Quote:
Originally Posted by Iluvspeed
Thanks for both of the quick replies! I was aware that the standard ERA configuration measured water temp at the lower radiator hose. Until now, I "assumed" (you know what they say about assuming...) that the lower hose was the hot location.
However, with your comments and the fact that the ERA thermo-switch triggers at only 75 C (about 170 F) tells me it senses the cooler temps--at the bottom of the radiator.
Again, bad assumption on my part regarding the flow direction. Thanks for setting me straight. (As I trace the wiring on my car, it's becoming to me that the prior owner (and constructor) did not use the standard ERA wiring harness. I'm thinking my next "retrofit" will be installing the proper ERA harness along with the lower thermo-switch.)
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You can use the probe-type sensor that goes in the radiator fins. Typically they're installed 1.5-2"
Derale controllers are common / popular, and this model (
https://derale.com/products/electric...8758585-detail ) says to install it as follows:
THERMOSTAT PROBE INSTALLATION- The temperature probe must be inserted into the radiator core between the fins. The best location is close to the water inlet near the radiator tank.
- The probe should fit tightly in the radiator fins and should not extend past radiator core more than 1/4”.
There's more, but your controller should come with instructions. Alternatively, you can go to the link above or another and download instructions.