any one know what this is i have had a sniff test done on me 1.4 astra about a month ago all was fine. the previous owner of the veh had put k-seal in the engine as there was a leakin the rad but had now been replaced. done a 40 mile journey today and when arrived home the top rad hose blew of the thermostate housing. the system does preasurise a fair bit which was my concern about head gasket. there is no water in oil and no mayo on oil cap. what could this lovley butterscotch sauce be?