So now I want to finally start the project summer lie on the XC90. Since this unfortunately does not work as standard, the “Bastler” has to answer again. Who knows my projects, knows that I switch on the stand heating in the XC90 in winter with my GSM switch. Thus, it is possible to use this also for the summer ventilation. In winter I had already provided the contacts, cables and switches. The problem is to blow the hot air out of the car. Unfortunately this does not work with the serial blower That’s why I want to build 12 volt fans into the exhaust openings of the car to suck the warm air out of the car. I want to install two suitable PC fans (good Pope fans) into these outlet channels. The fans have up to 4 watts together and thus do not suck the battery empty even at an hour’s run. My concern is that the air of course also has to flow back in from the outside. I wanted to switch off the circulating air function first. Thus, air must flow in from the outside. the two fans will be able to significantly lower the temperature in the car? At the moment I haven’t started and I want to hear your opinion first. All parts are ready. First a few pictures are available. You can see the outlet channels on the left and right. The extended channel with a fan (both channels are not the same size and therefore require different fans). However, the channels still have to be sealed. Behind the channels are louvres that only I’m looking forward to your answers. Ciao, xc90newbie.