Looking at the 1972 Pontiac Shop Manual Wiring Diagram I see that the heater control lamp should be fed by a grey wire. This grey wire is linked to the radio indicator lamp.
If your radio light is OK I think you need to look at the ground for your heater lamp.
Also I wish I could go to my salvage yard and find a 1972 to pull parts off of.
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Bill Nawrot (Wino Bill)
1972 GTO Hdtp One Owner, GTOAA "Concours Best Original" 2007, 2013, and 2019
Auto-Biography http://oneownercollectorcar.com/inde...to-bill-nawrot
HPP Sept. 2014 https://www.hotrod.com/articles/1972...-gee-no-g-t-o/
YouTube MCACN 2014 http://youtu.be/1IPQVPevbxU
1967 GTO Conv
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