Temp sender GM: AC-257M - The Supercar Registry

06-26-2016, 01:22 PM

m22mike

Senior Member

Join Date: Jan 2006

Location: West of CAK

Posts: 5,001

Thanks: 766

Thanked 841 Times in 407 Posts

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

« Previous Thread | Next Thread »

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules

Forum Jump

All times are GMT. The time now is 04:17 PM.

Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars.