I have a 15" pusher fan from a '79 BMW. It was/is a 2 speed fan, however I just use the high speed when I need it. It moves an amazing volume of air! You can get a temp. sensor that is adjustable from Hayden(I can give you the part # if you need it) For about $75-80. I put it in the thermistat housing and it semed to work great. The controller burnt out after about a year though, not sure why , but the fan does draw about 25 amps under load! The fan is only about 1,1/2" wide, so it takes up very little room.