worm air
The ORIGINAL and bestest
Joined: Oct 2000
Posts: 10,009
Likes: 240
From: Toronto Ontario
Toronto Events Coordinator
Le Mans Master
Joined: Aug 2006
Posts: 7,417
Likes: 1,554
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Not sure if your 73 used a vacuum cut off switch but you can go to Lowe's and get a "Ball Valve" Part # T200BXB. Just splice it into your 5/8" heater hose and it will stop the flow of hot water thru the heater core. PG.
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