Blue
Red is the high side.. The low side is blue..
the color is red
The low side gauge more than likely says retard because you hooked the low side up on the high side port
On a manifold gauge set, there are two gauges. The gauge encased in red measures pressure on the high pressure (discharge) side. That's the "high side gauge". The other will be incased in blue, and measures vacuum pressure on the low side.
On a 1996 Ford Crown Victoria : The H / L ( High / Low ) gauge : On the drivers side of the speedometer is the battery voltage gauge On the passenger side of the speedometer is the engine oil pressure gauge
Manifold gauge/gauges are used to check both the high and low side pressures of the refrigerant inside the a/c system...................
Manifold gauge/gauges are used to check both the high and low side pressures of the refrigerant inside the a/c system...................
The port next to the radiator is the low-side port
It's low on freon.
When checking a/c system operations. There are two gauges that measure high side and low side pressures.
To read gauges,you must know which is low side/high side,if you know that, then depending on which freon you are using,you read the pressures matching the temp,for example,looking at the low side gauge(blue gauge) look at R-22 freon,you will see that 40 degrees,will equal to 70 psi
Freon goes into the low pressure side of the air conditioning system. The attachment from the gauge used to put the freon in will only attach to the low pressure valve so it would be pretty hard to do it incorrectly.