RE: 2001 S60 non turbo (sorry for duplicating on the S60 section, but the same engine...)

Yesterday after stopping for a 1/2 hour, the temp gauge jumped into the red zone and got a message saying stop engine.
we towed the car home, bought a new coolant sensor and a new thermostat.

However while draining the coolant, I noticed that it was not really hot as stated on the gauge and even after leaving the engine off for a few hours the gauge still jumps into the red zone, even with the new temperature sensor (on the thermostat housing).

It is possible that my son car has second temperature sensor besides the one on the thermostat? I have to stop at the Volvo dealer after work to buy a new drain plug (yes, I over tighten the old one...),is there something else I should buy?

Thank you in advance for your comments!

 

two things to try - if you can access an OBD2 code reader, try clearing all codes and see if that resets the error message. After that, I'd check the connector for a possible short - ie the signal wire (green/red?) to ground - you should check at the connector and at the ECU. Check out volvowiringdiagrams.com to see the wire colors and pins on the ECU