The $1000 and up machines? Where do the hook up to a vehicle and does the thermostat need to be removed first? Can I make a machine with a small electric pump and 2 five gallon buckets. Considering changing coolant types and want to get all old coolant out. A used machine on EBay is as low as $400 and that is what a dealer charges and not sure dealer would use distilled water. Considering this for pickup.