Manifold gauge/gauges are used to check both the high and low side pressures of the refrigerant inside the a/c system...................
Manifold gauge/gauges are used to check both the high and low side pressures of the refrigerant inside the a/c system...................
You need a manifold gauge set. You set up a fan in front of your vehicle. You hook up the manifold gauge set. You run the motor with the AC on max until the compressor clutch starts cycling, and you note the high and low pressures on both the high and low side. There should be a chart which comes with the manifold gauge set which gives you ambient air temperature and relative humidity, and what the corresponding pressures should be under those conditions.
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On a manifold gauge set, there are two gauges. The gauge encased in red measures pressure on the high pressure (discharge) side. That's the "high side gauge". The other will be incased in blue, and measures vacuum pressure on the low side.
You need a chart which identified the relationship between the ambient air temperature and the pressure, as well as a manifold gauge set.
It goes to the temp gauge which is usually screwed in the head between the manifold on the drivers side, or into the thermost housing on the intake manifold.
You have a certified shop do a system performance test, unless you know how to perform such a test yourself with a manifold gauge set.
You would use R-134a along with a lubricant, they would be added to the low side port. You should check your PSI levels before you add any R-134a and then fill to the correct PSI level (which is determined by the current ambient temperature) You can find some helpful videos on the website icon listed below.Connect manifold gauge set, then set valves closed to center hose, and disconnect vacuum pump from manifold gauge set.Connect center hose of manifold gauge set to refrigerant supply.Purge air from center hose by loosening hose at manifold gauge set and open refrigerant drum valve. When refrigerant escapes from hose, tighten center hose connection at manifold gauge set.On vehicles so equipped, disconnect wire harness connector at clutch cycling pressure switch. Install jumper wire across terminals of connector.Open manifold gauge set low side valve and allow refrigerant to enter system. Refrigerant can must be kept upright if vehicle low pressure service gauge port is not on suction accumulator/drier or suction accumulator fitting.When system stops drawing refrigerant in, start engine and set control lever to A/C position and blower switch to HI position to draw remaining refrigerant into system.When specified weight of refrigerant is in system, close gauge set low pressure valve and refrigerant supply valve.Remove jumper wire from clutch cycling pressure switch connector and connect connector to pressure switch.Operate system until pressures stabilize to check operation and system pressures. During high ambient temperatures, a high volume fan may be necessary to blow air through radiator and condenser to cool engine and prevent excessive refrigerant system pressures.When charging is complete and system operating pressures are normal, disconnect manifold gauge set from vehicle and install protective caps on service gauge port valves.
You will add the R-134a thru your low side port. You will need a gauge to check the PSI level when filling. (You do not need the Manifold gauge set). There are a lot of all in one products you can purchase that have the R-134a and oil included in them. Some will even come with a reusable gauge.
Usually just a ratchet set and wrenches.
intake manifold