Heater Core Description - GMC Chevrolet Camaro 1998 Service Manual

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HVAC
The sealed accumulator is connected to the evaporator
outlet pipe. The accumulator stores the refrigerant
(vapor and liquid) and the oil from the evaporator.
A desiccant at the accumulator bottom dries any
moisture in the system. An oil bleed hole at the
accumulator outlet pipe end provides the oil return
path to the compressor. The accumulator is not
serviceable and should only be replaced when leaking
due to the following conditions:
• Perforation
• A damaged sealing area
• Damaged fastener threads
• Outside air has entered the system for extended
periods of time
Heater Core Description
The heater core is the main component of the heater
system. The heater core is located inside of the
heater and evaporator module. Engine coolant is
pumped into the heater core from the engihe whenever
the engine is operating. The heater core fins transfers
the heat from the engine coolant to the air passing
over the heater core. The heater core has specific inlet
and outlet tubes. The placement of the heater hoses
should be noted prior to servicing the heater core
or the heater hoses.
HVAC System - Manual 1-121
The temperature control is linked to the temperature
valve by a flexible control cable. When you rotate,
temperature control counterclockwise to the full COLD
position, the temperature valve is held snugly
against the air entrance to the heater core. The
following actions occur:
• All of the airflow from the evaporator bypasses the
heater core.
• No heat transfer occurs.
When you turn the temperature control away from the
full COLD position, the temperature valve begins to
direct air to the heater core. This action allows
air to flow through the heater core. The farther the
temperature control is rotated clockwise, the more the
temperature valve directs air through the heater
core. The air discharge is warmer when most of the
airflow is heated in this manner. The air discharge
is warmer because the heated and unheated air flows
join and mix together thoroughly beyond the
heater core.
When you rotate the temperature lever clockwise to
the full HOT position, the temperature valve blocks off
the passage that allows air to bypass the heater
core. This action causes passage of the airflow
through the heater core.