Help have problem and warning light came one saying low water level. I stoped at garage about 100 yards away then it spat all it's water all over the floor the top rad hose was like a balloon let it cool down. The temp gauge never went above half way so it did not over heat put water in got home and warning came on again. Let it cool down filled it up with water bled the system took it for a run got back and the top rad hose was pumping like a hart about 3pm across I think it could be water pump or thermostat what do you think. It's only done 80000 with full service history can you help please thanks wayne