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74 heater blower

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Old Sep 16, 2018 | 09:16 AM
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Default 74 heater blower
My heater blower on my 74 not working at all. This is a no A/C car. Disconnected the blower and supplied 12 volts and it works, however when testing the supply to the blower it only reads 4.5 volts. Any thoughts?.
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Larry
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Old Sep 16, 2018 | 09:53 AM
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Could be the resister bank on my 77 its near the the blower ,unplug the resister and check the voltage.Than remove the resister than you can check the resisters and see if they are any good.
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Old Sep 16, 2018 | 11:19 AM
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Originally Posted by sparky77
Could be the resister bank on my 77 its near the the blower ,unplug the resister and check the voltage.Than remove the resister than you can check the resisters and see if they are any good.
Thanks, but I cannot find where the resister is at.
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Old Sep 16, 2018 | 08:38 PM
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Mine is near the blower motor in the air stream of the duct
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Old Sep 16, 2018 | 10:08 PM
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Originally Posted by red topless gator
Thanks, but I cannot find where the resister is at.

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Old Sep 17, 2018 | 08:21 AM
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Originally Posted by Peterbuilt
Perterbuilt, thanks for the reply but mine is a 74 non A/C

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Old Sep 17, 2018 | 11:09 AM
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I believe that the power supply to the heater blower has an in line fuse. On my son's 74' (his has AC) the in line fuse was under the drivers side fender as accessed from the engine compartment. I suspect the non AC cars are set up the same way. The fuse was in a fuse holder that comes apart with slight twist to reveal a typical fuse of the same type as found on the main fuse panel.
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Old Sep 17, 2018 | 11:52 AM
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https://www.zip-corvette.com/69l-79-...-resistor.html

Yours is in the same place but a different shape.
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Old Sep 17, 2018 | 02:18 PM
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Originally Posted by Peterbuilt
https://www.zip-corvette.com/69l-79-...-resistor.html

Yours is in the same place but a different shape.
Still cant physically find the resister
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Old Sep 17, 2018 | 03:50 PM
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Originally Posted by red topless gator
Still cant physically find the resister
It is bolted to the top of the blower box. Three screws. Marked in the previously post picture with a "Z".
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Old Sep 17, 2018 | 04:46 PM
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Sorry, is not there
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Old Sep 17, 2018 | 11:42 PM
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Well it looks to be mounted on the inside of the cab on a 1975 w/o A/C. So maybe yours is too...

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Old Sep 18, 2018 | 01:16 AM
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https://www.zip-corvette.com/69l-79-...-resistor.html
Wow! found at last.
Who new GM would hide it there!
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Old Sep 18, 2018 | 10:07 AM
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Originally Posted by Peterbuilt
https://www.zip-corvette.com/69l-79-...-resistor.html
Wow! found at last.
Who new GM would hide it there!
Thank you guys, thought I was going nuts there for awhile.
Larry
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Old Sep 18, 2018 | 03:17 PM
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Originally Posted by red topless gator
Thank you guys, thought I was going nuts there for awhile.
Larry
You are very welcome. Sorry for the misleadings before. Thank Willcox too! They have saved so many people due to their impeccable and thorough online schematics. Good Guy Willcox...

-Stroke
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Old Sep 18, 2018 | 03:27 PM
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Originally Posted by Strokemyaxe
You are very welcome. Sorry for the misleadings before. Thank Willcox too! They have saved so many people due to their impeccable and thorough online schematics. Good Guy Willcox...

-Stroke
absolutely!!! now got to remove the center console Grrrrrrrrrrrrrrrrrr.
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