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Re: Results of putting AC on gauges. Still mystefied.
Posted by Kappy (more from Kappy) on Fri, 17 Jun 2005 19:31:00
In Reply to: Re: Results of putting AC on gauges. Still mystefied., Captain Eddie Bob, Fri, 17 Jun 2005 18:43:00
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I was asking about the main fan behind the radiator, not the condensor fan. High side pressure should be read with the main radiator fan running since the radiator fan comes on somewhere around 250psi and will reduce the high pressure substantially. If you were hitting 250 at 75F ambient temp with the radiator fan running, you may have the charge pretty close.
Not to overlook the obvious, have you determined that the 12v power to the compressor clutch is cutting out with the rapid cycling. A possibility might be a failing clutch that can pull down for only a couple of seconds. Can you back probe the compressor wire with a multimeter or test light?
While I think you might have a slight undercharge, I really don't think low charge is causing the rapid cycling. The system is totally dumb to the low side pressure except for the anti-frost switch in the evaporator. While excessive low pressure could cause freezing in the evaporator, I doubt the evaporator is freezing at 21 psi on the low side.
The one possibility I can think of with with low charge is that there is not enough refrigerant in the system for the expansion valve to operate correctly. In that case, there could be refrigerant starvation at the evaporator and it would be freezing up. However, I don't think this is likely based on the low side pressure.
If it's not the anti-frost switch, I would start looking for an electrical problem. Maybe the foglight relay was no good either. Check the fuses. Check the connector at the pressure switch attached to the receiver/drier. Try jumping the pressure switch connector...
posted by 64.222.102...
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