Normal function of the cooling system is when it heats the coolant expands and is allowed to leak into the expansion bottle when the cooling system pressure exceeds the pressure cap rating. When the system cools the shrinking coolant should suck coolant from the bottle and therefore maintain the level.
There are two things that usually go wrong - either the head gasket is failing and allowing combustion gas to leak into the cooling system and displace more coolant than is normal due to temperature rise or the pressure cap doesn't have a perfect air-tight seal under the rim so the shrinking coolant can't suck the expelled coolant back from the bottle but draws in air instead.
My first thought is radiator cap. I never had a water cooled bike but on a car radiator cap will open and let the water go to the reservoir tank at a certain pressure. The cap could be allowing the water to run to the plastic tank at to low psi and when the tank fills up it starts spilling out..
SOURCE: 99 DODGE STRATUS RADIATOR OVERFLOW BOTTLE
Double check that your rad cooling fan is operating as it should, but after that, I'd be looking at a good rad flush, or rad replace. Believe it or not, your heater core is like a small rad, and when you turn the heater on, it actually cools the circulating coolant, slighly,and therefore shows a difference on your gauge. Like I said, make sure the rad fan is coming on when engine temperature is at normal or slightly higher, and if it is, then I'd be taking a close look at my radiator, especially if it wasn't replaced when headgasket was done.
SOURCE: coolant light 2004 saturn ion 4 cylinder
I had the same problem. My 2004 Ion had 85000 miles on it. It was a bad sensor. The whole coolant reservoir tank needs to be replaced to fix the problem. This was covered under the extended warranty that we had. If you are doing this repair yourself, a hose clamp tool is recommended for simplicity.
SOURCE: 95 honda civic lx overheating
COULD BE COOLANT SENSOR,HEAD GASKET,CHECK THE TIMING,THE PROPER MIXTURE OF COOLANT,WATER PUMP.DID YOU HAVE IT CHECKED OUT?ANY LEAKS?HEAT WORK WITH FAN?
SOURCE: where is the thermostat in a 900s oh. 97 saab 900S
Oil change interval has nothing to do with operating temperature. If your coolant is full, feel the upper radiator hose, when the vehicle is up to temp. if cool , thermostat is back from that hose,
Look for air bleeds, and read owners manual, some cars have coolant bleeds. Also, heater on high when filling coolant or risk bubbles...
My thought is that your fans may not be kicking in. They should cycle on and keep temp low enough. test them.
SOURCE: coolant blowing out of radiator into overflow bottle at start up.
Typically would not overheat until enough coolant was lost. Find out if they mag fluxed the heads, or had it done. A lot of shops rebuild without doing this step as it's expensive. If they got a rebuilt head, again they need to know if it was mag-fluxed.
It's harder to mag flux the block while in the vehicle and assembled.
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