Hello, the R19 electrventilator works through a thermocontact that is located, if not m mistake, at the bottom of the water radiator, which can be depending on whether the electro -ventilator has one or two speeds, two or three cables. The way of checking it is as follows: the first thing is to see if Tension +12V arrives at one of them, if it does not arrive it is a fuse, if it arrives, in the 2cables you must bridge the two cables, if I bridge the problem works it is the thermocontact, if I bridge do not function you must look for the relief and check it, but I think that you have already done it and it works. In the 3 it is the same, one of them has to have +12V, if you have it to bridge between the cable with positive and one of the others and a fan rotation speed must work, and if you bridge the other the other speed will work, if bridge works, the problem is the thermocontact.
I hope it helps you, greetings
