What Is the Normal Reading on the High and Low Side of the Ac Gauges for a 1967 Malibu

Using Gauges for Troubleshooting

Gauge pressure is the start tool in AC troubleshooting. The table below shows vii Gauge Readouts that you lot may encounter. Utilise the Gauge Readout Tool separately or in combination with the table of Gauge Diagnostics for AC troubleshooting.

Gauge Readout Tool

Normal Weather
Air in cooling system (insufficient suction)
Defective expansion valve
Excessive refrigerant
Moisture Intrusion
Refrigerant does not circulate
Summary Table of Judge Diagnostics

Normal Conditions

1 Temper
Room Temperatures of 30-38 C (86 - 96 F)
Engine speed of approx. 1500 rpm or virtually 75% of rated engine speed

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Air in cooling system (insufficient suction)

Pressure Range
Depression side: 36 to 50 psi
High side: 284 to 356 psi
Indications
Both pressures are TOO HIGH
The depression-side piping is not cold
Causes
Air in the arrangement
Remedy
Evacuate the organisation
Replenish the refrigerant
Bank check the gauge readings
If prolonged operation with air in the system, the liquid tank must be replaced.

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Defective expansion valve

Pressure Range
Low side: thirty to 36 psi
High side: 313 to 327 psi
Indications
Both pressures are Besides HIGH
Causes
Improper refrigerant accuse
Lacking expansion valve
Improper temperature sensor installation
Remedy
Verify refrigerant charge
Check temperature sensor installation and insulation
If the refrigerant charge is okay and the temperature sensor installation and insulation are right then replace the expansion valve.

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Excessive refrigerant

Pressure Range
Low side: 36 to 43 psi
Loftier side: 327+ psi
Indications
Both pressures are Also HIGH
Causes
Pressure increase due to excessive refrigerant
Insufficient condenser cooling
Remedy
Verify the refrigerant level
Clean the condenser
Check and conform the fan chugalug and / or the condenser fan motors

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Moisture Intrusion

Pressure level Range
Low side: 18 to 28 psi
High side: 85 to 256 psi
Indications
Low pressure side alternates betwixt a vacuum and normal pressure level
Causes
Moisture has frozen in the air conditioner system, bottleneck the expansion valve.
Remedy
Evacuate the system
Replace the receiver dryer
Recharge the organization

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Refrigerant does not circulate

Pressure Range
Low side: 0 to -29.99 psi
High side: 71 to 85 psi
Indications
Low force per unit area side becomes a vacuum
High pressure level as listed in a higher place
Frost or condensation on the front and rear pipe connections of the receiver dryer or expansion valve
Causes
Ac organization is blocked by contamination or water ice
AC arrangement is shut off past defective expansion valve or tempeerature sensor
Air-conditioning line from evaporator to compressor has kink in the line
Remedy
STOP Performance IMMEDIATELY
Check for contamination or water ice
If moisture is institute and so evacuate the organisation
If the expansion valve is lacking then replace it
Replace receiver dryer
Recharge with refrigerant to proper level
Repair any kinked hoses

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Summary Table of Gauge Diagnostics

 Low Pressure Side is TOO HIGH
The low force per unit area side commonly becomes likewise high when the loftier pressure level side is as well high.

Cause	Inspection	Remedy
Defective Thermoswitch	The magnetic clutch switch turns off earlier the outlet air temperature is sufficiently depression.	Supercede the thermoswitch
Poor Expansion Valve temperature sensor contact	The high and low pressure sides gauge pressures equalize when the magnetic clutch is turned off (inside a short time duration)	Replace Compressor
Expansion Valve opens likewise far	Frost has adhered to the suction hose / pipe	Install the temperature sensor against the low pressure pipe and cover with insulating tape.
Clogged compressor suction filter	Compressor fitting is absurd but the low pressure hose is not.	Remove and clean the filter.

Low Pressure Side is TOO Depression

Cause	Inspection	Remedy
Bereft Refrigerant	There is little temperature deviation betwixt the low and high pressure sides.	Repair any leaks and recharge the refrigerant to the correct levels.
Chock-full liquid tank (receiver dryer, accumulator)	Considerable temperature difference between the inlet and outlet sides of the receiver dryer during functioning. Also, tank may be frosted	Supervene upon liquid tank (receiver dryer)
Clogged expansion valve	Expansion valve inlet side is frosted. By and large the low side pressure is about vacuum.	Replace expansion valve.
Expansion valve temperature sensor gas leak (damaged capillary tube, etc..)	Expansion valve outlet side is chilled and low pressure level side is Depression.	Clean or replace expansion valve.
Clogged or blocked piping	Low force per unit area readings subtract or a negative reading is shown. Indicates piping is clogged or blocked between the evaporator coil and the compressor. A frost spot may indicate the signal of blockage.	Clean or replace piping.
Defective thermoswitch (cold control)	Evaporator is frozen showing ice forth the face of the coil, not merely frost on the manifolds of the coil.	Adjust temperature sensing tube to a cooler part of the whorl or supercede the thermoswitch.

High Pressure level Side is Likewise High

Crusade	Inspection	Remedy
Poor Condenser cooling	Dirty or clogged condenser fins, Cooling fans practise not operate correctly.	Clean and / or repair the condenser core / fans.
Excessive refrigerant	Verify by gauge reading	Use your refrigerant recovery equipment to capture excess refrigerant. Charge to the correct refrigerant levels.
Air in the system	Pressure level is loftier on both high and depression sides	Evacuate, vacuum and recharge with refrigerant.

High Pressure Side is Too Low

Cause	Inspection	Remedy
Bereft refrigerant	Piddling temperature difference between the depression and high pressures.	Repair whatsoever leaks and recharge the refrigerant to the correct levels

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Source: https://www.perrinmfg.com/resources/gauge-diagnostics

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