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Blower fan HVAC relay?

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Old Jul 1, 2018 | 02:02 AM
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George Karpin's Avatar
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Default Blower fan HVAC relay?

Hi all,
My blower motor sometimes works and sometimes doesn't. The motor isn't making any noise and works fine on all settings when it turns on. However after it sits overnight or longer than few hours the blower motor might not kick on. Ac works and the clutch engages for the a.c.

Is there a relay issue Where it can sometimes work? If it was the resistor wouldn't it not work at all?

Let me know it's too hot out.
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Old Jul 1, 2018 | 04:53 AM
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2 fuse in the foot well,

https://www.corvetteforum.com/forums...otor-fuse.html




So far right, second one up on the BCM itself, and the over to the left one row and one up from that one is the second fuse.

Short of this, may be time to pull the HCAC controller to check for a cold solder joint, or may even have to pull the fan motor to see if it's binding up, and popping it thermal fuse/it relay is dying instead.

The relay for the fan, is in the fan unit.

Last edited by Dano523; Jul 1, 2018 at 05:10 AM.
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Old Jul 1, 2018 | 12:13 PM
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I pulled the fuses they are fine. It so odd that it'll work sometimes and then other times just noy even kick on. How hard is it to pull out the relay? Is it a whole dash tear down? Please say no... Can you get to the relay but just removing it under the dash and leaving the fan motor there?
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Old Jul 1, 2018 | 01:38 PM
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Default Update 2

Update.... I tapped the blower motor and it kicked on? Is that a relay? Or motor issue? Also... How terrible is that too replace.... Worse than when I replaced my master cylinder and booster?
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Old Jul 2, 2018 | 07:04 PM
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Originally Posted by George Karpin
Update.... I tapped the blower motor and it kicked on? Is that a relay? Or motor issue? Also... How terrible is that too replace.... Worse than when I replaced my master cylinder and booster?
Start with disconnecting the fan connector, cleaning it, and see if the problem is there. If not, then the fun had by all is about to begin to get the fan out to begin with.


Also, are you sure that it was the shock to the fan bottom, and not the HVAC controller that solved the problem to get the fan spinning again?

Last edited by Dano523; Jul 2, 2018 at 07:11 PM.
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Old Jul 2, 2018 | 07:14 PM
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Not sure if it's the fan bottom or controller... The motor sounds fine works fine when it does. Id say 70% of the time when i cold start.

Whats the way to determine that it might be controller?
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