73 blower
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Joined: Dec 2017
Posts: 90
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From: Monroe NC
73 blower
Working on my 73 blower motor and tracked it down to a bad ground. Now it runs all the time on low speed. the speed changes when you move the switch but does not turn off completely. Is this normal for a 73?
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From: MA
Pro
Joined: Nov 2016
Posts: 729
Likes: 118
From: Kelowna British Columbia
My 73 was doing this and it is not normal. Down under the console plate beside the heater controls there are 2 micro switches. The master and a/c. I found the master microswitch would not release so replaced for $12 and off went the blower
Mine has a/c so probably different
Mine has a/c so probably different
Last edited by henrikse; Jan 26, 2018 at 11:02 AM.
Burning Brakes
Joined: Sep 2005
Posts: 1,049
Likes: 205
From: Lewes Delaware
The constantly running fan is part of GM's Astro Ventilation System.
Some info about the system in this thread:
https://www.corvetteforum.com/forums...ntilation.html
Fran
Melting Slicks
Joined: Mar 2006
Posts: 3,456
Likes: 102
From: Piedmont Va
St. Jude Donor '11-'12-'13,'19-'20
My 73 is non-AC and astro-vented and the fan shuts off when the switch is off. Now maybe its not functioning right as it only works on high speed when it's on. 
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Burning Brakes
Joined: Sep 2005
Posts: 1,049
Likes: 205
From: Lewes Delaware
Refer to the picture of the console from my stock 73 with A/C. From page 31 of the owner's manual:
"Selector Control- The left thumb wheel (bottom one in my picture) operates the compressor, controls air source and operates the blower at low speed (except OFF) in all modes. When the control is in the OFF position, the system is totally inoperative."
Similar wording is also shown on page 30 describing the operation of the heater and defroster system in a non A/C car.
An owner's manual is a great book to add to your corvette library.
Fran
