Hummer H2 For those who like a little more gleam to their Hummer, the H2 offers a similar rugged look as the H1, but as a lower cost, and with more added features, making it almost a massive luxury SUV.

Ac not working . Need help to identify issue

  #11  
Old 06-05-2019, 08:42 AM
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Orifice Tube

Pipes and Heat Exchanger
MixManSC has a very important point about "debris"

My compressor had indeed "grenaded" and there was a ton of debris everywhere! (see pics)

Using a flush-gun kit + fluid (search youtube) I flushed out the heat-exchanger and every remaining pipe, as the dryer, orifice tube and compressor were replaced these didn't need attention.

Some experts do not recommend flushing and advise compoenet replacement, but that can be expensive and impractical. I kept agitating and flushing in both directions until no more debris came out and then continued flushing a few more times just to make sure.
 
  #12  
Old 06-05-2019, 03:51 PM
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.. The orifices tube looks exactly like yours debris everywhere
Check pics

I will look online and perform a flush

Is it necessary to flush after the tube . I think this act like a filter
In other words . If Im replacing the dryer and compressor. What would need a flush
 
  #13  
Old 06-06-2019, 05:01 AM
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That's remarkably similar!

If you're replacing the compressor, with all the cost and effort that involves, I'd be tempted to reverse flush and forward flush the A/C Evaporator, all the pipes and its generally recommended to replace the condensor.

The theory is that small particles of debris get lodged in the micro cavities of the condensor which are difficult to flush out. Having said that, I had to flush mine as the new one leaked and it would have taken too long to get a replacement shipped to the UK.

Also there is the residual oil inside the old components which makes calculating the required amount of PAG Oil difficult, flushing helps remove it. I've attached an official GM service note and anoth Tech Tip which you may find useful.
 
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  #14  
Old 06-06-2019, 01:57 PM
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Thank you .. those link are helpful.
Will get into it in a couple weeks . Will post after
 
  #15  
Old 06-07-2019, 12:12 PM
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Hopefully you'll get your A/C running 100% and it would be good to know your progress :-)

It was July 2017 almost two years ago when I did mine, my A/C Temperature ran higher than ambient, when I started it measured 24C(75F) after it hit -3C(27F) an amazing improvement!

Cooling has dropped off a bit since as r134a molecules are small and tend to escape even perfectly sealed systems, so its no surprise, however its still effective.

Some UK Hummer owners don't bother if their A/C don't work, but they miss the point, if the HVAC system can't cool it can't regulate and the cabin temp drifts all over the place.

Again Good Luck!
 
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