Thread: a/c problem
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Old 06-13-2018, 12:54 AM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,622
 

2003 L-Series 3.0L Sedan
Default Re: a/c problem

Unless you're familiar with thermal expansion valve operation and understand refrigeration fundamentals, you may be finding an answer to match your ideas of faults that may not exist. "...5 lb low and 208 high...hours later 25 low and 165 high..." is misleading info. Do you know how to correlate temperature/pressure charts from service manuals? Unless you proof read your writings, posting misinformation may mislead anyone into incorrectly giving you info that may do more damage than good. If you mean 25 or 35 psi low and 208 high, these values are likely correct but in comparison to what ambient temperature reference and humidity? What's outlet vent temps when these values were recorded? Refrigerant pressures along with ambient temperature, humidity and vent temps are compared to t/p charts. Below is a t/p chart for '05 Vues. The values aren't exact but close enough for reference purposes. As suggested in other posts about your ac system, its always better to have service manual info from either alldata or Mitchell.

Do you have one or two cooling fans and are they running when ac is running? Is the condenser coil blocked from free air flow? A worn out or dead fan may contribute to unusual cooling problems. One member a few years ago, in Texas, wrote about an unusual problem where ac cooling was fine at speed but almost non existent in stop and go traffic. One of two cooling fans burned out and wasn't cooling the condenser coil in low speed driving. Once replaced, ac was fine. Vehicle ac requires one or two cooling fans to force airflow thru condenser coils and radiator, running when ac is turned on. Some cooling fans have three speeds (my L300) as the ecm adjusts for ac pressures.

It's not likely for your thermal expansion valve to fail otherwise the pressure differentials would be way off. Something else is going on and a complete description is lacking for anyone to have an idea of where your problem lies.
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