SY M PT OM S DI AGN OSI S
Symptom Possible Causes
Smell of diesel fuel. Check cabin 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 cabin heater and re-inspect.
Inspect the exhaust tube and cabin heater for the presence of exter-
nal fuel. If presence of external fuel is observed on the heater unit or
in the exhaust tube or after draining and testing. Remove the cabin
heater from vehicle and repair or replace components as required.
Heater does not achieve full load op-
eration.
Check cabin heater operation with DRBIII" scan tool and replace
components as required.
Continuous white smoke from heater
exhaust during combustion operation.
Check cabin heater operation with DRBIII" scan tool and replace
components as required. White smoke is typical in extreme weather
conditions.
Heater can not be switched off. Check cabin heater operation with DRBIII" scan tool and replace
components as required.
Heater does not operate. Diagnosis cabin heater control module using the DRBIII" scan tool
and the procedures listed in Vehicle Performance under Cabin Heater
Diagnosis in Group 18.
Loss of coolant (Leakage) or heater
develops smoke during combustion
operation and exhaust has an ex-
tremely sweet smell.
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 cabin heater should be inspected and
components should be replaced as required.
Loss of fuel (dripping). Check cabin heater system integration in vehicles fuel system. Check
fuel line connection for leakage. If OK there is an internal leak and
cabin heater should be inspected and replaced as required.
EX H AU ST T U BE
REMOVAL
WARNING: There is a potential danger of skin burns
as the supplemental cabin heater unit and its com-
ponents can become very hot. Make sure the heater
unit is allowed to cool down before any service
work on the cabin heater system is attempted. Fail-
ure to observe this warning may result in possible
personal injury.
(1) Raise and support the vehicle while takin g note
of the locat ion of th e flexible exhau st tube section.
(2) Remove the exha ust clamp at the flexible pipe
and steel pipe connection (Fig. 1).
VA CABIN HEATER 24 - 105
To Next Page
Loading...
