This was one time when you couldn’t say the customer hadn’t been patient and understanding. After several trips to the dealer and a visit to our host shop, we hadn’t been able to locate the source of the elusive coolant leak on her 1987 Volvo 760’s V-6 engine. It’s not that anyone was trying to question whether there really was a leak. The slow but steady loss of coolant from the cooling system made that kind of denial impossible.