Is there a replacement or workaround for the AC Thermac vacuum thermostat?

t44e6 · Jun 15, 2024

The vacuum thermostat for my 82's Thermac system is no longer working. Original NOS parts are going for stupid money for people restoring old cars to factory stock. Carter makes a similar part but I don't know if it would work. Currently I have the vacuum line that actuates the flapper plugged. It gets really cold where I live and it would be useful to have. I think the AC number is 305494613522. Attached is a pic I found online.

Turbo4whl · Jun 15, 2024

Maybe a different heat range, 8997493.

CLICK HERE

t44e6 · Aug 18, 2024

Turbo4whl said:
Maybe a different heat range, 8997493.

CLICK HERE

No longer available.

Ricko1966 · Aug 18, 2024

Not the answer you're looking for,but a cheap simple solution. Replace the temp sensor with,with an aquarium valve, make sure supply is hooked to manifold vacuum. Winter months open the aquarium valve,summer months close it. The flap will open and close depending on throttle position,so it won't starve for air when your in the throttle,but will provide heat to the carb at idle and cruise.

Turbo4whl · Aug 18, 2024

t44e6 said:
No longer available.

Try this link, says in stock:

https://borthautoparts.com/parts-pr.../1992-95-gm-sensor-air-cleaner-gm-no-8997493/

Turbo4whl · Aug 18, 2024

If you find it, and want it, you need to buy it immediately.

https://dragtimes.com/parts/NEW-GM-AIR-INTAKE-TEMPERATURE-SENSOR-OEM-8997493_160921876185.html

t44e6 · Aug 18, 2024

Turbo4whl said:
Try this link, says in stock:

https://borthautoparts.com/parts-pr.../1992-95-gm-sensor-air-cleaner-gm-no-8997493/

I have a request in to them.

Is there a replacement or workaround for the AC Thermac vacuum thermostat?

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