Yep - the 'Hedgehog' as it is known is more correctly the Final Stage Resistor. This is the device that supplies power at varying levels to the fan motor as determined by the rotary dial on the HEVAC control panel.Hi J. It was Fuse 21, the 40A that I checked and it was fine. I have not got any diagnostics for the L322. What is the hedgehog? Is it 19A874 in the diagram above?
They are known to go bad and either a) the motor is full chat regardless or (more commonly) b) no fan motor at all.
They are also a common cause of battery drain issues.
Relatively easy to get at if you have moderate sized hands and are a bit flexible...if you are neiter, it is more of a faff but still accessable with more swearing and back pain.