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It's 1st generation distributor thermal vacuum switch. Goes in the J shaped thermostat bypass hose. Later ones went in the intake coolant crossover passage.
Thinking deeper (yeah I know, dangerous) I think these were used only on Air Injection Reactor (smog pump) cars. California emissions in other words. But still a fantastic find for somebody doing a 1000-point restoration on a a CA-delivered car.
Joe, my 66 CSM is packed up. Does the PIM reference this part to A.I.R. system?
Pat- Nov 73 parts book references 2.410, 3015780, switch, thermo vacuum.
66-67 3400, 3600. 3800 w/400 eng and AIR;
66-67 5400, 5600, 5800, 98, Toronado w/ AIR and C.A.C. (air conditioning).
The thing was $19.90 in 1973!😬
Last edited by rocketraider; Aug 3, 2021 at 02:02 PM.
