Hello together, I have a rather urgent problem with my parents’ Volvo V40. Since yesterday the fan or the interior fan no longer works. 1. guess: fuse. I checked. 100% OK (because it is the same for the disc heating and this works or does not work if the appropriate fuse is missing). 2. guess: blower motor defective. Plugs pulled and bridged with a 9V battery (unfortunately nothing else…). Blower ran, although only very weak because of the battery, but it ran. Then measured the plug with a voltmeter. Ignition off -> 0.00V; ignition on -> 0.30V; No change if I have “regulated” on the fan controller. 3. guess: the two plugs next to the fan plugs put in any relay or something like that (which I believe belong to the fan control) both plugs individually pulled off and all contacts (1x 3 and 1x 4) measured. Sometimes there were 0.00V and sometimes 11V. But there was never a change when I turned on the fan controller.