Isuzu 1999 RODEO Workshop Manual page 57

Thus, ice or frost may form immediately after the
restriction. If air flow through the condenser or radiator is
blocked, high discharge pressures will result. During
normal condenser operation, the refrigerant outlet line will
be slightly cooler than the inlet line.
The vehicle is equipped with the parallel flow type
condenser. A larger thermal transmission area on the
inner surface of the tube allows the radiant heat to
increase and the ventilation resistance to decrease.
The refrigerant line connection has a bolt at the block
joint, for easy servicing.
Receiver / Drier
The receiver/drier (5) performs four functions:
f As the quantity of refrigerant circulated varies
depending on the refrigeration cycle conditions,
sufficient refrigerant is stored for the refrigeration
cycle to operate smoothly in accordance with
fluctuations in the quantity circulated.
f The liquefied refrigerant from the condenser is mixed
with refrigerant gas containing air bubbles. If
refrigerant containing air bubbles. If refrigerant
containing air bubbles is sent to the expansion valve,
the cooling capacity will decrease considerably.
Therefore, the liquid and air bubbles are separated
and only the liquid is sent to the expansion valve.
f The receiver/drier utilizes a filter and drier to remove
the dirt and water mixed in the cycling refrigerant.
f The sight glass, installed atop the receiver/drier,
show the state of the refrigerant.
A receiver/drier may fail due to a restriction inside the
body of the unit. A restriction at the inlet to the
receiver/drier will cause high pressure.
Outlet restrictions will be indicated by low pressure and
little or no cooling. An excessively cold receiver/drier
outlet may indicate a restriction.
The receiver/drier of this vehicle is made of aluminum
with a smaller tank. It has a 300cc refrigerant capacity.
The refrigerant line connection has a bolt at the block
joint, for easy servicing.
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–29
Dual Pressure Switch (V6,M/T)
The pressure switch (Dual pressure switch) (2) is
installed on the upper part of the receiver/drier, to detect
excessively high pressure (high pressure switch) and
prevent compressor seizure due to the refrigerant leaking
(low pressure switch), so that the compressor is able to be
turned "ON" or "OFF".
852RW007
ON
Compressor
(kPa/psi)
Low-pressure 205.9 29.4
control (29.9 4.3)
High-pressure 2059.4 196.1
control (341.3 28.4)
852RW007
OFF
(kPa/psi)
176.5 19.6
(25.6 2.8)
2942.0 196.1
(426.6 28.4)