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Behind the dash board.
Check to see if your tires are out of round.
If you still get the warning lights for low air, you're good. FMCSA only requires that some warning system be operational.
From the bottom of the frame, to the center of the axle housing, it is suppose to be 8¾" without a trailer. With the trailer, the measurement should be 8½"
The 1990 Mazda 626 air conditioning low pressure port can be found on top of the air conditioning compressor. The low pressure port should be labeled.
Low air suspension refers to the fifth wheel height from the ground. The suspension system (low air leaf) is a suspension system with a lower ride height and is used by many transportation companies because it allows their truck to hook up to a variety of trailers. In modern days, low air leaf has been replaced with Flex Air suspension (low air leaf is still available). Flex air has the same ride height but weighs several hundred pounds less, thus allowing the truck to haul more weight in the trailer.
The 1990 Mitsubishi does not have an air conditioning recharge line. The vehicle has an air conditioning recharge port. You can recharge your air conditioning system through the low pressure port on the air conditioning compressor.
Could be a short in the alarm system, could be that the valve which activates the alarm is stuck, could be because of moisture somewhere in the system... assuming that your air pressure is building up to normal levels, that is.
Air conditioner? Blown fuse Low refrigerant
That would be the large diameter line
The low side ac port for the 1990 e 150 should be on an aluminum pipe. The pipe is on the passenger side of the engine compartment just beside of the battery.
It's down by the battery and air filter box.