AC Blower Motor

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May 31, 2012 | 10:36 AM

greyheadeddodge

Thread Starter

4th Gear

Joined: May 2012

Posts: 4

Likes: 0

From: Mesa AZ

AC Blower Motor

I have run into a problem i can't figure out. All of a sudden the blower on the AC quit working. I can introduce 12v with my power probe at the blower motor and it will work. I have replaced the blower relay, hi speed blower relay, the blower switch and it still doesn't work. I don't think it is the tempurature control because it will activate the ac clutch when on AC but no blower. Anyone have any ideas? If it was a ground i don't think it would activate the clutch. I have checked the blower fuse and it is not blown and has power on both sides. Appreciate any ideas and help.

May 31, 2012 | 06:18 PM

sweeet76

Burning Brakes

Joined: May 2008

Posts: 948

Likes: 1

From: pensacola fl

Is the blower working at any speed setting?

May 31, 2012 | 08:31 PM

wombvette

Le Mans Master

Joined: Jan 2000

Posts: 8,918

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From: New Hill NC

Easy enough to check the ground by clipping a wire to ground and see if it works. Check the fuse first.

May 31, 2012 | 09:48 PM

markids77

Melting Slicks

Joined: Jun 2009

Posts: 2,709

Likes: 3

From: Savannah GA

If the fuse has power, check at the input to the switch. Verify power at each connection in the system until you find none... then you will know what's wrong without replacing any parts not required. If you can probe 12 volts all the way to the fan... it has to be ground related. Remember the electrons need a path to the fan, but thay also need a way back home.

Jun 2, 2012 | 10:35 AM

greyheadeddodge

Thread Starter

4th Gear

Joined: May 2012

Posts: 4

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From: Mesa AZ

Quote:

Originally Posted by sweeet76

Is the blower working at any speed setting?

Blower doesn't work at all.

Thanks

Jun 2, 2012 | 10:36 AM

greyheadeddodge

Thread Starter

4th Gear

Joined: May 2012

Posts: 4

Likes: 0

From: Mesa AZ

Quote:

Originally Posted by wombvette

Easy enough to check the ground by clipping a wire to ground and see if it works. Check the fuse first.

I have hooked a ground directly to the blower motor and thats not it.

Jun 2, 2012 | 10:37 AM

greyheadeddodge

Thread Starter

4th Gear

Joined: May 2012

Posts: 4

Likes: 0

From: Mesa AZ

Quote:

Originally Posted by markids77

I am going to try to run down both the power and the grounds again today.
I will post results.
Thanks to all.

Jun 2, 2012 | 11:42 AM

7T1vette

Team Owner

Joined: Jan 2006

Posts: 37,637

Likes: 3,118

From: Crossville TN

The Chevrolet Chassis Service Manual has detail schematics of the blower motor control system in the 'Air Conditioning' section. That will help you in your diagnosis.