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If you still get the warning lights for low air, you're good. FMCSA only requires that some warning system be operational.
Behind the dash board.
No lower than 60 psi
The alarm itself would normally be located behind the display panel of the dashboard. Specific location may vary by model and interior options.
The 1997 Volvo 850 low pressure port is located on the air conditioning compressor. The low pressure port will be on the right hand side of the compressor.
Trouble code P0072 means: Ambient air temperature sensor circuit low input
The low pressure port (Suction) and the high pressure port (Discharge) are both located on the back side of the 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.
High Tech car and Low tech on dealer.
Available in the UK. The Volvo Essential Service is a low-cost alternative to standard servicing for older Volvo cars.
There is no high side service port only a low side.
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.