Unidentified part
Old(s) Fart
Joined: Mar 2007
Posts: 50,803
From: Northern VA
It's an add-on temp sensor port that goes in the upper radiator hose. The thermal vacuum switch is designed to switch the distributor vacuum advance source from ported to manifold vacuum if the engine starts to overheat.
Oldsdruid
Joined: Dec 2007
Posts: 10,629
From: Southside Vajenya
Fremont car, odds are good it was delivered in California. I'm gonna say it was tied to CA emissions equipment, maybe a factory retrofit, and you'd probably find it in 1965-66 Service Guilds or Tech Bulletins.
I've never seen one mounted in the radiator hose but look in deaddds parts ID thread for one that went in the 66-67 thermostat bypass hose.
It's the kind of thing that would send an inexperienced judge into low orbit and highlights the need for comprehensive OCA judges' training.
Ain't the only time Oldsmobile tied a factory fix or retrofit into a coolant hose, either.
I've never seen one mounted in the radiator hose but look in deaddds parts ID thread for one that went in the 66-67 thermostat bypass hose.
It's the kind of thing that would send an inexperienced judge into low orbit and highlights the need for comprehensive OCA judges' training.
Ain't the only time Oldsmobile tied a factory fix or retrofit into a coolant hose, either.
Registered User
Joined: Mar 2010
Posts: 3,868
From: Mt.Ary, MD
Fremont car, odds are good it was delivered in California. I'm gonna say it was tied to CA emissions equipment, maybe a factory retrofit, and you'd probably find it in 1965-66 Service Guilds or Tech Bulletins.
I've never seen one mounted in the radiator hose but look in deaddds parts ID thread for one that went in the 66-67 thermostat bypass hose.
It's the kind of thing that would send an inexperienced judge into low orbit and highlights the need for comprehensive OCA judges' training.
Ain't the only time Oldsmobile tied a factory fix or retrofit into a coolant hose, either.
I've never seen one mounted in the radiator hose but look in deaddds parts ID thread for one that went in the 66-67 thermostat bypass hose.
It's the kind of thing that would send an inexperienced judge into low orbit and highlights the need for comprehensive OCA judges' training.
Ain't the only time Oldsmobile tied a factory fix or retrofit into a coolant hose, either.
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