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The loudest TXV/expansion valve ever

vdubspeed on Thu June 19, 2008 1:25 PM User is offlineView users profile

Year: 79
Make: VW
Model: Rabbit C
Engine Size: 2.0 16V
Refrigerant Type: r134a
Ambient Temp: hot
Pressure Low: good
Pressure High: good

So my rabbit's ac was overhauled and blows NICE cold ac even in the hottest days here in S. GA. But sometimes when I've been running it for a while...the expansion valve will start to hum REAL loud. Imagine a giant sized tuning fork.

So I thought that perhaps a little styrofoam between the lines and ziptie them together to brace it better.

That seemed to work but yet again...drive around for a while, car gets cold and the tuning fork starts shaking. If you grab it you can actually feel it vibrating.

EVERYTHING in the A/C is new except for the evap which was flushed.

A/C performance is excellent and I won't dare mess with this if it requires me to open the system.

I'm just wondering about this oddity

Thanks,

Jason

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I

ice-n-tropics on Thu June 19, 2008 1:43 PM User is offline

V Dub,
Guess you know by now (with 3 old VWs) that the VW A/C is famous for low reliability.
Later VWs had noisy TXVs because the center operating needle/pin was not centered in the fixed orifice. At certain operating conditions the pin would chatter because it was not concentric with the opening.
Cordially,
Old IV guy

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Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
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