Dismantling and assembling heater unit “D2L” (diesel) — VW

Dismantling and assembling heater unit
“D2L”
(diesel)
Upper heat shield
Upper outer cover
Removing:
Remove support plate
Item
, remove bolts
Item
on side of outer cover.
Take off outer cover.
Unclip sealing strip
Item
.
Installing:
Fit sealing strip
Item
on lower outer cover.
Fit outer covers to one another and bolt together.
Ensure sealing strip is seated perfectly.
Self-tapping screw B4.2x9.5
Use with silicone washer.
Bolt M5×8
Use with silicone washer.
Bracket
Hexagon nut M6
Spring washer
Bonded rubber mounting
Heater combustion monitor
F16
The combustion monitor switches the
glow plug for heater
Q9
Item
off after a stable flame has been established and terminates the safety time. The monitor also terminates the run-on when the heater unit has cooled.
Opens at temperatures above 100°C ± 3°C.
Closes at temperatures below 90°C ± 4°C.
Renewal
Chapter
.
Heat exchanger
Note
Do not remove combustion chamber from heat exchanger.
Clamp
Sealing ring
Always renew after dismantling.
Combustion, fresh and heated air blower
V81
Removing and installing
Chapter
.
Dismantling and assembling
Chapter
.
Electric motor for
combustion, fresh and heated air blower
V81
.
Removing and installing combustion, fresh and heated air blower
Chapter
.
Dismantling and assembling
Chapter
.
Temperature limiting switch
F82
The temperature limiting switch switches the heater to reduced output when the outlet temperature exceeds 125°C.
Renewal
Chapter
.
Sealing strip
Wiring distributor
“T”
(printed circuit board)
The diesel electric heater wiring distributor is marked with a white
“D”
.
Terminal assignment:
Current flow diagrams, Electrical fault finding and Fitting locations
Temperature sensor
G18
The heat output is dependent upon the setting of the temperature control switch and the temperature measured at the temperature sensor.
The temperature sensor is secured to the combustion, fresh and heated air blower.
Bolt M5×8
Lower outer cover
Note
Ensure 2 mm drilling in lower outer cover is clear and free of debris.
Seal, red
When installing, ensure sealing strip is seated perfectly.
Support plate
Self-tapping screw B4.2x13
Use with silicone washer.
Glow plug wiring
Protective cap, red
Glow plug for heater
Q9
17 Nm
Sealing strip
Installing:
Coat with Vaseline.
Fit to lower outer cover.
Ensure sealing strip is seated perfectly.
Lower heat shield
Lower insulation plate
Installing:
Determine insulating plate position from previous plate and secure to heat shield using a silicone adhesive sealing compound.
Upper insulation plate
Installing:
Determine insulating plate position from previous plate and secure to heat shield using a silicone adhesive sealing compound.
Heater overheating switch
F17
The overheating switch switches off the fuel supply when the heated air exceeds the maximum permissible temperature. The red malfunction warning lamp in the temperature control switch also flashes.
Opens at temperatures above 110°C ± 4°C.
Closes at temperatures below 95°C ± 4°C.
Renewal
Chapter
.
Self-tapping screw B4.2x9.5
Use with silicone washer.