[Vwdiesel] A/C. Again

[Shalyn Shourds]

That is, in fact, what's going on.  Appears generally fine if not 
super-cool then after I run it for a bit at RPM, the hammering starts.  
For example, I hear it exiting the highway.  I'd wondered about that, 
but couldn't think why it would be do that.  Only thing I could think of
 was a bad expansion valve, but I don't really know if they fail that 
way.  

I'll try and put the gauges to it tomorrow night.  

-Shalyn

--- On Thu, 5/2/13, lbaird119 at aol.com <lbaird119 at aol.com> wrote:


  I suppose liquid refrigerant making it back to the compressor could "slug" it and make it knock and noy cool well.  That should require it to do ok at the start and then the noise pick up as it keeps running.  Not enough oil to start with could cause it to start knocking over time I suppose.  James prebably has dealt with similar on his equipment at some time...  :-)  Gauges and checking for frost or cold lines where they shouldn't be can go a long way to diagnosing it.