Volkswagen Tiguan Service and Repair Manual: Auxiliary Heater Heating Element -Z35-, Checking

Checking the Auxiliary Heater Heating Element -Z35- with Peripheral Components:

The Auxiliary Heater Heating Element -Z35- with peripheral components (load signal for generator terminal DF, Low Heat Output Relay -J359-, High Heat Output Relay -J360-, Intake Manifold Temperature Sensor -G72-, Engine Coolant Temperature Sensor -G62-) can be checked using engine control module OBD.

Auxiliary Heater Heating Element -Z35-, Checking:

Special tools and workshop equipment required

• Vehicle Diagnostic Tester with Vehicle Diagnosis System - Trigger Clamp - 100A -VAS5051B/7-

• The intake temperature is below 19 ºC (66.2 ºF).
• The coolant temperature is below 80 ºC (176 ºF).
• The passenger compartment temperature is approximately 20 ºC (68 ºF).
• Battery voltage greater than 11 V
• Alternator load not greater than 50 % (terminal DF)
• Engine speed higher than 450 RPM
• Turn the interior temperature knob to maximum heating.

• Remove the left footwell vent.
• Remove the left footwell center console trim panel.
• Measure the current draw at the ground wire -arrow- using the Vehicle Diagnostic Tester and the Vehicle Diagnosis System - Current Clamp - 100A -VAS5051B/7-

Small heat output ≈ 30 amp

Medium heat output ≈ 60 amp

Large heat output ≈ 80 amp

Auxiliary Heater Heating Element -Z35-, Removing and Installing

Special tools and workshop equipment required

• Vehicle Diagnostic Tester with Vehicle Diagnosis System - Trigger Clamp - 100A -VAS5051B/7-

Removing

• Disconnect the battery.
• Remove the footwell cover on the driver side.
• Remove the left footwell vent.
• Remove the bolts -A- (1.4 Nm) and the cover -B-.

Cover

Note

• There are different version of the cover -B- (vehicles with or without an electric auxiliary heater). Refer to the Parts Catalog.
• If the temperature door lever -C- is at a position that hinders access to the upper screw -A-. Change the position of the temperature door using the hot and fresh air controls; on vehicles with Climatronic (e.g. "Hi" setting). Disconnect the battery again.
• Remove the nut -A- (tightening specification 9 +-1 Nm).
• Disconnect the connector -B- from the Auxiliary Heater Heating Element -Z35--C-.

There is a risk of burns by the metal surfaces of the auxiliary heater heating element. Heating elements can be very hot.It is possible for the skin to be burned.Wear safety gloves.Never touch the metal surfaces of the heating element.

• Remove the Auxiliary Heater Heating Element -Z35--C- from the heater and A/C unit.

Installing

Install in reverse order of removal.