Just wondering if anybody can help me, Please! My friend has a 2001 ford fiesta and had a water leak on it yesterday, so we put some radiator weld in the expansion tank and seamed to fix problem. Now he has no heaters inside the car whatsoever although the car is warm and there is water in the expansion tank for the radiator. I think its the thermostat, but not 100% sure (I'm no mechanic) just wondering if somebody could confirm my suspicion and tell where abouts on the engine the themo would be located, thanks in advance. Neil