Coolant change and flush - Chevy Colorado & GMC Canyon
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post #1 of 4 (permalink) Old 11-21-2016, 07:08 PM Thread Starter
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Coolant change and flush

I just did my first coolant change on my 2008 Colorado I5. I followed the directions in my Haynes manual and all went well. The only thing is when I went to re-fill it only took 6 litres instead of the 10 required. I've put about 100 km on it and runs fine, took a little bit from the reservoir and its still full. So I'm thinking there must be coolant stuck somewhere that didn't drain. I was just reading another how to and they said to loosen the thermostat housing to drain the block. I didn't do this as its not a step in the manual. So after flushing and re-filling, the stuck 4 litres must be water from the flush, and when re-filling with 50/50 dexcool, this would dilute the mixture to maybe 60 water, 40 dex. Does this make sense? Does anyone see a problem with this? Fortunately in this part of Ontario we rarely get temperatures below -20 C.
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post #2 of 4 (permalink) Old 11-21-2016, 08:06 PM
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The heater core would hold some coolant, I don't think you need to worry about it, you should be good as long as you got the majority of the old antifreeze out. If you're concern with the concentration level you can grab an Antifreeze Tester, they are not expensive.
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post #3 of 4 (permalink) Old 11-21-2016, 08:45 PM
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You never get it all out when you do a drain of the system, even if you did loosen the thermostat housing. In the future, if you do flush and have nothing but clear water that ran though your system, fill half the system with pure Dexcool first (in this case, 5 liters.....whatever that is, you crazy Canadians) and then top off with water. That way you will hit your 50-50 mark.

2005 5 cyl, Black on Black, 4 door
2016 Z71, Black, Long Box, 4 door
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post #4 of 4 (permalink) Old 11-22-2016, 06:26 AM
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Not sure what procedures the Haynes manual suggests. If you drained the coolant, refilled with clean water, operated the engine until warm and then drained again, all of the antifreeze would be out of the system. The fluid remaining in the system would just be water. The normal procedure would be to calculate the required amount of coolant needed and add that the the system prior to topping off with water. The 50/50 mix is usually not used for flushes.

You should be able to find an antifreeze tester, fairly cheaply, at most any auto parts store:
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