The red coolant / thermometer light is your last warning before a head gasket failure. Continuing to drive can warp the cylinder head and write off the engine. The cost of pulling over is zero. The cost of ignoring it is £1,500–£4,000.
Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].