Join Date: Jun 2008
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Check that your fins are not bent. You should not need to take it apart to wash the rad, wash it out from the back side first to push out the mud back out, as it will be stuck in the front. Then back and forth from front to back to get it all. You should be able to see through it/ shine a light through it without a problem when it is clean. Remember to soak it, if its plugged with thick clay, hose it down with water, let it sit for a few minutes, do it again, again, etc to let the clay suck in the water and loosen itself up.
If the light came on after it was off for a few minutes, it means the engine was close to overheating, but not there yet. When you shut it off, the coolant stopped flowing, thus the coolant sitting in the hot engine head only got hotter, then when it started circulating again, this hot coolant goes past the temp sensor and reads as being too hot, throwing the light on.
If you know the grizz is running close to being over heating/ have been working it hard like you did, after you shut it off its a good idea to turn the key on and let the fan run for a 30 seconds or a minute, then start the grizz for a minute to let the cooled water circulate again, then shut it off. Depending on how much work ya did, and how much more you will be doing, and how long you will be sitting for, you could do it a few times to help cool down the whole engine.
X2 on checking your coolant level! If the light only came on after, i doubt ya boiled any over, but its always good idea to check!