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2003 Montana AC not working


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rameam
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Jun 11, 2012, 6:39 PM

Post #1 of 6 (1405 views)
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2003 Montana AC not working Sign In

2003 Pontiac Montana, 3.4, 100K
Fans are blowing, checked relays, fuses. 93 degree ambient, high side 110, low side 25, however high side line is not hot to touch and suction is not cold (confusing). It appears to me that it ought to be blowing cold since pressures are good. The only thing left that I know of is the underdash door that switches from heat to air. Any other ideas?


Discretesignals
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Jun 11, 2012, 6:50 PM

Post #2 of 6 (1400 views)
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Those readings are probably from a low charge. You need to recover and weight the refrigerant to see how much is actually in there. Don't try topping it off.





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rameam
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Jun 12, 2012, 6:41 AM

Post #3 of 6 (1345 views)
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According to a chart I have, the pressures are good. Are you saying they aren't?


Hammer Time
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Jun 12, 2012, 6:54 AM

Post #4 of 6 (1340 views)
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Take you so called "chart" and burn it. That's the only good use for it. Those pressures are not "good". There is a whole lot more to understand about refrigeration that you are going to get from a worthless chart.




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Discretesignals
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Jun 12, 2012, 8:07 AM

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Quote
According to a chart I have, the pressures are good. Are you saying they aren't?


Yep, they aren't good. Have your refrigerant recovered and weighed. You probably have a leak in the system, so look for wet oily areas around fittings and connections. You can also have the system dyed and recharged to the correct weight. If it has a ball valve on the high side fitting, replace that before recharging. The ac shop you take it to for recovery should be able to provide you with a lot more information.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Tom Greenleaf
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Jun 12, 2012, 10:28 AM

Post #6 of 6 (1325 views)
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Toss that chart as said by HT. 110 high side is still below body temperature and @ 93F still a gas not a liquid. Said already but knowing how much comes out will be telling of how fast the leak is from when it worked properly last,

T
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