From what others have said I think it should start on low then switch to high. But to be honest I've never pulled the plug to test it myself.
If when the plug is pulled there is just a delay then the high speed fan, then yes it still points to a faulty low speed circuit.
I thought he also said the fan runs for the AC, which will be the low speed. But reading it again he may have actually said he SWAPPED the fan relay with the AC.
Ok, now im confused about the fans. I have one fan on the radiator. And the heating is working, but ac pipes are bust, so it is not really working - if i press the button green light of ac lights up, but there is hardly any sound, i can hear it, but its really silent.
And yes, i tried to swap the relays around to check if they are working, all the red ones seem to be 12v30 and all seem to work, but probably should do the test with 12v souce and wires, sadly dont have any spare aligator clips, so cant do it that way. And im not sure both 12v50 are working.
I did the emergency test like this - unhook the temp sensor cable and then start the engine. I think it starts in fast mode, because the resistor is not present. Without the resistor there is no low mode, right? I want to kill the previous owner (joking), just found a cut wire inside the car behind the radio, but i doubt it is connected to the fan. Now to find out what it is for