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Symptom
l Coolant heats up
l Vehicle interior remains
cold
Smell of exhaust in vehicle in-
terior
9039412C Workshop manual TTP 120 _ 150
Possible cause
Fuel supply disrupted
Vehicle fan does not actuate
Exhaust system
Possible troubleshooting
u
Check fuel supply (tank
empty, lines clogged, fuel
line only partially filled)
u
Check fuel filter
u
Check tank extracting
device and fuel line for
leaks
u
Bleed fuel system
u
Check fuse
u
Check the relay for vehicle
blower
u
Check coolant temperature
(switches On at approx.
30 °C)
u
Check switch signal at the
relay, ground and voltage
(audible, see wiring dia-
gram)
u
Measure coolant temperat-
ure signal line (green/white,
gr/ws), pin on relay
u
Check exhaust pipes (not
clogged, rectify leaks)
u
Check if exhaust pipe has
been incorrectly installed
(see installation instructions)
Malfunctions and troubleshooting | 6
Comments / Service
l If the coolant gets warm
but the vehicle interior re-
mains cold, heat removal
out of the coolant circuit is
disturbed.
l The switch signal of the
vehicle fan is not OK.
l Vehicle fan not OK.
l Vehicle fan not activated,
vehicle heat control flap
position for warming the
vehicle interior not OK
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