SEAT Workshop Service and Repair Manuals

Road test for auxiliary heater in vehicle without Climatronic   Note In a vehicle with a diesel engine, pull the ambient temperature switch -F38- off the connector housing and electrically bypass the contacts of the connector housing. Otherwise the auxiliary heater will not start at temperatures above 5 °C.

Ambient temperature switch -F38- with bracket -arrow- (part number 701 959 625)   Note In vehicles from model year 10.1998, the wiper motor must also be replaced → Rep. Gr.92.

–  Set fresh air blower switch –  Turn rotary knob for temperature flap -1- clockwise to stop.

–  Turn rotary knob for flap position -2- clockwise to stop.

–  Switch on auxiliary heater using pre-selection clock -E111- in moulded headliner. Press button -1- briefly. Symbol -2- for immediate heating appears. In the engine compartment, the vacuum-controlled valve -arrow- blocks the coolant circulation through the radiator (controlled by the coolant circuit valve -N214-).   Note t  Coolant is pumped through the auxiliary heater. The continued coolant circulation pump -V51- pumps in the vehicle with engine codes: ACV (TDI) or AES (VR6). t  The additionally installed circulation pump -V55- pumps in vehicles with other engines t  Combustion air blower -V6- and glow plug for heater -Q9- start after 6 seconds. Metering pump -V54- pumps 20 to 60 seconds later. Flame monitor -G64- detects the flame. Full load operating mode starts.   Note t  The preheating time finishes after approx. 30 minutes. The heating enters the run-on phase. t  The heating continues to operate when the engine has started.

–  Start engine.

–  In the engine compartment, the vacuum-controlled valve -arrow- opens the coolant circulation through the radiator (controlled by the coolant circuit valve -N214-).

–  Switch on the 2nd heat exchanger (briefly press the switch for heating, temperature control switch and timer -E13-). –  Switch on high temperature and blower speed on warm air blower switch -E100-. –  Run the engine to warm it up. –  Wait for several control processes to be completed. –  End the road test. –  Wait for auxiliary heater run-on phase. –  Perform diagnosis again with diagnostic tester → Chapter.   Note The auxiliary heater is OK if no fault code appears. –  Top up coolant circuit again → Chapter. –  The ambient temperature switch -F38- must be reconnected in the vehicle with a diesel engine and attached in the plenum chamber.