At 03:09 PM 5/25/2010, neil n wrote: >I'm curious. As coolant mix gets old over time, would the change in >coolant chemistry affect conductivity of coolant? Maybe. My guess is not much. > i.e. would a light >taking longer to turn off be a pre cursory warning that the coolant >needs to be changed? No, it doesn't work that way at all. Blink timing is *entirely* controlled by the internal gauge circuit -- each time the light is triggered it should run about three seconds. Taking longer to turn off is a preliminary warning that your gauge will need to be opened soon. >And, if one has added too much water, would a >mixture that's water rich cause the light to blink constantly? The controller will trigger if the resistance it sees is above about 180 K ohms. Depending on how pure your water is you might possibly exceed that, but not if your concentration is anywhere remotely near 50 per cent -- which is where it should be at all times unless you're actually in true Arctic conditions (below -35F). At all other times including in the boiling desert, 50% is what VW specifies and what makes sense. Yours, d |
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