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04 Mountaineer - Compressor noise/vibration - normal?

cross6 on Sun June 28, 2009 1:10 AM User is offline

Year: 2004
Make: Mercury
Model: Mountaineer
Engine Size: 4.0 V6
Refrigerant Type: r134a
Ambient Temp: 95
Pressure Low: 60
Pressure High: 225
Country of Origin: United States

WITH rear air.


I noticed what sounded like a really fain knocking noise in the cabin, it went away when I turned the AC off. I popped the hood and noted the following:

With AC ON:

High pressure line /w port coming from compressor vibrates a lot (visibly shaking)
With your hand on the line - you feel a strong pulsing
Mechanic's stethoscope reveals a loud thumping when placed on high pressure line/compressor.



That being said, the system cools well - 38 degrees vent temp on highway when it's 100 degrees.


I've never paid attention to see if it always did that?


The Ford manual states:


Quote
NOTE: Vehicles equipped with Visteon fixed scroll A/C compressors may experience rapid refrigerant high side pressure fluctuations upon cold startups and/or after refrigerant system recharges. These high side refrigerant fluctuations are characteristic of the Visteon fixed scroll compressor and not an indication of a failing/failed A/C compressor.


Are those fluctuations what I'm seeing hearing? Normal for a Visteon scroll unit? Or is it about to lock up on me?

Chick on Sun June 28, 2009 7:41 AM User is offlineView users profile

That happens with scrolls, haven't worked on the Ford scrolls yet, but it is the way most scrolls work. I have felt it to a lesser degree on Chrysler and Honda scrolls, and it does not affect cooling.. perhaps someone here with more experience with the Ford trucks can tell you more..But it would appear your truck is doing what it should...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

cross6 on Sun June 28, 2009 4:15 PM User is offline

Well I did some sleuthing, and underneath the compressor, the bracket that holds the high pressure line to the engine is broken, that's why the line is shaking so bad!


Phew!

Chick on Sun June 28, 2009 9:54 PM User is offlineView users profile

That would cause some "unusual" shaking I imagine, glad you looked...We can't tell how bad a vibration or other things are from here, you did the right thing to look...

-------------------------
Chick
Email: Chick

---------------------------------------------

Freedoms just another word for nothing left to lose

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