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Heater Fan Operation

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Old Nov 20, 2012 | 11:53 AM
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Default Heater Fan Operation

71 Vette, Is the heater fan supposed to blow on all speeds when the mode selector wheel is in the off position? Mine does, I don't think it used to.
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Old Nov 20, 2012 | 05:20 PM
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Hi myk,
My understanding is that:
Non-a/c cars have a 3 speed blower and the blower is always on low regardless of the mode selection.
On a/c cars the blower has 4 speeds and the blower is only off when the left side mode selector is in the off position.
Regards,
Alan
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Old Nov 20, 2012 | 05:40 PM
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Thanks Alan.. guess mine is messed up then.. I thought I remembered it turning the fan off when I turned the mode wheel to off
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Old Nov 20, 2012 | 06:36 PM
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Originally Posted by Alan 71
Hi myk,
My understanding is that:
Non-a/c cars have a 3 speed blower and the blower is always on low regardless of the mode selection.
On a/c cars the blower has 4 speeds and the blower is only off when the left side mode selector is in the off position.
Regards,
Alan
While Alan's description indeed matches the 71 owner's manual description neither of my non-a/c 71's operate this way. Both have the 4 position fan described on pg 29 of the owner's manual under Four Season Air Conditioner Operation where there's a 4 position switch off, lo, med, high. If the fan switch is set to off the fan does not operate and neither thumb wheel over rides the setting if the fan is set to any on position (as it is designed to do with A/C cars).

I'd be interested in hearing if other non-a/c cars differ from this.

Last edited by Hammerhead Fred; Nov 20, 2012 at 06:43 PM.
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Old Nov 21, 2012 | 07:44 AM
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Hi HF,
The switch on my 71 non a/c car has FOUR positions... off, low, medium, high... I never noticed the discrepancy with the owner's manual.
Is it possible that the a/c cars have a switch with FOUR speeds... low, low/medium, high/medium, and high????
Regards,
Alan
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Old Nov 21, 2012 | 01:30 PM
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Originally Posted by Alan 71
Hi HF,
The switch on my 71 non a/c car has FOUR positions... off, low, medium, high... I never noticed the discrepancy with the owner's manual.
Is it possible that the a/c cars have a switch with FOUR speeds... low, low/medium, high/medium, and high????
Regards,
Alan
And four positions matches the non-A/C fan control description on pg 28 of the 1972 owner's manual. MY 72 w/A/C operates as described by the manual where the thumb wheel on the left over rides the fan blower when pushed up to the off position.

What's the possibility the 71 manual just wasn't updated from the 1970 operation?
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Old Nov 21, 2012 | 01:56 PM
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Originally Posted by Alan 71
Hi HF,
The switch on my 71 non a/c car has FOUR positions... off, low, medium, high... I never noticed the discrepancy with the owner's manual.
Is it possible that the a/c cars have a switch with FOUR speeds... low, low/medium, high/medium, and high????
Regards,
Alan
Yes your right Alan A/C cars have 4 speeds I think they cal it Low, Medium 1, medium 2 and high...
Peace
Frank
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Old Jan 15, 2013 | 09:35 PM
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Default Heat/ac fan on my 74 coupe Wil not run on high speed.

Recently installed new heat and ac controls, fan motor, resistor and fan switch. The fan will not run on the high speed setting. Is there something I am overlooking? 2vetteowner
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Old Jan 15, 2013 | 09:47 PM
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Default Check the fuse first!

Originally Posted by 2vetteowner
Recently installed new heat and ac controls, fan motor, resistor and fan switch. The fan will not run on the high speed setting. Is there something I am overlooking? 2vetteowner
There is a separate in line fuse for the "High" position, it's under the left fender near the M/C.
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Old Jan 19, 2013 | 03:05 PM
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Originally Posted by petes74ttop
There is a separate in line fuse for the "High" position, it's under the left fender near the M/C.
Thanks. i'll check it when I get the car back from a restoration shop....in for new paint.
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