On a R134a system the low side service port is the smaller one.
The low pressure port usually has a blue cap on it. The high and low pressure ports are different sizes so the they can not be accidentally interchanged.
High side (pressure) & low side (pressure) are separated by an expansion valve (located in the evaporator unit for Celica). High pressure side are of smaller pipes (warm/hot when A/C running)-->compressor -->condensor --> receiver drier -->expansion valve. Low pressure side has bigger pipes cool/cold when A/C running) -->expansion valve -->compressor. It should route under the airflow meter, going around the consensor & back to the compressor. Hope this helps, cheers, Kev.
look on top of the valve caver and it will have SOHC/or/DOHC. that will tell u if its either check it out.
If your pressure exceeds the setting of the PRV or is below the setting
Modulating Valve ???? If you can tell me what system this valve would be in I can tell you the correct name for it and its location. example IPR valve in the high pressure oil system.
call a service technician with meter and live to tell about it......................
You really can't tell the exact pressure. All striking the side will do it tell you that there is pressure in the tire and enough experience striking a tire that is properly inflated will give you an idea if it is close to correct.
A tell tale on a relief valve is a small opening or connection that allows excess fluid to escape when the relief valve opens. It is used to visually indicate when the relief valve is relieving pressure and discharging fluid. Tell tales are important for monitoring the performance and functionality of relief valves in a system.
Check your fuel pressure at the fuel rail. If the pressure is low, and your filter is not clogged, fuel pump is likely suspect.
Very often, the water line for the refrigerator comes from a saddle valve. This is a valve that is clamped on a water line and makes a small hole in it. Depending on the quality of your water supply, minerals in the water can collect in the hole and reduce the amount getting through. Sometines you can screw the tap back in on the valve and clear the line or with the water shut off, take the saddle valve off, drill a slightly larger hole in the pipe and re install the valve over the hole.
you will see oil all around the valve cover and running down the side of the block.
The low pressure side is usually the fatter tube of the two. That's how it is on my '97 3.9.