Opel Omega and Opel Combo

Hello you. I’m new here and have two problems at once. First my Combo Bj.1997. I bought the car from my boss. I had to put a new battery in because my colleague got him on the construction site no more. He drove also 2 days without problems -.-until today. My wife stood on the way back from work in front of the bench and he didn’t jump on. I had to come and give her starter help. Starter spins 1-2 times, that’s nothing more. Can you help me? Problem car 2. My Opel Omega A Caravan. For some time he got hot (110*c) and I always had to refill cooling water. Now the engine goes out after some time.