had timin belt done 2 weeks ago went wales bank holiday Monday bout 90 miles round trip and had coolant level low had to put nearly 2 liters water in as didn't have antifreeze its been there or there abouts since ive been bak level bak at max from wales should I be worried as never had to top up that much only had it 6 weeks and warrenty runs out in another 6 weeks so need to no thanks