Temp warning system Volvo 240 (B230(FJ)

A warning lamp that lights up late or an turn signal that jumps can point to a tired temperature sensor or poor contact in the circuit – both are common checkpoints on the 240 with the B230F engine. This category gathers the parts that keep temperature monitoring reliable on the four-cylinder OHC engine. The group includes temperature sensors, diodes, nipples and grommets, meaning both the measuring point in the cooling system and the small components that route the signal onward. When troubleshooting, the sensor's resistance and the sealing nipple should be checked before condemning the gauge. Since the design can differ between model years, it is worth comparing the connection and placement against the existing part before replacement.