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My '64 AC Coupe has a functional 3 speed fan, it shuts off when the AC is turned on. I normally can't hear the fan running as the N11 exhaust and the L76 engine mute it out.
The Video shows the high 3rd speed setting on the pull ****. The 36 gallon fuel tanker would block the inlet for the fan so there's no way for the fan in those cars!
I like that feature in my 65. I’m sure it was discontinued because it didn’t move enough air to justify the cost, but, IMO, if it moves any air at all it’s gotta help!
Purposeless in 1963, the coupe's so called air outlets behind the doors were restyled and made functional in 1964, at least on the driver's side, where an electric ventilation motor, located in cramped quarters behind the left rear wheel-well, tried somewhat vainly to push out the 1964's bad air. A nice idea, but it was severely limited by the small, three speed motor's weak lungs. The equipment was deleted after 1965.
Pic is taken from Classic Corvette The First Thirty Years by Mike Mueller (p186)
Purposeless in 1963, the coupe's so called air outlets behind the doors were restyled and made functional in 1964, at least on the driver's side, where an electric ventilation motor, located in cramped quarters behind the left rear wheel-well, tried somewhat vainly to push out the 1964's bad air. A nice idea, but it was severely limited by the small, three speed motor's weak lungs. The equipment was deleted after 1965.
Pic is taken from Classic Corvette The First Thirty Years by Mike Mueller (p186)
Wonder if you could replace the motor with a stronger one.
The term astroventilation did not become known until Chevy did away with the vent windows.
Didn't know what to call it . Made the video about a year ago didn't think I had any thing on at the time. Had the wife come out to make sure I wasn't imagining air coming out of the vents I thought were fake
Wonder if you could replace the motor with a stronger one.
There's no need to. The rear blower uses the same size motor and fan that's in the heater. In a correctly operating system, it moves as much or more air than the heater. The video posted above by mjdart shows how they are supposed to work.
Didn't know what to call it . Made the video about a year ago didn't think I had any thing on at the time. Had the wife come out to make sure I wasn't imagining air coming out of the vents I thought were fake
That was a cool way to show the vent working (no pun intended).
Purposeless in 1963, the coupe's so called air outlets behind the doors were restyled and made functional in 1964, at least on the driver's side, where an electric ventilation motor, located in cramped quarters behind the left rear wheel-well, tried somewhat vainly to push out the 1964's bad air. A nice idea, but it was severely limited by the small, three speed motor's weak lungs. The equipment was deleted after 1965.
Pic is taken from Classic Corvette The First Thirty Years by Mike Mueller (p186)
Thanks for posting this. That system is a lot bigger than I imagined. I can see why the pencil pushers were happy to have it gone with the wind.
The one thing no one has mentioned is why it moved so little air at all speeds.
Number of years back there was a write-up in one of the Corvette magazines I subscribed too, where a gentleman was trying to find out why, although the fan had three speeds, it only ran on low speed in all positions.
He started looking at wiring diagram and found GM had made an error in wiring diagram that if I remember correctly did not allow the fan to run at higher speed when medium and high positions were selected. He figured out the correct wiring needed to make fan run at the 2 higher speeds by, if I remember correctly grounds for those two speeds were not connected, so that when selected fan motor would speed up and pull more air out of interior compartment. The wiring problem was on board located back, that fans wires connected too.
Think this was around 2008-2010 time frame. I know at time the 64 I purchased did not have the rear fan in it, so I picked one up down in Orlando at Old Town show because of artical. 1st time I ever saw Frank's C1. Also still have it, as I went Restomod with car. May even have two, as I think the 2nd 64 coupe I bought has one in pile of parts that came with it when I was unloading them around 4-5 years when I bought it.
Number of years back there was a write-up in one of the Corvette magazines I subscribed too, where a gentleman was trying to find out why, although the fan had three speeds, it only ran on low speed in all positions.
He started looking at wiring diagram and found GM had made an error in wiring diagram that if I remember correctly did not allow the fan to run at higher speed when medium and high positions were selected. He figured out the correct wiring needed to make fan run at the 2 higher speeds by, if I remember correctly grounds for those two speeds were not connected, so that when selected fan motor would speed up and pull more air out of interior compartment. The wiring problem was on board located back, that fans wires connected too..
That article was from Kevin MacKay (owner of Corvette Repair in New York), and was published about 20+ years ago; the wiring from the factory was correct, but there was an error in the factory wiring diagram which would result in a one-speed fan if you used the factory diagram as a reference to make a harness or diagnose a problem.
There's no need to. The rear blower uses the same size motor and fan that's in the heater. In a correctly operating system, it moves as much or more air than the heater. The video posted above by mjdart shows how they are supposed to work.
Maybe so, but obviously it’s not enough, so why can’t a stronger motor of the same dimensions be installed? Are there supposed to be open vents where cabin air is drawn into the motor?
Last edited by 59BlueSilver; 04-11-2019 at 10:51 PM.
Are there supposed to be open vents where cabin air is drawn into the motor?
Cabin air is drawn into the fan housing through the bent piece of chicken wire screen at the back end of the driver's side rear quarter inner panel carpet, and exhausted through the output duct to the roof vents. See attached DZ file.
So what prevents water going into the outside ventilation outlet during a rain storm and car wash causing a flood?
The angle of the vents when the car is moving down the road. If it pulls it in in any circumstance it's got a dipped area inside that has a drain hole that drains just in front of the left rear tire so it doesn't run down into the cabin.
09-18-2018, 05:13 PM
