Yes fan went on in 10 mins so I can get your tools back to you. Took both hoses off the rad so I could replace the cowl, so lost about 1/2 ltr of coolant. Just thinking that I have water in the header, an airgap at the input hose, water in the rad, an airgap at the outlet hose and water in the block. Just feels to me to many opportunities for an airlock.