That is the check engine light. It blinks under a severe misfire.
My 1997 Grand AM low pressure valve is on the air conditioner. I had to access it from the under the car. It has a blue cap on it. IF your looking from the top of the engine you can see it on the right side of the air conditioner.
The oil pressure sensor is screwed into the rear of the oil cooler, under the intake manifold.
A flashing check engine light is usually a misfire.
in the fuel pump assembly in the gas tank, in your trunk under the mat.
Slide under the front end and look up at the compressor, its right there almost on the compressor.
heavy or strong misfire, or a bad MAP sensor.
No the fuel tank should not be under pressure. The fuel line should be under pressure. When you open the gas cap, there really should not be any pressure, if you do have, then something is not working right.
It forces air under pressure into the cylinder increasing the torque output of the engine when under a load.
On a 1998 Pontiac Grand Prix, the A/C refrigerant refill port is located on the low-pressure side of the A/C system. This port is typically found near the accumulator, which is located on the passenger side of the engine bay. It has a larger fitting compared to the high-pressure port, making it easier to identify. Always ensure the engine is off and the system is not under pressure before attempting to refill.
Under vehicle, passenger side, below engine area, mounted on front passenger side end of oil pan.
the oil pressure switch is a 1 wire plug usually located on the engine block itself it could be on the side on the rear on the front under the motor on top