I have a 2l petrol suzuki grande vitara and it started overheating only when driving 4 or 5 days ago.
I changed the thermostat today as it was taking a long time to warm up but when you drive it 3 miles the temp shoots up to the red and the water is bubling out of the water top up bottle.
Could it be the water pump and if so how do I check .
No sign of gunk in the oil or oil in the water ?.
I am going to pressutre test the cylinders tomorrow but dont understand why the water is escaping from the top up bottle.