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Post by jetjock79 on Sept 21, 2013 18:22:34 GMT -5
Thread started today at 6:45pm Quote Post by jetjock79 on today at 6:45pm Hey everyone....just ran into an issue here with my 250b. She is a 2008, and was bought by the previous owner in 2010. I bought it four days ago, and started a complete fluid change, and overall checkout of the bike. Everything good so far, but had some issues while draining the coolant. Previous owner still had the Chinese cool aid in there, and surprisingly enough, she was running just fine on it. I wanted the real deal coolant, so I began to flush her. Opened the radiator cap (under seat just above the carb.), and then opened the coolant drain on the water pump housing (lower most screw). Fluid came out ok......and then filled her with water. Ran the scoot again with radiator cap off and drain screw screwed back in. I noticed that I wasn't getting anything from the fan turning on, or for that matter,....not being able to add in more water. I then turned the scoot off, opened the drain screw, and then blew out all the coolant/water by using compressed air (from a weak electric blower used to blow up air mattresses) positioned on the radiator fill. Tons of old coolant came out......more than I put in. I then tried to fill the coolant up again, and she didn't take anywhere near what came out. I then started the scoot, and was able to put some more water in,.....but the fan didn't turn on. She just kept climbing up in temperature though. I repeated this process again one more time, and still nothing. Fluid does come out of the drain plug after she runs, but not a lot at all. What's going on here? I know it could the thermostat, but how does the temperature get read on the dash, but the fan not kick on?! Please help ya'll!! Scoot has 1,000 miles. Read more: www.thescooterprofessor.proboards.com/thread/3040/overheating-after-coolant-flush-fan#ixzz2fZYxke19
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2008 Roketa MC54B 257 (10,000 miles and climbing)
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Post by bhinch on Sept 22, 2013 10:04:15 GMT -5
You may want to check the temperature sending unit on the radiator, to make sure the wires are connected. The Chinese coolant may have caused your thermostat not to open. With the radiator cap, which is not on the radiator, off, you should see coolant flowing when the thermostat opens.
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Post by rockynv on Sept 22, 2013 20:41:01 GMT -5
You gotta burp them by gently squeezing the lower cooling hose as you add coolant to get the air pockets out. Some will also have air bleed screws at the high points in the cooling system to assist with this.
Many times the temp sensor for the fan is at a high point in the system and if there is an air pocket at the sensor then the fan won't turn on.
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Post by tamhnguyen on Oct 11, 2013 21:17:10 GMT -5
I had the same problem, when I used the compressed air to blow out the old coolant. overheat and fan will not come on.
The solution was to make sure all the air is purge. by the way be careful not to overfill the reserve tank. I believe that when you overfill the reserve tank, it will not allow are to escape.
Again, make sure that you get all the air out.
Good luck
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Post by DaveC on Oct 11, 2013 22:39:17 GMT -5
1. Remove radiator cap 2. Start and bring to normal operating temp 3. 'blip' the throttle till air/coolant spits out the top of rad 4. watch for coolant flow in rad 5. Replace cap and monitor
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