First of all a hello to all and a big praise to this forum. I have been reading here for a long time and have already found one or other tip. But now it seems that I have to post a problem. The pump named in the title does not work. It is the pump under the coolant tank. We got it, because I get only lukewarm air in the stand gas into the vehicle. As soon as you increase the speed, (be it only to 1000 rpm) the system heats with v after an excursion into the electronics of the Omega and various tested relays we discovered this pump at some point and found that it does not get any power. If you switch it directly, humming it like a bee. We then tried everything as described in various forums, but there is never a signal at the pump. Then we arrived at the point where we don’t know any more. Based on current flow plans we found out that d he pump is directly controlled by the climate control. Therefore the question: Why does the climate control not switch the pump ?