Join Date: Nov 2002
Location: Mission Viejo, CA, USA
Mystery Boil Over
Returning home from CCR I experienced a coolant boil over problem for the first time in 80K miles on the 02 LT. The bike ran terrific for the 2-week (3,800 mile) trip to and from CCR. But in Steamboat Springs and over Rocky Mountian NP I discover that the coolant in the overflow tank was a roaring boil and peeing out over the pin hole in the overflow tank cap? Neither the temp guage or the "hot" idiot light indicated that the bike was overheating. The next days trip from Leadville (10,200') and over Independance pass (12,095') into Aspen failed to reproduce the problem and there was no indication of boiling crossing the Mojave Desert at 107-110F coming back into Southern California? I've checked the fans and they both work fine in the driveway and out on the local roads. The coolant was new at the 72K service and had been run for about 4K miles prior to the trip. I was wondering if anyone has experience a similar issue?
Only two scenerios come to mind. One, the pressure cap is tired (its original) or, two the lower boiling point at 12,000' (approx. 188F) was too low to trigger the fan temperature switch and the fans just never came on in the heavy traffic of the park. It was hard to tell with gloves on in bumper to bumper traffic in the hairpin turns of Rocky Mountian NP.
I'd love some input. I feel stupid for not being able to nail down the problem, but I can't seem to recreate the problem now that I'm home?