Mbart04

Yeah there is a cap on the overflow tank with a overflow pipe and a pressure cap on the radiator. Where your systems the same? Yeah I'll give it try see what happens never know

Thank you, is that the on the tank or one on the radiator?

Hi, I have a lexus is200 52 plate. Aslong as the overflow tank is full it run fine and stays at temp, but when Check the overflow tank after going anywhere it's almost empty( take just under a litre). I have plugged it in and it come up with fault code p0115"engine coolant temp malfunction" while plugged in I noticed that them temp sat at 70-80c but when ignition is off it drop to -50 any ideas where to start. Engine temp sensor, thermostat? Many thanks Matt.

Hi sorry didn't know where else to ask this. I have a lexus is200. Aslong as the overflow tank is full it run fine and stays at temp, but when Check the overflow tank after going anywhere it's almost emty. I have plugged it in and it come up with "engine coolant temp malfunction" while plugged in I noticed that them temp sat at 70-80c but when ignition is off it drop to -50 any ideas where to start. Engine temp sensor, thermostat? Many thanks Matt.