radiator blocked - Kawasaki KLR 650 Forum
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post #1 of 9 Old 12-29-2015, 06:23 PM Thread Starter
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radiator blocked

Hi all,
I have a blocked radiator. I have read all the posts I could find here, very helpful. I have the impeller checked it turns when the engine is running, it won't turn with the engine off. As suggested here, I removed the thermostat and it still over heats quickly.
I took the hoses off of the water pump cover and attached my 120psi compressor to one side of the hose and band clamped it.
At first the air did not blow through, then it started pushing out white colored water and then air. It has now been blown through in both directions but still is tight, meaning, it is not free flowing, still holding a bit of pressure as I let off the air pressure. What could possibly be in the cooling system causing blockage?
Thanks in advance for any ideas.
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post #2 of 9 Old 12-29-2015, 07:25 PM
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Did anything actually drain out when you pulled the plug out of the water pump housing?? Thinking your block maybe empty. If you do in fact have a plugged radiator it's probably best to take it to a shop and have it cleaned professionally.

Might want to read this post and maybe more of the thread. Don't run the bike in this condition.

http://www.klrforum.com/63101-post7.html

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post #3 of 9 Old 12-29-2015, 08:19 PM
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3rdaavbn,
Here is my suggestion before resorting to professional cleaning by a radiator shop.
These aluminum motorcycle radiators are so 'thin-walled' I discourage the use of over-the-counter automotive cooling system flushing mixtures.

You've drained the system, good. You've now got some flow, after compressed air, OK. Now re-connect the hoses. And Re-fill the system with 'Distilled White VINEGAR'.
Stick a piece of cardboard completely over the radiator and go ride it till the temp gauge needle is 'flirting' with the Red Zone. Ride it for 10-20 minutes, flirting with the red zone.

Ride it back to your place and leave it running as you put your glove liners on and your Rubber Gloves ON. Place a ketch bucket under the water pump, and pull the drain bolt from the water pump, with the engine still running! When the drain starts blowing mostly air, kill the engine.

Allow the engine to cool down. Flush with clear water. Re-fill with clear water, take it for a ride. If all seems normal, drain water and re-fill with proper coolant mix.
If still not quite clean, re-fill with vinegar and re-treat the system.
Kind of like, "Lather-Rinse and Repeat if Needed"!

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post #4 of 9 Old 12-29-2015, 08:20 PM Thread Starter
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Yes, there was quite a bit of coolant that drained out before I used the air, about a quart plus. thanks for the reply.
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post #5 of 9 Old 12-29-2015, 10:46 PM
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Don't you have to "burp" the system also?
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post #6 of 9 Old 12-30-2015, 07:16 PM
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Quote:
Originally Posted by mtmedic View Post
Don't you have to "burp" the system also?
I would only 'burp' the system for final coolant fill-up.
No need to burp for vinegar treatment or water only test ride.
Be certain to drain Vinegar or 'Water Only' if one lives Anywhere Near 32 degrees F.!!!!!

Be certain to drain and flush the coolant recovery reservoir and check that Both the Bottom and Top hose 'nipples' are 'open' into the reservoir!

One can start it with the radiator cap off. Then stand the bike straight up off of the side stand. Turn the choke 'off'. Turn the key off. Set it back on the side stand. Top up the system, put the cap back on. 'Burping' done, pretty much just that quick.

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post #7 of 9 Old 12-30-2015, 09:45 PM
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Good info to know, Thanks!
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post #8 of 9 Old 01-05-2016, 07:46 PM
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Quote:
Originally Posted by 3rdaavbn View Post
Yes, there was quite a bit of coolant that drained out before I used the air, about a quart plus. thanks for the reply.
3rdaavbn,
Just a follow up, is your radiator clean yet?

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post #9 of 9 Old 01-06-2016, 02:42 AM
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Was the cooling system working properly before and then slowly went bad?
Did it work one day and not the next?
Is it a used bike that never cooled right?
Nothing normally in the system should turn white. Could someone have played a sick trick and poured something (glue) in the coolant?

What does the radiator look like when you look in the cap with it empty?

What does the water jacket above the head look like when you remove the thermostat and in the hole it come out of?

Try blowing through the engine and the radiator separately to learn which side the blockage is in.

It may help to know that my gen2 with the thermostat removed will pump a 5 gallon bucket full in 2 minutes and 48 seconds at 1,500 rpm and in 51 seconds at 3,600 rpm.
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