Heater booster does not start, function

GF83.70-P-3046B

2.4.98

MODEL 202 with ENGINE 611.960
with heater booster

MODEL 210 as of 1.6.98 with ENGINE 602.982
with heater booster

MODEL 210 with ENGINE 611.961
with heater booster

P83.70-0414-09

2 Heat exchanger

A1 Instrument cluster

M13 Coolant circulation pump

S4/3 Heater booster switch

A6n1 Heater booster control module

G2 Generator

Function sequence

1 The vehicle engine is started. The coolant circulation pump (M13) pumps the coolant through the heat exchanger (2). Positive voltage from the generator (G2), circuit 61 (charge indicator) is connected to the instrument cluster.

2 Heater booster switch (S4/3) in position "heater booster on", red LED in switch not burning.

3 The instrument cluster recognizes that the engine has been started and checks the temperature of the coolant and outdoor air for operation of the heater booster.

4 Coolant temperature > 73 °C

Outdoor air temperature  8 °C

Coolant temperature  73 °C

Outdoor air temperature > 8 °C

The instrument cluster recognizes from the temperature of the coolant that operation of the heater booster is not required. The heater booster control module (A6n1) is not actuated by the instrument cluster.

5 The coolant circulation pump (M13) pumps the coolant through the heat exchanger (2) with the heater off.

	Heat exchanger, location/purpose/design	GF83.70-P-4001A
	Stationary heater/heater booster control module, location/purpose	GF83.70-P-4002A
	Heater booster switch, location/purpose	GF83.70-P-4052A

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