The coolant level is fine. After reading more posts at different threads on coolant sensor light staying on my husband discovered that the radiator fan fuse was burnt. When he took the other 50 amp fuse (traction fuse) and placed it in the radiator fuse position, the low coolant light went off. But when he started the car again, that fuse blew. So now we have to buy 2 50 amp fuses. He also cleaned the fuses for the electric seats, replaced them and they worked temporarily, then stopped again. Any ideas? I know this probably needs to go in a different thread.