Automatic heater (HEAT) diagnosis operational check · ad8325p3000a · Mercedes-Benz WIS

AD83.25-P-3000A

Automatic heater (HEAT) diagnosis operational check

6.11.97

MODEL 170 except CODE (580) air conditioning, or for USA, Tempmatic

	Automatic heater (HEAT) diagnosis, basic knowledge		AD83.25-P-2000A
	Prerequisites for function check, HEAT		AD83.25-P-2000-09A
	Function check
Test step/Scope of test	Operation/Requirement	Specified value	Possible cause/Remedy
1 No heat	 Selectors on "blue" (engaged)	Air outlets, unheated air	AD83.25-P-6000-14A AD83.25-P-6000-14B AD83.25-P-6000-14C AD83.25-P-6000-15A AD83.25-P-6000-16B AD83.25-P-6000-17A AD83.25-P-8000A
2 Full heat	 Selectors on "red" (engaged)	Side outlets, heated air Center outlet, unheated air	AD83.25-P-6000-16B AD83.25-P-6000-17A
3 Recirculated air	 Selectors in any position  Recirculated air button pressed (LED illuminated)	Volume of air from center outlet increases significantly.	AD83.25-P-6000-05A AD83.25-P-8000A
4 Normal setting in control mode	 Set preselected temperature to interior temperature	Center outlet, unheated air Other air outlets, temperature-controlled air outlet At the same time the duo valve (Y21) cycles and the coolant circulation pump (M13) runs.	AD83.25-P-6000-16B AD83.25-P-6000-17A AD83.25-P-6000-05A AD83.25-P-6000-05B

ad8325p200009a HEAT preconditions for operational test
ad8325p2000a Automatic heater (HEAT) diagnosis previous knowledge
ad8325p600005a HEAT test of electrical system heat exchanger temperature sensor
ad8325p600005b HEAT test of electrical system heat exchanger temperature sensor
ad8325p600014a HEAT test of electrical system pushbutton control module
ad8325p600014b HEAT test of electrical system pushbutton control module
ad8325p600014c HEAT test of electrical system pushbutton control module
ad8325p600015a HEAT test of electrical system blower controller
ad8325p600016b HEAT test of electrical system duovalve
ad8325p600017a HEAT test of electrical system fresh air / recirculated air flap switchover valve
ad8325p8000a Automatic heater (HEAT) test of pneumatic system