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Old 04-19-2011, 03:55 AM
biugueits biugueits is offline
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Join Date: Apr 2011
Posts: 21
Default Strange Noise

Hello friends.

I have a Ranger 4.0 V6 and I am intrigued by a strange noise ... sound ... wheezing ... a funny noise my truck makes when you put the ignition on position, without hitting start.

We all know and are accustomed to listen, when we turned the key connecting the electrical system, that noise from the fuel pump relay. What happens in mine and that is very interesting, is that besides the sound of the pump relay (later to normally) is making a squeaking ... like a weird noise like a Hard Disk when computer is running ... like triiiiiiririiii ... triiiiiriiiriii ... like a relay crossed or shorted. When I turn off the key the sound stop, returning to again when I put the key in on position.

I got more or less determine that the noise comes from the dash of RANGER, something close to the area behind the CD radio, more to the right between the vents on the dashboard and that the compartment where the passenger airbag will (mine has no airbag) .

Just to explain, the truck goes perfectly, without gaps or apparent problems. All electrical work well and never noticed any defect in the electrical system.

I would like help from friends to know if this is normal.

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Old 08-02-2011, 02:22 AM
sheltonfilms sheltonfilms is offline
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Join Date: Sep 2010
Posts: 1,633
Default Re: Strange Noise

Could be your blend door actuator. The white box on top of your HVAC box that controls the door that blends heat/cold air.

Try this open up your glove compartment by dropping the glove box and then pushing in the sides to let it down more. You should see a white box on top of your AC box to the left with an electrical connector on it. Have someone listen to it when your turn the car on.

Also try turning the key with your HVAC control to OFF, and see if it stops.

BTW the Fuel Pump Relay will just click. The actual fuel pump running will make the buzz sound.
Automotive Electronics Engineer
2000 XLT 2.5L A/T
Explorer OHC
Explorer Autodim Mirrors w/ Autolamps
Explorer Sport White Face Gauges
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Old 08-03-2011, 01:51 PM
biugueits biugueits is offline
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Join Date: Apr 2011
Posts: 21
Default Re: Strange Noise

Thanks Anthony!

I think you are rightly... is almost certain that the sound comes precisely from the white box which you refer.

I'll take the weekend and open the glove compartment to check. Soon I'll post the result.

Thank you very much!
FORD Ranger XLT 1998 V6 4.0 Bi-Fuel (gasoline & GNV) with Pehuén Camper.
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