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Discussion Starter · #1 ·
Looking at the way the coolant level sensor has been bypassed over the years has always struck me as not great. Let me say this now, I am not trying to start a debate on safety, necessity of the sensor, warranty voiding, etc. I want to share what I've come up with and am curious if anyone else is as well.

I look at car parts from the stand point that if it did not have to be there for some reason, it would not be there. Sure a part may only be a couple $ but multiplied by all the cars made plus the labor, it costs to have it.

So here is how I see it:
-The sensor needs to be there, it serves a necessary function
-It is far too sensitive
-When it false triggers, its expensive to undo
-There are implications to voiding of warranty
-There are risks to starting a fire
-Solution needs to be functional, not false trigger and be stealth

After thinking about it, I decided to buy a sensor, cut it open and play with it. First plan was to bypass it internally and clean up the outside so it looks like it was never modified. While I liked this a great deal, there is the implication that if the coolant did leak out, there is still a small possibility of a fire. The nice thing is that it could be blamed on a faulty sensor.

I thought more about it and came up with a different solution. Since im already inside the sensor, what would happen if I put a timer circuit inside so that if the sensor did trigger, it would have to stay in the faulted state for a minute or so before actually giving the fault signal to the ECM. This way, if cornering hard to dodge a deer or panic stopping, the fault would only be active for a short time thus preventing nuisance tripping that requires dealer intervention. If the car ever goes in for maintenance, the mechanic would have no idea this was done and therefore warranty voiding isnt an issue. If there was a loss of coolant, this would only delay the actions taken by the ECM for only a minute and I do not see that causing any extra damage.

I have not yet built the timer version but I am pretty sure it would work. I'm curious about what would be a good delay. Long enough for nuisance fault prevention but short enough to prevent damage.
 

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Discussion Starter · #3 ·
You don't want a debate, but then list a number of "here's how I see it" assertions open to debate. As a result, don't be surprised if you get a debate.

You should have kept the thread focused on the time question.
Steve, you are correct. When I posted it I thought it would be best to say here is what I think and why. Oh well, if it stirs up a debate then it stirs up a debate. My thoughts were a way to stealthily solve the problem and the dealer tech would be none the wiser.


All that said, I am curious what others think of my version of WOTs defeat plug.
 
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