I cranked a car over last week that sat with the same fluids for 3 years. The only problems were water in the combustion chambers and 3 gallons of oil. Won't keep running long enough to worry about the coolant.
2000 Contour SE 2.5L ATX - Toreador Red
2001 VW Golf GLS 2.0L MTX - Tornado Red
Buy my possessed VCR!!