Sounds like an undercharge - Saab 9000 Bulletin Board - Saabnet.com
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Sounds like an undercharge
Posted by Kappy (more from Kappy) on Mon, 30 Jun 2003 10:59:42
In Reply to: AC woes, 4 mechanics stumped so far... any suggestions?, jbrew, Mon, 30 Jun 2003 10:47:01
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How much refrigerant did you add? Did you charge by weight or pressure.
As a general rule, I charge to a high side pressure of 2.8 times the ambient temperature at 1500 rpms. If charging by weight, add 30 to 32 ounces.
Even at idle, 160-170 on a hot day sounds like a serious undercharge. Your pressure differential is not great enough, and the high side pressure is not high enough, for a clogged evaporator. You have to check pressures at at least 1500 rpms to get a meaningful reading. If it's 100F, expect to see a high side of around 280-290 and a low side between 20 and 35.
posted by 64.222.83...
Posts in this Thread:
- AC woes, 4 mechanics stumped so far... any suggestions?, jbrew, Mon, 30 Jun 2003 10:47:01
- future plans, jbrew, Tue, 1 Jul 2003 10:35:22
- Suspect the clog is the key......., KeithR, Mon, 30 Jun 2003 18:51:53
- Same problem with different car..., Joe98, Mon, 30 Jun 2003 11:20:11
- Sounds like an undercharge, Kappy, Mon, 30 Jun 2003 10:59:42 <-- Viewing This Message
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