HVAC - Auxiliary Heater Shuts Down Prematurely Auxiliary air heater (H11) shuts down pre2010

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Technical Service Bulletin # LI83-70_N-048692 Date: 100204
HVAC - Auxiliary Heater Shuts Down Prematurely
Auxiliary air heater (H11) shuts down pre2010
Mercedes Benz Truck Sprinter 2500 Panel (906.635) V6-3.0L DSL Turbo (642.898) Copyright ? 2013, ALLDATA 10.52SS
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maturely after operating for a short time.
Topic number LI83.70-N-048692
Version 1
Design group 83.70 Stationary heater, auxiliary heater
Date 02-04-2010
Validity Sprinter 906.** Auxiliary air heater (SA code H11)
Reason for change
Reason for block
Complaint:
The auxiliary air heater shuts down after operating for a short time although the vehicle interior is not yet warm.
Cause:
1st possible cause:
The warm air from the outlet of the air duct under the driver seat to the passenger compartment is drawn back in by the intake of the auxiliary air
heater. This warm air suggests to the temperature sensor of the auxiliary air heater that the vehicle interior is already warm. Therefore, the auxiliary
air heater shuts down.
2nd possible cause:
Wrong version of air duct for auxiliary air heater (part number A 906 830 10 23, attachment 2) installed.
Remedy:
Re. possible cause 1:
Close off the warm air outlet under the driver seat (H00) (attachment 1). Note: The two bars in the air outlet under the driver seat must be removed.
Mercedes Benz Truck Sprinter 2500 Panel
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Mercedes Benz Truck Sprinter 2500 Panel
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Mercedes Benz Truck Sprinter 2500 Panel
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Mercedes Benz Truck Sprinter 2500 Panel
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Mercedes Benz Truck Sprinter 2500 Panel
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Mercedes Benz Truck Sprinter 2500 Panel
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Re. possible cause 2:
Install the standard air duct for H11, part number A 906 830 09 23.