Due to poor original temperature gauge design I was thinking for quite a while of a way how to create some sort of warning if engine is overheating. I think I have a plan in my head now
My goal is:
- Keep it simple.
- There should be no additional mods necessary to cars interior (no additional gauges, no additional lights etc.)
- Warning system should be easily installable.
- Should warn about overheating in good time.
I think I could use existing low coolant warning system for overheating warning.
What if I could incorporate small NC thermo-switch into the existing probe. Existing probe is just a stainless steel pin which shorts to ground through coolant. If coolant level is too low, then no ground and you get a red warning light on your dash with radiator.
My idea is to fabricate stainless steel capsule that could fit into existing probe hole. something like this:
and then insert and JB weld NC thermo-switch with temperature rating of ~105c into the capsule.
Wire in such a way that wire from the low coolant module goes to one contact of thermo-switch and another contact of thermo-switch conected to stainless steel capsule body. In this case ground contact will be lost if coolant level drops or C thermo-switch goes open. In both cases warning light on your dash will light on to get your attention.
My concerns are:
- Not sure if I can find small enough NC thermo-switch. should be smaller then original probe.
- Of couce larger hole can be drilled to accommodate bigger probe but then I need a suitable rubber grommet.
- Is JB weld a good heat conductor?
- what temperature rating switch should I use? is 105c too high or too low?
- any other concerns I should take into account?