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1990 R1500 blower motor not running after heater core replacement

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Old November 20th, 2021, 12:27 PM
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Default 1990 R1500 blower motor not running after heater core replacement

I just replaced the heater core in my friend's 1990 Suburban R1500, and now the blower doesn't run. I didn't knowingly disconnect any electrical connectors. Can anyone direct me to resources for a fuse diagram and wiring diagrams?
Also, does anyone know of any hot spots where I might have been likely to disconnect or pinch a wire during this job? If it makes a difference, it was the one where you have to remove the heater box with the 3 studs through the firewall, not the one where you pop the bottom off the heater box.
Thanks!
Old November 21st, 2021, 9:21 AM
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I'd check the fuses first. Is the fuse diagram on the underside of the fuse cover?
Old November 26th, 2021, 10:46 AM
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For anyone researching the same problem, it was super simple. I accidentally disconnected the power wire to the blower while disconnecting the heater hoses.

Similar thread here:
https://www.gmtruckclub.com/threads/...r-wire.837386/

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Rednucleus (November 26th, 2021)
Old November 27th, 2021, 12:04 AM
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Originally Posted by relative4
For anyone researching the same problem, it was super simple. I accidentally disconnected the power wire to the blower while disconnecting the heater hoses.

Similar thread here:
https://www.gmtruckclub.com/threads/...r-wire.837386/

​​​​​​
Way to go man!
Old November 27th, 2021, 9:02 AM
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Thanks for posting the fix; many people fail to do the update.

And we've ALL done some stupid stuff in the past....
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