2015-2021 Volkswagen Transporter Van Auxiliary air heater User Manual
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Auxiliary air heater for Your Volkswagen Transporter Van Sixth generation (2015-2021)

Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
7
Auxiliary air heater  
⇒ “7.1 Assembly overview – auxiliary air heater”, page 34  
⇒ “7.2 Removing and installing auxiliary air heater”, page 36  
⇒ “7.3 Removing and installing air intake silencer”, page 39  
⇒ “7.4 Assembly overview - exhaust system”, page 40  
⇒ “7.5 Removing and installing exhaust system”, page 40  
⇒ “7.6 Removing and dismantling auxiliary air heater bracket”,  
page 41  
⇒ “7.7 Removing and installing auxiliary air heater control unit  
J604 ”, page 42  
⇒ “7.8 Removing and installing heater in housing”, page 44  
⇒ “7.9 Removing and installing burner unit”, page 45  
⇒ “7.10 Removing and installing glow plug for heater Q9 ”,  
page 45  
⇒ “7.11 Removing and installing flame monitor G64 and combi‐  
nation sensor”, page 46  
⇒ “7.12 Removing and installing combustion air blower 2 V385 ”,  
page 47  
⇒ “7.13 Removing and installing heat exchanger”, page 48  
⇒ “7.14 Removing and installing temperature sensor G18 ”, page  
50  
7.1  
Assembly overview – auxiliary air heater  
34  
Rep. gr.82 - Supplementary heating  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
1 - Upper part of outer casing  
❑ Made of plastic  
❑ Removing and installing  
⇒ page 44  
2 - Flame monitor - G64- and  
overheating sensor - G189-  
(combination sensor)  
❑ Overheating and flame  
monitor  
❑ Supplied with installa‐  
tion tool  
❑ Removing and installing  
⇒ page 46  
3 - Glow plug for heater - Q9-  
❑ Supplied with special  
tool  
❑ Removing and installing  
⇒ page 45  
❑ 6 Nm  
4 - Front cover  
❑ Made of plastic  
❑ Removing and installing  
⇒ page 44  
5 - Glow pin lining  
❑ Supplied with installa‐  
tion tool  
❑ Vehicle-specific  
6 - Heat exchanger  
❑ Removing and installing  
⇒ page 48  
7 - Combustion chamber  
❑ Removing and installing  
⇒ page 45  
8 - Lower part of outer casing  
❑ Made of plastic  
❑ Removing and installing ⇒ page 44  
9 - Flange seal  
❑ Renew if damaged  
10 - Combustion air blower - V6- (combination blower)  
❑ Combustion and heating air blower in one  
❑ Removing and installing ⇒ page 47  
11 - Metering pump 2 - V386-  
❑ Removing and installing ⇒ page 51  
12 - Auxiliary air heater control unit - J604-  
❑ Removing and installing ⇒ page 42  
7. Auxiliary air heater  
35  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
7.2  
Removing and installing auxiliary air  
heater  
Note  
A type plate is fitted on the auxiliary air heater unit. This plate  
provides information about the type of auxiliary air heater installed  
in the vehicle ⇒ page 38 .  
Note  
The auxiliary air heater with bracket should only be removed if the  
bracket is damaged.  
Removing without bracket ⇒ page 38  
Special tools and workshop equipment required  
♦ Torque wrench - V.A.G 1410A-  
♦ Engine bung set - VAS 6122-  
Removing  
– Separate electrical 10-pin connector - T10ba- -1- from auxili‐  
ary air heater beneath front right seat.  
– Remove right underbody cladding ⇒ General body repairs,  
exterior; Rep. gr. 66 ; Underbody cladding; Assembly over‐  
view - underbody cladding .  
– If fitted, unbolt stone deflector strip.  
– Guide wiring harnesses through opening in floor.  
CAUTION  
The fuel system is pressurised.  
Risk of injury caused by fuel spray.  
– Wear safety goggles.  
– Wear protective gloves.  
– To release pressure, wrap a clean cloth around the connec‐  
tion, and carefully loosen the connection.  
– Separate fuel line -arrow- from auxiliary air heater.  
36  
Rep. gr.82 - Supplementary heating  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
– Seal fuel line.  
– Detach cable ties on connecting elements -2- and -6-.  
– Loosen bolts -1-.  
Note  
Do not remove bolts -1- completely.  
– Unscrew bolts -4-.  
7. Auxiliary air heater  
37  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
– Remove auxiliary air heater -3- from guide -A-.  
Type plate  
Note  
♦ Date of first use is entered on lower part of type plate.  
♦ The heat exchanger can be used for 10 years but must be  
replaced once this date has elapsed.  
Removing without bracket  
– Separate electrical 10-pin connector - T10ba- -1- from auxili‐  
ary air heater beneath front right seat.  
– Remove right underbody cladding ⇒ General body repairs,  
exterior; Rep. gr. 66 ; Underbody cladding; Assembly over‐  
view - underbody cladding .  
– Guide wiring harnesses through opening in floor.  
CAUTION  
The fuel system is pressurised.  
Risk of injury caused by fuel spray.  
– Wear safety goggles.  
– Wear protective gloves.  
– To release pressure, wrap a clean cloth around the connec‐  
tion, and carefully loosen the connection.  
– Separate fuel line -arrow- from auxiliary air heater.  
– Seal fuel line.  
– Remove exhaust system ⇒ page 40 .  
– Loosen clamp for air intake silencer at auxiliary air heater.  
– Detach cable ties at connecting elements -1- of air ducts.  
38  
Rep. gr.82 - Supplementary heating  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
– Push connecting elements in direction of -arrow-.  
– Unscrew nuts -3-.  
– Remove auxiliary air heater -1- from bracket -2-.  
Installing  
Install in reverse order of removal, observing the following:  
Torque settings  
Component  
Specified torque  
Bolts for securing auxiliary heater to 8 Nm  
underbody  
Collar nuts on auxiliary heater  
8 Nm  
7.3  
Removing and installing air intake si‐  
lencer  
Removing  
– If fitted, unbolt stone deflector strip.  
– Detach clamps or cable ties at connecting elements of air  
ducts -1-.  
– Push air ducts in direction of -arrow- off auxiliary air heater.  
– Unscrew bolts from bracket of auxiliary air heater.  
– Lower auxiliary air heater.  
– Secure auxiliary air heater to body, e.g. with a welding wire.  
– Unscrew bolt -3-.  
– Remove clamp -2-.  
– Unscrew air intake silencer -1- in direction of arrow.  
– Loosen clamp -5-.  
– Remove air intake silencer -4- from auxiliary air heater.  
Installing  
Install in reverse order of removal.  
7. Auxiliary air heater  
39  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
7.4  
Assembly overview - exhaust system  
1 - Bracket  
❑ Removing ⇒ page 41  
2 - Collar nut  
❑ 8 Nm  
3 - Exhaust system  
❑ Removing and installing  
⇒ page 40  
4 - Flange bolt  
❑ 8 Nm  
5 - Clip  
❑ 6 Nm  
7.5  
Removing and installing exhaust system  
Removing  
– Remove right underbody cladding ⇒ General body repairs,  
exterior; Rep. gr. 66 ; Underbody cladding; Assembly over‐  
view - underbody cladding .  
– If fitted, unbolt stone deflector strip.  
CAUTION  
Danger of severe burns from hot exhaust system.  
Risk of burns to hands and other parts of body.  
– Allow exhaust system to cool down.  
40  
Rep. gr.82 - Supplementary heating  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
– Loosen clamp -5-.  
– Unscrew bolt -4-.  
– Detach exhaust system -3-.  
Installing  
Install in reverse order of removal, observing the following:  
Torque settings  
♦ ⇒ “7.4 Assembly overview - exhaust system”, page 40  
7.6  
Removing and dismantling auxiliary air  
heater bracket  
Remove for renewal only  
Special tools and workshop equipment required  
7. Auxiliary air heater  
41  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
♦ Torque wrench - V.A.G 1410-  
– Removing auxiliary air heater without bracket ⇒ page 42 .  
– If fitted, unbolt stone deflector strip.  
– Unscrew nuts -3-.  
– Remove bracket -2- from auxiliary air heater -1-.  
Dismantling bracket  
– Remove bracket from auxiliary air heater ⇒ page 41 .  
The complete bracket consists of 3 parts, each connected to a  
rubber buffer.  
Rubber buffers -1- are secured by means of hexagon nuts -2-.  
♦ Dimension -A- = 10 mm  
♦ Dimension -B- = 16 mm  
Note  
During installation, dimension -A- must face upwards.  
Torque settings  
Component  
Specified torque  
8 Nm  
8 Nm  
Nuts securing rubber buffers  
Nuts securing auxiliary heater  
7.7  
Removing and installing auxiliary air  
heater control unit - J604-  
Special tools and workshop equipment required  
42  
Rep. gr.82 - Supplementary heating  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
♦ Torque screwdriver - VAS 6494-  
Removing  
– If fitted, unbolt stone deflector strip.  
– Remove heater unit from housing ⇒ page 44 .  
– Disconnect electrical connectors -1-.  
– Move wiring harnesses aside.  
– Unscrew bolts -2-.  
– Detach auxiliary air heater control unit - J604- -1- upwards  
from heater unit -2-.  
Installing  
Install in reverse order of removal, observing the following:  
Note  
When installing, make sure that the 10-pin connection is located  
on the glow plug end.  
– Screw in bolts -2- loosely.  
– Tighten bolts -2- alternately in diagonal sequence to specified  
torque.  
Specified torques  
Component  
Bolts -2-  
Specified torque  
1.5 Nm  
7. Auxiliary air heater  
43  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
7.8  
Removing and installing heater in hous‐  
ing  
Removing  
– Release locking tabs -2-.  
– Swing cover -1- in direction of -arrow-, and detach it.  
– Remove connector grommet -2- from lower casing -1-.  
– Pull air outlet cowling -2- off lower casing -1-.  
– Pull off flange seal -3-.  
– Swing heater unit -2- in direction of -arrow- out of lower casing  
-1-, and remove it.  
Installing  
Install in reverse order of removal, observing the following:  
Note  
If the lower casing is to be renewed, attach a new type plate, and  
transfer the data from the old type plate to the new one.  
Installing  
Install in reverse order of removal, observing the following:  
– Before installing, check flange seal of heater unit for damage.  
Renew if necessary.  
44  
Rep. gr.82 - Supplementary heating  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
7.9  
Removing and installing burner unit  
Special tools and workshop equipment required  
♦ Torque wrench - V.A.G 1410A-  
Removing  
– Remove combustion air blower 2 - V385- ⇒ page 47 .  
– Unscrew bolts -2-.  
Note  
Combustion chamber -1- is removed along with glow plug for  
heater - Q9- and fuel pipe.  
– Pull out combustion chamber -1-.  
Installing  
Install in reverse order of removal, observing the following:  
– Renew seal between combustion chamber -1- and heat ex‐  
changer.  
Note  
When reassembling, use the rubber grommets for the wiring har‐  
ness of the glow plug for heater - Q9- and fuel pipe as a guide.  
– Insert combustion chamber -1-.  
– Screw in bolts -2- loosely.  
– Tighten bolts -2- alternately in diagonal sequence to specified  
torque.  
Specified torques  
Component  
Bolts -2-  
Specified torque  
6.5 Nm  
7.10  
Removing and installing glow plug for  
heater - Q9-  
Note  
♦ Glow plug with flame monitor - Q9- is activated immediately  
after activation and switched off again about 1 minute after a  
flame has been detected.  
♦ The maximum glow period for the auxiliary air heater is 150  
seconds.  
♦ When heater unit is switched off, glow plug with flame monitor  
- Q9- is switched back on again during the 4 minute run-on  
time to burn off all fuel.  
♦ It is essential to check the mantle for carbonised deposits and  
damage if glow plug with flame monitor - Q9- is renewed.  
Removing  
– Remove auxiliary air heater ⇒ page 36 .  
7. Auxiliary air heater  
45  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
– Release locking tabs -1-.  
– Swing cover -2- in direction of -arrow-, and detach it.  
– Pull grommet -3- out of lower casing -1-.  
– Disconnect electrical connector -2-.  
– Lever out grommet -4- with a screwdriver.  
– Remove glow plug for heater - Q9- .  
Installing  
Install in reverse order of removal, observing the following:  
Note  
Make sure that the locking element of the electrical connector for  
the glow plug for heater - Q9- points towards the combustion air  
blower 2 - V385- .  
7.11  
Removing and installing flame monitor -  
G64- and combination sensor  
Note  
The combination sensor comprises the flame monitor - G64- and  
overheating sensor - G189- in one component.  
Removing  
– Remove auxiliary air heater ⇒ page 36 .  
– Release locking tabs -2-.  
– Swing cover -1- in direction of -arrow-, and detach it.  
46  
Rep. gr.82 - Supplementary heating  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
– Disconnect electrical connector -1-.  
– Release retaining clip -1- in area marked by -arrows-, and re‐  
move it.  
– Pull combination sensor -2- out of heater unit.  
Installing  
Install in reverse order of removal, observing the following:  
– Rout wiring harness through nearest cooling fin.  
Note  
Make sure not to damage the wiring harness when inserting the  
retaining clip.  
7.12  
Removing and installing combustion air  
blower 2 - V385-  
Special tools and workshop equipment required  
♦ Torque wrench - V.A.G 1410A-  
Removing  
– Remove auxiliary air heater control unit - J604- ⇒ page 42 .  
– Unscrew bolts -2-.  
– Detach combustion air blower 2 - V385- -1- from heat ex‐  
changer -3-.  
7. Auxiliary air heater  
47  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
Installing  
Install in reverse order of removal, observing the following:  
– Renew seal -1-.  
Specified torques  
Component  
Bolts -2-  
Specified torque  
6.5 Nm  
7.13  
Removing and installing heat exchanger  
Removing  
– Removing auxiliary air heater without bracket ⇒ page 36 .  
– Remove auxiliary air heater from plastic housing ⇒ page 44 .  
– Remove auxiliary air heater control unit - J604- ⇒ page 42 .  
– Unscrew bolts -1- from combustion air blower - V6- -2-.  
48  
Rep. gr.82 - Supplementary heating  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
– Remove heat exchanger -4- with seal -3- from combustion air  
blower - V6- -2-.  
Installing  
Install in reverse order of removal, observing the following:  
Note  
♦ Note that seal -3- must be renewed when heat exchanger -4- is installed.  
♦ If heat exchanger is renewed, flame monitor - G64- and overheating sensor - G189- (combination sensor)  
must be transferred.  
– Fit heat exchanger -4- with new seal -3- on combustion air  
blower - V6- -2-.  
– Tighten bolts -1- in diagonal sequence  
– Perform a functional check after completing all work on the  
heater unit.  
7. Auxiliary air heater  
49  
Transporter 2020 ➤  
Auxiliary heater - Edition 04.2020  
Torque settings  
Component  
Specified torque  
4 Nm  
Bolts -1- on combustion chamber  
7.14  
Removing and installing temperature  
sensor - G18-  
Note  
Temperature sender - G18- is permanently installed on auxiliary  
air heater control unit - J604- -1- and cannot be renewed individ‐  
ually.  
50  
Rep. gr.82 - Supplementary heating  

Related Topics

7.1 Assembly overview ? auxiliary air heater 7.2 Removing and installing auxiliary air heater 7.3 Removing and installing air intake silencer 7.4 Assembly overview - exhaust system 7.5 Removing and installing exhaust system 7.6 Removing and dismantling auxiliary air heater bracket 7.7 Removing and installing auxiliary air heater control unit J604 7.8 Removing and installing heater in housing 7.9 Removing and installing burner unit 7.10 Removing and installing glow plug for heater Q9 7.11 Removing and installing flame monitor G64 and combination sensor 7.12 Removing and installing combustion air blower 2 V385 7.13 Removing and installing heat exchanger 7.14 Removing and installing temperature sensor G18

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