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Ok, you are changing parts with no logic.
Did you replace the rad with the upgraded one that nurse recommended. What brand of stat and sensor?
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I have seen (only in passing) mods for cooling hoses for the MX5 to improve water circulation. Lots of results for "MX5 cooling reroute" - including full kits. If you have already seen that then apologies.
Edit: Ignore that. Only just saw that it seems more electrical.
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Let me chat to some MX5 nerd friends and see what they say.
Just to check, you're using the MX5 dash, so it's the stock MX5 gauge, stock MX5 sender?
lynx
Aroogah
NurseHolliday
@mi7rennie
Update / still looking for suggestions on 1.8 MX5 Westfield overheating issue.
Replaced rad, thermostat and both temp sensors.
Reading the housing, stat opens at 88 degrees, fan kicks in at 97 and off again around 90.
Temp gauge reads zero when unplugged, but rises off the scale when the housing that the sensor is into is around 80 degrees as measured with IR thermometer.
So basically I don't think it's overheating, if it was the fan would be on permanently.
Could it be the gauge in the dash or a bad earth?