<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Posted by Tower...Gosh, Jonahs. I hate for you to get corrected twice in one thread. </div></BLOCKQUOTE>Whoa Tower. Let's not get hasty with the corrected word. I answered a question by H2Sin on discharge temperature. He didn't ask for the principles of air conditioning or how does humidity affect my system. Commercial buildings are designed for peak loads and extreme latent heat and then the DX (direct expansion) controlled by unloaders, bypass or other controls. Well designed vehicle systems are likewise designed for peak loads because of their extreme varying conditions, radiant heat, etc. and inexpensively controlled by cycling the compressor. They can do that because it's externally driven by the engine. Out of curiousity I connected my thermistor to the center duct for a day. During balanced operation it maintained a solid 20 degree split across the coil and at heavy load after sitting in the sun all day got as high as a 31 degree split for a short while. I then drove it through the car wash and had it call for maximum cooling. I'm sure you can guess the humidity and the split didn't change over 1 degree. The discharge temp actually went down but that's because of the lower ambient inside the car wash. Humidity DOES affect a/c but that wasn't the question and if the vehicle system is designed well you shouldn't notice a large change in discharge temperature. But then again, what do I know. I'm sure Google takes precedence over the 52,000 a/c service calls we've run the last 4 years.

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<H4><FONT color=#254164>A/C Performance Table</FONT></H4></A>
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Ambient Air Temperature</P></TH>
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Relative Humidity</P></TH>
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Service Port Pressure</P></TH>
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Maximum Left Center Discharge Air Temperature</P></TH></TR>
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Low Side</P></TH>
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High Side</P></TH></TR>
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13-16°C (55-65°F)</P></TD>
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0-100%</P></TD>
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200-283kPa (29-41psi)</P></TD>
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945-1234kPa (137-179psi)</P></TD>
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11°C (52°F)</P></TD></TR>
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19-24°C (66-75°F)</P></TD>
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Below 40%</P></TD>
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228-310kPa (33-45psi)</P></TD>
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1082-1413kPa (157-205psi)</P></TD>
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14°C (57°F)</P></TD></TR>
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Above 40%</P></TD>
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248-338kPa (36-49psi)</P></TD>
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1131-1469kPa (164-213psi)</P></TD>
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15°C (59°F)</P></TD></TR>
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25-29°C (76-85°F)</P></TD>
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Below 35%</P></TD>
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276-379kPa (40-55psi)</P></TD>
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1303-1696kPa (189-246psi)</P></TD>
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18°C (64°F)</P></TD></TR>
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35-60%</P></TD>
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276-379kPa (40-55psi)</P></TD>
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1310-1709kPa (190-248psi)</P></TD>
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18°C (64°F)</P></TD></TR>
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Above 60%</P></TD>
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290-400kPa (42-58psi)</P></TD>
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1358-1765kPa (197-256psi)</P></TD>
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19°C (66°F)</P></TD></TR>
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30-35°C (86-95°F)</P></TD>
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Below 30%</P></TD>
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317-434kPa (46-63psi)</P></TD>
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1544-2006kPa (224-291psi)</P></TD>
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22°C (72°F)</P></TD></TR>
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30-50%</P></TD>
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324-441kPa (47-64psi)</P></TD>
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1558-2034kPa (226-295psi)</P></TD>
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22°C (72°F)</P></TD></TR>
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Above 50%</P></TD>
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365-510kPa (53-74psi)</P></TD>
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1675-2179kPa (243-316psi)</P></TD>
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26°C (79°F)</P></TD></TR>
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36-41°C (96-105°F)</P></TD>
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Below 20%</P></TD>
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400-552kPa (58-80psi)</P></TD>
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1917-2503kPa (278-363psi)</P></TD>
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28°C (82°F)</P></TD></TR>
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20-40%</P></TD>
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393-546kPa (57-79psi)</P></TD>
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1910-2496kPa (274-357psi)</P></TD>
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28°C (82°F)</P></TD></TR>
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Above 40%</P></TD>
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400-552kPa (58-80psi)</P></TD>
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1910-2496kPa (277-362psi)</P></TD>
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28°C (82°F)</P></TD></TR>
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42-46°C (106-115°F)</P></TD>
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Below 20%</P></TD>
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448-621kPa (65-90psi)</P></TD>
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2172-2834kPa (315-411psi)</P></TD>
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31°C (88°F)</P></TD></TR>
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Above 20%</P></TD>
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462-634kPa (67-92psi)</P></TD>
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2220-2896kPa (322-420psi)</P></TD>
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32°C (90°F)</P></TD></TR>
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47-49°C (116-120°F)</P></TD>
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Below 30%</P></TD>
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531-731kPa (77-106psi)</P></TD>
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2379-3116kPa (347-452psi)</P></TD>
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43°C (109°F)</P></TD></TR></TBODY></TABLE>

I would just leave this alone Jonahs. I'll ignore the smartass google remark.

The table above is for the '03s A/C system. It is the max temp given ambient air temperature and relative humidity. You asked Intimidator what humidity had to do with it. Then proceeded to tell everyone they were wrong when they tried to explain it. Now you fling an insult and then attempt to cover up and say that the original question had nothing to do with humidity.

I guess all of the automotive climate engineers should just bow to your car wash experiments and forget the science behind their A/C performance table.

Not trying to cover anything but God man, get a sense of humor. They're those that live in the engineer world and those in the practical world. And it wasn't an insult. Get the . Sheesh