Mystery Boil Over - BMW Luxury Touring Community
 
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post #1 of 5 Old Oct 31st, 2008, 10:31 pm Thread Starter
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Red face 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?

Thoughts?
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post #2 of 5 Old Oct 31st, 2008, 10:40 pm
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Re: Mystery Boil Over

I would bet on the pressure cap. The coolant is in a pressurized system and really doesn't "know" what the pressure outside is!

Pad. Gajajiva
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post #3 of 5 Old Nov 1st, 2008, 10:58 am
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Cool Re: Mystery Boil Over

Radiator cap! Sounds very much like what Ernie A. had happen on the Alpine Loop at CCR, and that was the culprit in his situation. Easy enough to change just in case, even if it does not fix it.

John

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post #4 of 5 Old Nov 1st, 2008, 2:51 pm
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Re: Mystery Boil Over

Quote:
Originally Posted by old1951
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?

Thoughts?
Plus 2 on the rad cap! Had the same thing on my 03!

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post #5 of 5 Old Nov 1st, 2008, 3:14 pm
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Re: Mystery Boil Over

Yup.. cap releases when "specified" pressure is reached. IF the cap has some buildup, it could "open" when a pressure is reached and continue to leak pressure if it has junk under the valve.

I'd replace the cap.. look for junk floating. If you have junk floating, a flush may be in order.

If you deide it is a problem with the Thermostat you will have to remove it (big job) then put the old one into a pot of water with a Candy thermometer.. raise the heat until the thermostat "opens", verify it opens at the correct temp.

Do the same with a "new" one BEFORE installation...

...............
J.M.J...
Dcn Channing

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