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Old 11-11-2016, 10:25 PM   #1
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No Dash Air Flow

I just changed the dash blower. The blower now works fine. I can hear the speed change as I turn the switch, but there is little air flow through any ducts. Changing the routing dial position has no discernible impact. I'm pretty sure all the hoses are in place. What controls the dampers that direct airflow to the dash vents, floor vents and defroster vents?

Cheers,
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Old 11-11-2016, 10:50 PM   #2
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There us a vacuum pump under the hood area. The manufacturer described it as looking like a pistol. Doesn't exactly look like that but it helped me isolate it. I tapped it with a hammer and it began working agsin. They default to blowing defrost with no vacuum available. Mine has worked for almost 2 years now after just tapping on it. They cost about $150 new I believe
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Old 11-12-2016, 04:45 AM   #3
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Can someone please post a picture of what I need to tap. Thanks
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Old 11-12-2016, 08:19 AM   #4
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This is it $50 , 1999 Ford diesel



Ford Vacuum Pump | F150 F250 Super Duty F350 F350 Super Duty - 2011 1999 2012 2005
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Old 11-12-2016, 08:36 AM   #5
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My vacuum pump is mounted on the fire wall about in the center above the generator. You should be able to find it by tracing the plastic vacuum lines. On mine it is covered with a black box that you have to remove.

Back in 2011 I installed a Onan wireless generator start that required the control box be mounted close to the generator. I mounted on the firewall but during the process I accidentally moved one of the vacuum lines and it developed a leak causing the vacuum pump to run continuously. There was a clicking sound that I couldn't immediately diagnose. Finally found the vacuum pump under the black box.
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Old 11-12-2016, 08:39 AM   #6
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Pretty sure your 03 Monaco uses an elect vacuum pump at least
that's what my 03 Windsor uses .
Some Monaco's us an air type vacuum that is usually replaced with
an elect pump when they malfunction
It might look like this black box


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Old 11-12-2016, 08:44 AM   #7
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Mine, on an older HR Endeavor looked more like a tennis ball with small hoses. It was over the genset on the firewall when you looked up. If I remeber correctly, it was fused (can't remember where the fuse was located).
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Old 11-12-2016, 10:13 AM   #8
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Mine looks like Ramidave posted. A Ford pump
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Old 11-12-2016, 10:18 AM   #9
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This may be coming from left field , but is there a possibility that the new blower motor isn't the correct rotation to get the fan to blow through the dash system.
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Old 11-12-2016, 01:01 PM   #10
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Quote:
Originally Posted by Skip426 View Post
This may be coming from left field , but is there a possibility that the new blower motor isn't the correct rotation to get the fan to blow through the dash system.
Skip, you gave me a real heart stopper: rotation direction never occurred to me. Without exageration, it took 4 hours and cutting the dash structure to get the blower out and three hours to get it back in. Maybe the poorest design I have seen in decades.

I have lucked out, though. The Murray brand replacement from O'Reilly's is the same rotation.

bruceisla, you nailed it. I never knew what that thing did, but as soon as I looked at I realized that I had knocked off one of the small air lines when I changed the resistor pack. Once again, I should always look at the last place I worked.

Thanks folks, all is working again.

Cheers,

Bob
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Old 11-12-2016, 03:45 PM   #11
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Quote:
Originally Posted by bobcovey View Post
Skip, you gave me a real heart stopper: rotation direction never occurred to me. Without exageration, it took 4 hours and cutting the dash structure to get the blower out and three hours to get it back in. Maybe the poorest design I have seen in decades.

I have lucked out, though. The Murray brand replacement from O'Reilly's is the same rotation.

bruceisla, you nailed it. I never knew what that thing did, but as soon as I looked at I realized that I had knocked off one of the small air lines when I changed the resistor pack. Once again, I should always look at the last place I worked.

Thanks folks, all is working again.

Cheers,

Bob
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Old 11-12-2016, 03:55 PM   #12
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Quote:
Originally Posted by bruceisla View Post
Mine, on an older HR Endeavor looked more like a tennis ball with small hoses. It was over the genset on the firewall when you looked up. If I remeber correctly, it was fused (can't remember where the fuse was located).
bruceisla & bobcovey

That would be your "vacuum reservoir"....(NOT the "vacuum pump").

TYPICAL VACUUM RESERVOIR
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Old 11-13-2016, 05:29 AM   #13
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bruceisla & bobcovey

That would be your "vacuum reservoir"....(NOT the "vacuum pump").

TYPICAL VACUUM RESERVOIR
That's true ... the pump is right next to it ... but easier to identify by reservoir shape.
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Old 11-13-2016, 05:57 AM   #14
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Right on! I disturbed the wires on my vacuem pump and it came back on, I guess there was some corrosion on the connection works fine now.
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