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Look in this area with a clean spot and it appears wet behind it. Check around this area, thermostat housing, coolant hoses etc.If you still can’t find the leak, you can get a coolant leak detection dye and a black light. Just add the dye to your coolant, drive the car around until you get to operating temperature and shine that black light in there. The dye will glow bright nearest to the leak and leave a trail to follow to the leak.