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 approx. 10 °C.

The ambient temperature switch -F38- with bracket -arrow- is located at front left in the plenum chamber (part number 701 959 625) or, on more recent vehicles, behind the wiper motor.   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-). –  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 2nd heat exchanger. Briefly press the switch for heating, temperature control switch and timer -E13- (button -1-). –  Set 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. –  Read fault memory again using vehicle diagnosis, testing and information system -VAS 5051A-.   Note The auxiliary heater is OK if no fault code appears. –  The ambient temperature switch -F38- must be reconnected in the vehicle with a diesel engine and attached in the plenum chamber.