Installation of Thermostat Housing Sensors (11 Viewers)

[88Retired62]

May need to replace my original upper and lower thermostat housing electrical sensors in the near future. Feel free to correct me, but I thought I remembered, in an ancient MUD post, that applying liquid thread sealer to the sender threads prevents the proper grounding of the sending unit itself.

1. Ok, we all know…probably from a limited experience of automobile electrics, that cast aluminum
(Ie. thermostat housing) is acceptable but microscopically less acceptable as a grounding medium.
2. We’re all aware of “electrical” liquid and tape sealing thread products out there that I believe are intended to promote an electrical as well as a fluid connection/seal.

So give me some real hands-on experience and counter intuitive thoughts.
What’s the go-to installation approach?

 

[Spike Strip]

I always use a thread sealant that says, Sensor Safe, like permatex high temp, and never an issue.

I try to buy the smallest size available, cuz this stuff doesn't last long once
opened

 

[OSS]

^ yes that^
If the manufacturer of a thread sealant recommends its use for temperature senders - you"re good to go with that.

Here's another one specifically recommended for temperature senders

Permatex® Thread Sealant With PTFE, 1 OZ. - Permatex®

 

[MWM1]

Sooo... This is such a great question 88Retired62 as I am about to do the same, replace all the sensors on the upper and lower thermostat housings.
I may be mistaken, but I thought one or maybe several sensors were installed with a copper washer between the sensor and housing??? The conductivity would be the housing of the sensor, copper washer and then the thermostat housing???
Thank you!