1990 MITSUBISHI ECLIPSE heater

24-1
HEATERS
CONDITIONING
CONTENTS Rx&--
.._.........I............................... 8 HEATER CONSTRUCTIO N. . . . . . . . .._..................... 5
Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . _ . . . . . . .._.. 8IDLE SPEED CONTRO L. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . 9
tNFORMATt0N. . . . . . .._................_......2

24-2 HEATERS AND AIR CONDITIONING
1 OPA17 swash plate t:
To defroster
/A\To side defroster
9G-3 53033
ventilators
‘lo’
Driver’s seat-knee area3$
(under the fieering wheel)b
Side ventilatbr(driver’s seat side) G
Center
20A03M

_-‘5sY-HEATERS AND AIR CONDITIONING
- General Information
COMPONENTS24-3Three-Iaye; flow full
blend air heater

L.
24-4HEATERS AND AIR CONDITIONING - General Information
’ /To side (door) window
(side defroster)
t4L\ m\vTofacearea
/(side ventilator)To windshiel
(defroster)
To side (door) window
(side defroster)
Blower switch
Toface area(side ventilator)
u rorootanTemperature control knob
, , , ,Air-selection lever
Air conditioner switch
OPERATION DIAGRAM OF COMPRESSOR MAGNET
CLUTCHNOTETemperature values shown are for information only.
Air conditioning and
ECONO mode OFFAir conditioning and
ECONO mode ON
II
32 (89.6)
Evaporatorinlet temperature “WF)

HEATERS AND AIR CONDITIONING- General information I Heater Construction24-5
16AO611
Section A-A
Air intake garnish
Check
Section B-B
HEATER CONSTRUCTIONThe air-selection damper (located at the upper
part of the blower motor) can be used to select
either induction of outside air from the front
deck, or circulation of inside air.
The air taken in by the blower motor is passed
through the duct or evaporator (air conditioner
equipped vehicles) for forced supply to the
heater unit. At the right side of the heater unit is
Mode selectionTo defroster
damper
!DEF) mMode selection
3.the btend air damper. Depending on the temper-
ature control knob setting, the amount of blend#waAA
air which has passed through the heater core
and of cool air which has not passed through the
heater core is varied, thus regulating the temper-
ature.The area to which the air will
flow can be
selected by the mode-selection damper.
nFresh airMode selection
To foot areaair damper\IEvaporatorBlower motorRecirculation
dair
To foot area+-l

--
24-6HEATERS AND AIR CONDITIONING - Heater Construction
RELATIONSHIP BETWEEN THE DAMPER POSITION AND THE AIR-SELECTION LEVER, MOD:
SELECTION KNOB AND TEMPERATURE CONTROL KNOB
SETlINt%Air-selection Lever
LeverpositionDamperpositionOperation
When the air-selection lever
is placed in the illustrated mark position, the
air-selection damper closes the inside air inlet (air from the vehicle interior) and
opens the outside air inlet (air from the from
deck).When the air-selection lever is placed in the illustrated mark position, the
air-selection damper closes the outside air inlet and opens the
inslde atr inlet
(air from the vehicle interior).Mode-selection Knob
Knob position
(FACE:Large volume-air)
FOOT:-arge volume air)Damper position and air
flow direction
Recircu-
lation airOutside air
FACE
I): Large volume air --t: Small volume air
20A0242
Recircu-
lation airOutside air
FACE
-- FOOT2040243
Recircu-
lation air
FACE
FOOT
Recircu-lation air
FOOT
20A0245Air outflow locations

HEATERS AND AIR CONDITIONING - Heater Construction24-7
IKnob posltionDamper position and air flow direction
Air outflow locations
Outside air
Recircu-lation air
2010246
Recircu-iation airDEF
2OAO247Temperature Control Knob
IKnob positionDamper position and air ‘flow directionOperation
When the temperature control knob or
the heater control is rotated fully
counterclockwise toward the cool air
position, the upper side of the heater
core will be blocked up by the blend
air damper A. whereas the lower side
of the heater core
will be blocked up by
the blend air damper 8. As a result.
all the air from the blower motor does
not pass through the heater core but
directly flows out as cool air.
Blend air damper CBlend air damper A
x!= cY?l-nY-/
-1 From
To air Voutflowopenings*blower
motor
Hester ‘OreOUO,,O
Blend air damper CBlend air damper A,//7When the temperature control knob of
the heater control is rotated fully
ctockwise toward the warm air position.the blend air dampers A and Bwill block the cool air paths.
The cool air from the blower motor
passes through the heater core for
maximum heating..
Tooutflow
openings
Blend al’r damper B
When the temperature control knob of
the heater control is rotated to the
mid position, the blend air dampers A
and B will split the air stream intotwo branches, one passing through the
heater core and one not passing through
the heater core. The blend damper air
Cintroduces cool air from the heater core
top into the heater unit chamber. Air
conditioning is provided by mixing this
cool air with hot air heated by the
heater cores.
Blend air damper CBlend/ air damper AL
2OAO391Blend air damoer B
--.-__.__ ,_ .

-.-- ----_-
24-8HEATERS AND AIR CONDITIONING - Compressor
COMPRESSORR24GbCOMPRESSOR CONTROL
When both the blower switch and air conditioner
switch are ON, ON-OFF control of the magnetic
clutch is accomplished by the auto compressorcontrol unit. dual pressure switch, engine coolant
temperature switch and
MPI control unit.
Sub fusible
link
Dedicatedfuse
Air conditioner
compressor relayrOFfCompressor
magnetic clutch
q l
Fusible link
lgnitionsyhWqb 1Auto compressor control unit
ITT1 I
0 bIAirAir
inlettherm0
4sensorsensor
Engine coolanttemperature switch
Enginecontrol unit13A0167