"Squeaks" in dash as soon as ignition is on. - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 02-13-2014, 03:46 PM Thread Starter
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"Squeaks" in dash as soon as ignition is on.

I have a 09 F350 that is squeaking. When I turn on the ignition the squeak starts. This squeak starts even before cranking. I have all of the climate control fans secured. It sounds like it is inside the cab behind the radio area. Any ideas?

When I turn on the ignition a vacuum pump(?) under the hood starts. It stays on after the engine is running as well. Is that normal?

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Dale

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2009 F350 Lariat
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post #2 of 8 Old 02-13-2014, 04:52 PM
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Vacuum pump... you might have a leak if it is constantly running, supposed to adjust to pressure and shut off. Put a gauge on it or listen for vacuum with the motor off and you might be able to hear the broken line. I use a smoke tester to speed the process up.

Dash noise... haven't looked into it, I just heard this on mine this morning too but haven't driven the truck in 2+ months so going to keep watching, let me know what you find.

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post #3 of 8 Old 02-13-2014, 05:41 PM Thread Starter
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Can you describe the smoke tester?

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post #4 of 8 Old 02-14-2014, 10:00 AM Thread Starter
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Research has suggested the best way to test the pump is to disconnect it from the vacuum line and place my finger over the pump inlet. If the pump shuts off, I have a leak in a vacuum line. If it does not shut off, my pump is bad.

As for the squeak in the dash, it was not there this morning... I will have to do more research. I have a feeling it is related to the vacuum pump as some of the climate control stuff is tied into the vacuum system. Next time I get the squeak, I am going to disconnect from the vacuum pump to see if that has an effect.

Dale

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post #5 of 8 Old 02-15-2014, 08:25 AM Thread Starter
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Vacuum pump is fine. It shuts off when you plug the inlet. So I am chasing a vacuum leak.

As for the squeak, I am not sure of its cause. I was able to rule out my perceived tie to the vacuum pump. While it was squeaking I disconnected the vacuum line and the squeak persisted. Squeak stops as soon as power is off though. Also the squeak was not present when the truck was first powered after sitting all night. The squeak started after warming and would continue even with engine off but ignition on.

Off in search of the vacuum leak first....Any suggestions?
Dale

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post #6 of 8 Old 02-15-2014, 10:32 AM Thread Starter
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To track the vacuum leak, I started at the pump. I worked my way through the system by disconnecting each point and plugging it till the pump went off. I found the broken fitting at the passenger wheel hub. Vacuum leak is fixed. Pump shuts off.

Now to figure out that squeak that sounds like a styrofoam container rubbing against itself....

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post #7 of 8 Old 02-15-2014, 04:22 PM
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Does the squeak sound like two Styrofoam pieces rubbing against each other? If so, it is likely a blend door actuator going out. My lower one is going out and sounds like squeaking Styrofoam

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post #8 of 8 Old 02-15-2014, 07:03 PM Thread Starter
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I will look into it. Thank you.



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