2007 KIA CARNIVAL engine

2007 > 2.7L V6 GASOLINE >
DESCRIPTION
1.A.Q.S is located at center support in front of the engine radiator, and detects hazardous elements in ambient air
providing output signal to control.
2. It will detect sulfurous acid gas, carbon dioxide, carbon monoxide, hydrocarbon and allergen.

2007 > 2.7L V6 GASOLINE >
REPLACEMENT
1.Disconnect the negative ( - ) battery terminal.
2. Recover the refrigerant with a recovery/ recycling/ charging station. (Refer to HA - 8)
3. When the engine is cool, drain the engine coolant from the radiator.
4. Remove the bolts (A) and the expansion valve (B) from the evaporator core.
Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.
5.Disconnect the inlet (A) and outlet (B) heater hoses from the heater unit.
Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure not to let
coolant spill on electrical parts or painted surfaces. If any coolant spills, rinse it off immediately.
6. Remove the crash pad (Refer to BD group).
7. Remove the cowl cross bar assembly. (Refer to BD group)
8. Disconnect the connectors from the temperature control actuator, the mode control actuator and the evaporator
temperature sensor.
9. Remove the heater & blower unit after loosening 3 mounting bolts.

14.Remove the evaporator core(A).
15.Be careful that the inlet and outlet pipe are not bent during heater core removal, and pull out the heater core.
16. Install the heater core in the reverse order of removal.
17. Installation is the reverse order of removal, and note these items :
a. If you're installing a new evaporator, add refrigerant oil (ND - OIL8).
b. Replace the O - rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing
them. Be sure to use the right O - rings for R- 134a to avoid leakage.
c. Immediately after using the oil, replace the cap on the container, and seal it to avoid moisture absorption.
d. Do not spill the refrigerant oil on the vehicle ; it may damage the paint ; if the refrigerant oil contacts the paint,
wash it off immediately
e. Apply sealant to the grommets.
f. Make sure that there is no air leakage.
g. Charge the system and test its performance.
h. Do not interchange the inlet and outlet heater hoses and install the hose clamps securely.
i. Refill the cooling system with engine coolant.

2007 > 2.7L V6 GASOLINE >
DESCRIPTION
The fuel fired heater has been applied to the diesel engine (CRDi) to increase heating capability by using diesel only in
cold weather
a.Follow the procedures specified in this bulletin during service or it may cause personal injury.
b. Be sure to turn the fuel fired heater off when refueling at station.
c. The fuel fired heater must be mounted at designated position, never in the passenger compartment.
d. The fuel fired heater must be kept below 120°C or a permanent failure on the components may occur.
e. Operational principle : The following 3 conditions should be met at the same time for automatic operation of
the fuel fired heater.
a. Engine runs.
b. Ambient temperature is lower than 2°C (Winter)
c. Coolant temperature is lower than 68°C
f. Cleaning process
a. A cleaning process of the fuel fired heater will be performed automatically when the heater is not operated
due to increase of coolant temperature and ignition off.
b. During cleaning process, supplied fuel in the heater will be burnt completely and any smoke will be expelled.
It is a necessary process for next operation and durability of the heater and takes about 3 minutes.
g. Others
The following symptoms should be explained to customers or technicians as a normal occurrence.
a. A white smoke may come out from the fuel fired heater exhaust pipe installed at the front side of the right
front tire during operation of the heater.
This is not an exhaust fumes.
When moisture in the fuel and air is discharged from the heater and is met cold ambient air, it is condensed
and looks like a white smoke however, when an excessive black smoke is discharged, the fuel fired heater
should be inspected.
b. A "buk- buk" noise from the heater is a noise to form flame for combustion. This is a normal operation.
c. When the heater is operated at full load, a "Wooing" noise is occurred.
d. When shutting off the engine during heater operation, a "Wing" noise is occurred to perform the cleaning
process.
OVERVIEW
1.This fuel fired heater supplies additional heat to the interior compartment with a low fuel consumption to
compensate the heat provided by engine alone.
2. The fuel fired heater has been adopted to warm up the interior compartment in a short time.

3.The two coolant temperature sensors are installed to the heater inner. The sensor valves determine heater
operation.
4. One of the temperature sensors functions to prevent the heater from overheating.
If the sensor temperature valve exceeds 125°C, the fuel will be cut and the heater will be deactivated by the
determination of the overheating of the heater.
The other temperature sensor determines the operation mode of the fuel fired heater.The temperature of this
sensor enables to activate the heater at full load(5kw) or half load(2.5kw).
• The coolant temperature shown on the above Figure is the value of the inner sensor and the actual coolant
temperature is higher about 5°C ~7°C than the above value.
OPERATION
Switch on/ Operation start
The fuel fired heater is operated when the coolant temperature is below 68°C and the ambient temperature is below
2°C after starting the engine.
At this time, the glow plug and combustion air fan are operated first and after 30 seconds, the dosing pump is
operated with stopping the combustion fan for 3 seconds.
After that, the operation of the fan increases continuously until it approaches to full load within 56 seconds. If fuel
supply reaches to full load the glow plug does not operate and the operation of the fan reaches to full load.
After that the glow plug monitors ignition condition as a flame sensor for 45 seconds.
The above operation procedure is done automatically and in case the ignition fails, the above operation will be done
again automatically.
If the condition of ignition failure sustains continuously, fuel supply and fan operation will be stopped and error codes
will be stored to find cause of failure.
Generally, the cause of ignition failure during combustion is caused by the automatic re- operation of the above
procedure.
Operation for heating
The fuel fired heater operates at full load when the coolant temperature is below 68°C and the ambient temperature is
below 2°C after starting the engine.
It operates at half load when the coolant temperature is 74°C and it operates at idle mode when the coolant
temperature is 78°C.
The fuel fired heater during the transformation process does a cleaning function from the half mode to the idle mode.
At idle mode, all components do not work.
The fuel fired heater operating at idle mode turns into the half load when the coolant temperature is 74°C. At this time,
if the coolant temperature drops again below 68°C, the heater operates with full load and turns into the idle mode if
the temperature is 78°C.
This serial operating process is performed automatically.
Key switch off / Operation stop
The fuel fired heater ECU stops the operation of the fuel pump and cuts fuel supply when shutting off the engine
during the heater operation.
The heater conducts cleaning operation at this time.
This is a process of burning the fuel completely supplied in the heater inner.
In this process, the glow plug and combustion air fan are operated.

When the cleaning process is over, the operation of the heater is stopped.
The time for cleaning when the engine is turned off during the operation of the heater at full load is about 175
seconds.
About 100 seconds are required to conduct the cleaning of the heater at half load condition.
The operating sound of cleaning the heater is heard from the outside of the heater after turning the engine off and this
is a normal process of operation

2007 > 2.7L V6 GASOLINE >
INSPECTION
OPERATION TEST
Fuel-fired heater operation test by force using Hi-Scan
1. Start the engine.
2. Connect the Hi - Scan to the vehicle.
3. Select "SORENTO" and then select "FUEL FIRED HEATER".
4. Select "04. ACTUATION TEST" mode.
5. Select "PREFILLING + HEATING" to conduct the performance test after replacing the fuel fired heater system.
Fuel supply and heating will be initiated if the "F1 key STRT" is pressed.
However, a repair or replacement of the components related to the fuel line system in the fuel- fired heater were not
done, operate the component by force after selecting the appropriate item from the menu screen.
Do not operate the system by force with selecting the “ PREFILLING + HEATING ” option if no repair for the
fuel line relating components has been done.
This means the fuel is in the fuel line.If an excessive fuel is supplied, it may cause smoke and abnormal
"Banging" noise when the fuel is burned.
If the "F2 KEY STOP" is pressed, operation test is stopped.
For self - diagnosis test and sensors outputs during compulsory operation test, press "ESC KEY".
When a self - diagnosis test is completed, disconnect the self - diagnosis connector or press "F2 KEY STOP"
from the "PREFILLING + HEATING" menu to stop the compulsory operation.
In case of selecting the individual part (ex. Combustion air fan, water pump, ), press "ESC KEY" to stop the
test.
In case of selecting the "PREFILLING + HEATING" option, about 2 minutes are required to conduct cleaning
process after pressing the "F2 KEY STOP".
It is a normal process to burn the fuel left in the fuel line.
6. To conduct self diagnosis test, press "ESC" and then "01. DIAGNOSTIC TROUBLE CODES" option.
7.Select "02. CURRENT DATA" to view the current status of the components.

2007 > 2.7L V6 GASOLINE >
DESCRIPTION
PTC (Positive Temperature Coefficient) heater (A) is an electric heater using a PTC element as an auxiliary heating
device that supplements deficiency of interior heat source in highly effective diesel engine (U engine).
An electric heater heats up the interior by directly heating the air that passes through the heater.
PTC = positive Temperature Coefficient
The name itself implies that the element has a proportional resistance change sensitive to temperature. PTC heater is
installed at the exit or the backside of heater core.
OPERATION PRINCIPLE
ECM outputs a PTC on signal. Operate PTC from 1st setting to 3rd setting with an interval of 15 seconds.
Heat up the air, which passes through a heater core.
OPERATION CONDITION
Judge the condition by ambient temperature is below 5°C, coolant temperature is below 70°C, and battery voltage is
above 11V and engine RPM is above 700RPM.