Coolant bottle level?
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Tourer
Joined: May 2024
Posts: 316
Likes: 149
From: Marysville WA
Coolant bottle level?
Random question. on hot days when the fans come on, even when the bike is at 235 ish and ambient is around 80, the coolant level in the bottle never goes above the cold mark. would have figured it would expand some....... does that jive with what everyone else is seeing?
Seasoned HDF Member
Joined: Jan 2008
Posts: 13,672
Likes: 11,459
From: State of Confusion
Random question. on hot days when the fans come on, even when the bike is at 235 ish and ambient is around 80, the coolant level in the bottle never goes above the cold mark. would have figured it would expand some....... does that jive with what everyone else is seeing?
Novice
Joined: Jun 2021
Posts: 20
Likes: 28
From: Florida
My understanding on how to read the level is to remove it from its bracket and hold it upright . You’d think that it would be read while in the bracket and on the jiffy stand but that’s not what the manual says. It makes a big difference in the reading .
Stellar HDF Member
Joined: Jul 2021
Posts: 2,099
Likes: 2,107
From: NoVA
Road Master
Joined: Mar 2009
Posts: 765
Likes: 49
From: New Jersey
My coolant level was at the lower marking for cold so I added 1oz of water wetter and now its a hair below the upper marking. Today between 80-85 degrees the engine temp stayed between 210-217. When the ambient temp got up to 94 degrees the engine temp was 221-228 and hit 231 while stuck stopped in traffic.
Road Master
Joined: Feb 2012
Posts: 800
Likes: 408
From: Middle Tennessee
I rode yesterday and interstate air temps were as high as 98 degrees. The bike once ran up to 231 but usually ran in the mid 220's. My coolant level has never changed and sits just above the cold line, mounted in the bracket while hot or cold. I touched the reservoir about 15 minutes after running and the reservoir was barely warm. I'm not sure the coolant goes into the reservoir unless the bike is overheating.
I believe total system capacity is less than a quart.
I believe total system capacity is less than a quart.
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Joined: Jun 2024
Posts: 58
Likes: 50
From: St George, Utah
I have both a 24 Street Glide and a 25 CVO ST, and both routinely run over 230F on warmer days. In fact, the CVO has seen 255F when idling in 95-100F...the coolant levels on both bikes have been consistently around the middle of the overflow tank. My dealer said that those temps are normal and that the reading on the dash comes from the rear head, not the coolant temp. This makes sense as the coolant would be overflowing at those temps, so I don't worry about it anymore.
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