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Interpreting Coolant Testing Strips

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Old Jun 29, 2025 | 10:45 AM
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Interpreting Coolant Testing Strips
I flushed my coolant in summer 2019. Wow how time flies. I used Fleetpride or some such thing brand that from a large truck parts chain.

Anyway I checked with coolant test strip and after 90 seconds it clearly showed I'M DUE for a flush...



Then I look at the strip this morning and it has changed:



Does interpretation need to happen within just a few minutes?
 
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Old Jun 29, 2025 | 12:08 PM
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It should say on the directions before I changed from the green coolant to ELC when using the fleet guard said take reading within x amount of seconds
 
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Old Jun 30, 2025 | 09:35 AM
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It says to wait 90 seconds but doesnt say if the color continues to change after 1 hour or what have you.
 
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