Testing the Heater Unit

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Diagnostic trouble code (DTC) HEA-898 is set in the control module to ensure that the heater is tested at the factory before the car is delivered to the customer. In other words this diagnostic trouble code (DTC) cannot be set by the control module itself, only by the manufacturer. The diagnostic trouble code (DTC) is automatically erased at the factory when the unit is tested. When the unit is installed as a replacement part, the diagnostic trouble code (DTC) must be erased manually after the heater has been tested in the car.

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition on.
Activate heater.
Check heater function according to Test Driving Of Additional Heater/Parking Heater

Fig 2: Identifying VCT2000
Courtesy of VOLVO CARS OF NORTH AMERICA.

Does the heater function?

YES
Refer to Information
NO
FAULT NOT FOUND: Troubleshooting has been completed.