Checking the Operating Thermostat

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.

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Disconnecting Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off.

Fig 3: Identifying Ohmmeter
Courtesy of VOLVO CARS OF NORTH AMERICA.
- Remove the 8-pin and 2-pin connectors from the control module (terminal 9, 10)
- Remove the heater fan shroud
- Remove the combustion unit
- Check that the temperature of the thermostat is below 55°C
- Connect an ohmmeter across both operating thermostat terminals.
Fig 4: Identifying Thermostat
Courtesy of VOLVO CARS OF NORTH AMERICA.

The ohmmeter should read approximately 0 Ω.

OK
Refer to Checking the Operating Thermostat Wiring
NOT OK
Refer to Replacing the Component