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Gmc my back air shocks keep losing presure and the vehicle is low to the ground i wait for a while and it comes back up -- it does this constantly . it is a SLT utilty model
Re: Gmc my back air shocks keep losing presure and the...
There is a self leveling box on the axle or there abouts it needs adjustment follow the lines to the box and set it up or down this is a good starting point
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Low voltage where ? Power feed to the sensor ? Trouble code that says circuit voltage low . An how low ? Are you checking voltage with DMM - digital multi-meter an only seeing 5 volts ? This sensor receives a five volt reference signal from the PCM . Three wire sensor . the other two are sensor ref. ground an the other is signal voltage circuit . All three wires are to the PCM - engine computer . View videos on youtube for pressure sensor testing . How to troubleshoot an EVAP Pressure Sensor problem P0452 GM
There are 2 lines coming from the firewall on any vehicle that has ac. One is the high presure the other is the low presure. Follow each line until you find fill valve.
This valve is used to fill the system. It will be covered by a plastic cap that screws on. Each side, the high and low has one of these valves. Often the cap is labeled with an "L" for low or "H" for high. Another way to tell is to flip the caps upside down. The low presure side will always be the smaller of the 2.
The air bags should be strong and not leaking themselves. It may be a valve on the bags or the plastic line going to the back that is leaking.
Some soapy water sprayed on the air ride items may show bubbles from where its leaking. Like checking a tire for leaks.
Robert, When you come out in the morning is the vehicle sitting low to the ground especially on one corner or one end? Can you hear an air pump that seems to run for a long time? These are notorious for having the air suspension bags to start leaking. The only fix is to replace the bags. This is not a job for an amature. You can get be seriously hurt or killed if you don't know exactly what you are doing. Take it to a pro. Thanks, rich
Have you tested the presure in the system? Check the condensor, (is it clogged or restricted, also check the clutch fan. With engine NOT running, move the blade up and down. You should feel a resistance and there should me no lateral (front to back of vehicle) play.
yes alow presure switch is likely on GM and it could be out of freon ,safe way to tell is to put a set of gauges on it and it will tell by passing the low side switch will just destroy the compressor if it is out of freon
The car will still run level due to the fact the springs are holding them up. If the shocks are wet there internal seals are shot, so it is time to replace them.
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