Re: Coolant temperature sending unit readings

Posted by humanpotatohybrid On 2024/5/9 11:28:02

Let's recall that the SC and Howard's images of the sender manuals make it clear that while all 3 senders are constructed with the same TYPE of mechanism and also the same "ohm ranges", the water temperature sender and gauge are backwards, that the open circuit position on the water temp gauge reads high.

I suspect that, per DP's testing, a 20–120 ohm sender would be about right. However, it would have to read 20 ohms COLD and 120 ohms HOT which is the opposite of how pretty much every sender works, since most gauges read down the scale with an open circuit.

I really wonder whether your could disassemble and physically reverse the construction of the temp gauge to make it "normal". Unfortunately I neither have a gauge of that era myself nor even know anyone with a 48-50 car in the Pittsburgh area so I can't personally test this.