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VA
CABIN HEATER (Continued)
Symptom
Smell of diesel fuel.
Heater does not achieve full load
operation.
Continuous white smoke from heater
exhaust during combustion operation.
Heater can not be switched off.
Heater does not operate.
Loss of coolant (Leakage) or heater
develops smoke during combustion
operation and exhaust has an
extremely sweet smell.
Loss of fuel (dripping).
EXHAUST TUBE
REMOVAL
WARNING: THERE IS A POTENTIAL DANGER OF
SKIN BURNS AS THE HEATER AND ITS COMPO-
NENTS MAY BE VERY HOT. MAKE SURE THE
HEATER IS ALLOWED TO COOL DOWN BEFORE
ANY SERVICE WORK ON THE CABIN HEATER SYS-
TEM IS ATTEMPTED.
(1) Raise and support the vehicle while taking note
of the location of the flexible exhaust tube section.
(2) Remove the exhaust clamp at the flexible pipe
and steel pipe connection (Fig. 1).
(3) Remove the clamp at the flexible pipe connec-
tion and the supplemental heater housing (if
required).
(4) Remove the three screws holding the exhaust
pipe to the body.
SYMPTOMS DIAGNOSIS TABLE
Check heater system integration in vehicle's fuel system. Check fuel
lines for leakage, kinks or obstructions. If OK, Inspect the inlet muffler,
drain as necessary. Re-test the unit and re-inspect. Inspect the exhaust
tube and heater unit for the presence of external fuel. If a volume is
observed on the unit or in the exhaust tube or after draining and testing.
Remove heater unit from vehicle and repair or replace components as
required.
Check heater operation with DRBIII scan tool and replace components
as required.
Check heater operation with DRBIII scan tool and replace components
as required. White smoke is typical in extreme weather conditions.
Check heater operation with DRBIII scan tool and replace components
as required.
Diagnosis cabin heater control module using the DRBIII scan tool and
the procedures listed in Vehicle Performance under Cabin Heater
Diagnosis in Group 18.
Inspect coolant hoses for leakage, kinks or loose hose connection.
Inspect the exhaust tube assembly for continuous flow, if OK there is an
internal heater leak and unit should be inspected and components
should be replaced as required.
Check heater system integration in vehicles fuel system. Check fuel line
connection for leakage. If OK there is an internal leak and unit should
be inspected and replaced as required.
(5) Remove the steel exhaust pipe from the vehi-
cle.
(6) Remove the flexible exhaust pipe from the
vehicle (if required).
INSTALLATION
(1) Install the flexible exhaust pipe to the heater
unit. Tighten mounting clamp securely.
(2) Position the steel exhaust pipe to the flexible
exhaust and install and tighten the mounting clamp
securely.
(3) Install the three exhaust pipe screws, adjust
pipe placement as needed and tighten the screws
securely.
(4) Install the clamp to connect the steel exhaust
pipe to the flexible exhaust pipe and tighten clamp
securely.
(5) Check exhaust pipe exhaust end placement and
make any final adjustments.
(6) Lower the vehicle.
CABIN HEATER 24 - 73
Possible Causes
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