Defogger not working

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Nov 19, 2024 | 01:31 AM

79Goodday_vette

Thread Starter

7th Gear

Joined: Nov 2024

Posts: 7

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From: Oak Harbor, Wa

Defogger not working

I'm a new buyer of a 79 corvette and with any older car, is has issues but I'm somewhat knowledgeable of older cars. The heater works and I can feel it but nothing comes out of the vents or the defogger vent. Is it just blocked off somewhere or is it the control panel

Nov 19, 2024 | 02:02 AM

RickM Z06

Burning Brakes

Joined: Apr 2014

Posts: 872

Likes: 700

From: Oregon

Pull the glove box out and see if you are getting a vacuum signal to the defrost actuator?

Nov 19, 2024 | 08:19 AM

interpon

Le Mans Master

Joined: Jun 2019

Posts: 7,645

Likes: 2,464

From: Indiana

Welcome! Post some pics of your ride!

there isn’t a nut or bolt not known on this forum, let alone helpful, kind people.

suggest..
wiring diagram for 79 here.
https://www.corvetteforum.com/forums...-in-color.html

also suggest reading this for only floor vents..
https://www.corvetteforum.com/forums...-switch-2.html

also see vacuum schematic

Nov 19, 2024 | 04:21 PM

4-vettes

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Joined: Nov 2006

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From: Sunshine Coast, Queensland, Australia

2025 C3 of the Year Finalist - Modified

2024 C3 of the Year Finalist- Modified

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Cruise-In VIII Veteran

Most common issue. Vacuum switch breaks plastic rivet.
A list of every possible cause? Don't have that much time.
How about you pull apart your console and dash and do some trouble shooting.

Dec 12, 2024 | 03:01 AM

79Goodday_vette

Thread Starter

7th Gear

Joined: Nov 2024

Posts: 7

Likes: 0

From: Oak Harbor, Wa

I got the heat to work!! Thanks for the advise and diagram, much appreciated!!

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