close the doors. Windows can be open. 4. Once you attach your gauges and start your engine, keep RPMs steady at around 1,200 to 1,500 RPM. Refer to this chart for AC pressure gauge diagnosis. What the AC gauge pressures mean
What does the Red side of the a / C gauge mean?
The red, high side gauge is used to measure the high pressure side of the a/c system. This gauge has no markings that indicate vacuum. It reads positive pressure only.
What’s the temperature on an AC pressure gauge?
Normal high and low AC ambient temperature pressure chart Ambient Temperature in °F Low side Pressure Gauge reading and High side Pressure Gauge reading 65°F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi
How does the clutch work on a compressor?
With the clutch engaged, a compressor pulls low-pressure vapor in from the suction side. It compresses and discharges it at a higher temperature and pressure through the discharge side. These pressures and temperatures are highly predictable and affected by the ambient or outside temperatures.
Q: Air conditioning pressure doesn’t change when clutch is engaged. Recently had an AC Line (High Side) blow, assumed it was just an old line. Replaced the line, the drier and did an full evac and started to put fluid back in with a gauge set. Once the clutched engaged the pressures didn’t change at all, so I figured the compressor had to be bad.
What does a manifold gauge on an AC mean?
A manifold gauge set measures refrigerant pressures inside of an air conditioning system. An automotive air conditioner has a high and low side, divided by a metering device and the A/C compressor.
What should the pressure be on my air conditioner gauge?
You can begin testing with only 45 psi. You won’t get any cold air, but you should should start to see some compressor engagement. As soon as the compressor engages, it will cycle off rather quickly when the suction side of the compressor draws the pressure on the low side below 20 psi..