Shut the engine off when you have enough air pressure so that the low pressure warning signal is not on.
It is moderatly warm in a low pressure system
the light is to warn you the tyre pressure is low
bleed your brakes so they are a low pressure and make sure the light comes on also make sure you fil your brakes up again afterwards or you might have some problems
the oil pressure sending unit is designed to warn you of a low oil pressure. If the sensor goes bad then the low pressure light or gauge will read low when the oil pressure is actually ok.
Areas of high pressure are calm, but low pressures signal stormy conditions.
15
On a 1993 Grand Am (and most other GM front drivers) there is no low pressure switch, instead it has a thermal expansion valve system with a "pressure transducer" located on the high pressure hose. The pressure transducer sends a square wave digital signal to the PCM, which can calculate high side pressure in PSI through a mathematical formula, which in turn sends a signal to the a/c compressor clutch relay to turn on if the pressure is within the set parameters. The a/c pressure transducer cannot be checked with a test light or such, you WILL short the computer if you try!!
50 psig
Tire pressure warning light either low tire pressure or uneven tire pressure
Th oil indicator light in most cars is attached to an oil pressure sensor. The sensor is designed to warn of low pressure to prevent engine damage.
30 psi
10 psig