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My van is loosing water very slowly and i can't see a leak

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Vans are always a problem as they have limited visual accessibility.
Water leaks occur commonly, although most are usually easy to find. You aren't saying just how slowly the leakage is, but anything that only requires a reservoir top-off once a month or so will be very hard to find. One leak source that can be difficult to see are from the water pump weep hole. This hole is designed to let water leak out when the pump is getting on to the end of its life. This is to tell you it's time to replace the pump. Unfortunately, some pumps are very well hidden, and in some cases the water that leaks out will fall on the engine block and evaporate before hitting the ground. Seepage around hose clamps is also a possibility. Another potential issue could be the heater core going bad. They are hidden in the passenger compartment. There are two relatively easy ways to find small leaks. The first is to go to an auto parts store and get a coolant leak detection kit. It will have a bottle of fluorescent dye that goes into the radiator. Then after a few days, you can, in the garage or in the early evening when it starts getting dark out, use the detection flashlight to look for luminescent trails from the water leak. If that doesn't work, most shops will do a pressure test of your cooling system using a similar dye tracer for a reasonable fee.

Posted on Dec 04, 2016

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