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#1
06-26-2016, 05:58 AM
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Re: Temp sender GM: AC-257M
Understand, my manual gives the part number and identifies some of the stamped numbers but none like yours or even the one I have. Mine looks the same as that one except for the stamped number. If you find any definitive info I'd like to know the result, it is interesting to me. perhaps someone may have an old AC manual that has that number? take care and good luck
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Andy Team Chevelle #3135 ACES #08305 1969 Chevelle Trim Tag Research (On-going) 
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#2
06-26-2016, 01:22 PM
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Re: Temp sender GM: AC-257M
The single pin or spade brass AC units are not senders, they are a simple NO switch. The # stamped on the is probaly the trip point where the switch closes and puts the ground on the idiot light. I would guess the internal contact is a bi metallic design.
The threaded post units are varistors, and send a variable resistance to a gage. If you have VOM play with them. If you want to check the switch, heat the base in light oil. Mike
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