High Pitch Whistle

Alright, whenever I'm driving. No matter what the engine temp, or outside temp is I'll get a very highpitched whistle from under the engine bay and whenever I release the gas it will go away. Any help?

Sounds like your engine belt. Check it for glazing. Just a thought.

Uafan said:

Alright, whenever I'm driving. No matter what the engine temp, or outside temp is I'll get a very highpitched whistle from under the engine bay and whenever I release the gas it will go away. Any help?

Click to expand...

I have that same issue...I even took it in to the dealer for inspection and they couldnt find anything. Sounds like an intake leak or something, but they said they checked that and it was ok. I dont really know what the fix for this is but it is rather annoying...

It could have a cracked vacuum line or the IAC might need to be cleaned. Does it sound like a train whistle?

not like a train whistle...like a hole in a vacuum line or something...if that is in fact the case it would be pretty hard to find...

One more thought. I would check the upper plenum gaskets, they a prone to drying out and causing very small vacuum leaks that could contribute to a whistling sound.

dorman68 said:

One more thought. I would check the upper plenum gaskets, they a prone to drying out and causing very small vacuum leaks that could contribute to a whistling sound.

Click to expand...

the dealership said they checked on mine, but who really knows if they did or not...

i am having the same issue would love to know the cause is when you find out please post it, it is driving me nuts....

My high pitched whistle ended up being a torque converter...

TSB 05-17-8

09/05/05

CHIRP NOISE FROM FEAD BELT WHEN A/C COMPRESSOR IS ENGAGING

FORD:
2002-2005 Explorer

LINCOLN:
2003-2005 Aviator

MERCURY:
2002-2005 Mountaineer

ISSUE
Some 2002-2005 Explorer/Mountaineer and 2003-2005 Aviator vehicles may exhibit a chirp noise from the front end accessory drive (FEAD) belt when the A/C compressor is engaging.

ACTION
Verify concern. Replace the A/C compressor clutch pulley, and set the clutch air gap to the specification listed in this TSB (the Workshop Manual specification is being updated). Refer to the following Service Procedure.

SERVICE PROCEDURE

1. Recover the refrigerant.

2. Remove the A/C compressor. Refer to Workshop Manual Section 412.

3. Using the special tool 412-098, hold the A/C clutch plate and remove the clutch nut.

4. Remove the A/C clutch disc and hub.

5. Remove the A/C clutch hub spacer.

6. Remove the A/C compressor pulley snap ring.

CAUTION DO NOT USE AIR TOOLS. DAMAGE TO THE A/C CLUTCH PULLEY OR A/C COMPRESSOR MAY RESULT.

7. Using the special tool 412-001, remove the A/C clutch pulley.

8. Install the new A/C clutch pulley using special tool 412-109.

9. Reinstall the A/C compressor pulley snap ring.

10. Reinstall the original A/C clutch hub spacer.

11. Reinstall the A/C clutch disc and hub.

12. Using special tool 412-098, hold the A/C clutch plate and reinstall the A/C clutch nut. Tighten to 14 lb-ft (19 N.m).

13. Measure and adjust the clutch air gap to 0.010 - 0.024" (0.254 - 0.610 mm), by adding or removing A/C clutch disc and hub spacers.

14. Reinstall the A/C compressor.

15. Recharge the system.


WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage

OPERATION DESCRIPTION TIME

051708A 2002-2005 1.1 Hrs.
Explorer/Mountaineer 4.0L
SOHC: Replace The A/C
Compressor Clutch Pulley
(Do Not Use With 19700A,
19700A4, 19700AZU,
19700R)

051708B 2002-2005 1.2 Hrs.
Explorer/Mountaineer 4.6L
SOHC: Replace The A/C
Compressor Clutch Pulley
(Do Not Use With 19700A,
19700A4, 19700AZU,
19700R)

051708C 2003-2005 Aviator: 1.4 Hrs.
Replace The A/C
Compressor Clutch Pulley
(Do Not Use With 19700A,
19700A4, 19700AZU,
19700R)