Mysterious Coolant Leak
I have a 2002 Vulcan with 140,000 miles. It has developed a coolant leak that I can't seem to find. It is in the vacinity of the water pump, but when I go looking for the leak, I don't see any evidence on or around the pump. I've been putting a drip pan under the car at night and some times I get some coolant in the pan and other times I don't get any coolant. The other day my son was driving the car when enough coolant escaped to cause the serpentine belt to slip. Unfortunately, my son has a 35 mile one-way commute to work and by the time I could examine the car, I couldn't find any leak. The only coolant I found was a very small amount on the connector for the crankshaft sensor and on the coolant hose going to the top of the expansion tank.
The water pump is the original and I have Bars Leak tablets in the cooling system.
Any thoughts as to the leak?
1992 Gen 2 Vulcan (sold at 232,000)
2002 Gen 4 Vulcan 209,000
2002 Chev Suburban 157,000
1981 Mercedes 300SD 289,000
1982 Mercedes 300SD 307,000