The
charge hose with in-line gauge
allows the low side pressures of
the air conditioner to be checked.
The following chart offers a general
guide to correct low side pressures
at given ambient temperatures,
when the air conditioner is switched
on and has been running for at
least 3 minutes. These are indicated
by the blue areas on the gauge:
| Ambient
Temp (ºC) |
Low
side pressure Kg/cm² |
| to 20ºC |
1.75 – 2.5 Kg/cm² |
| 25ºC |
2.5 – 3.0 Kg/cm² |
| 30-40ºC |
3.0 – 3.8 Kg/cm² |
The colour code on the gauge
shows these guidelines in the
following simplified terms:
| Colour |
Indication |
| Green |
Refrigerant is low. Could also indicate a faulty expansion valve |
| Blue |
Refrigerant is full and
does not require topping
up. |
| Yellow |
System requires professional
intervention |
| Red |
Danger. Do not attempt
to work on the system. Take
the vehicle to a professional
technician trained in air
conditioning service work |
Refrigerant should only be added
if the gauge reading is in the
green area.
This product will only indicate
the low side pressure. Correct
diagnosis can be achieved only
by monitoring both high and
low side pressures, and vent
temperatures, and by using professional
equipment. If you are in any
doubt do not use this
product. |
