Does this sound familiar to anyone? (03 Multipla 1.9 JTD) a few months ago on the motorway the heater got a bit cool, then the warning came on. Called out the RAC but by then all was normal. Got home and had the car checked out and a new thermostat fitted. All was well for a while, now it's back. Usually when it's working hard up a hill, the warning light suddenly comes on and it beeps to stop immediately. Switching off and back on cures it and the temp guage comes down to normal. The mechanic from the local garage got it to do it but said the engine was not hot so it's a sensor guage thing presumably. His diagnostics couldn't find a thing, he's as confused as I am. Help. I love my car but there are a few niggles spoiling it for me, the airbag warning is always on too. Simon