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Posted by Tony on August 1, 2007, 5:53 pm
> We are having AC problems with a 2000 Honda CRV.
>
> We just did a successful vacuum and leak test,
> then recharged the system with 134a.
>
> At a constant 3000 RPMs, and with a set of AC gages attached
> to the low & high ports, the AC system does this:
>
> 1. The low pressure gauge rises in pressure until the high
> limit (low side) switch disengages the AC clutch.
You lost me on statement above, your low side switch on all
cars that I know of disengages at low pressure that is the way
you are temperature is controlled, this switch should disengage
at pressure just at or below freezing point perhaps 0-2 PSI.
what is freezing point look up chart
The high pressure gauge is within limits at this time.
>
> 2. When the low pressure gage returns to safe pressure, the AC
> clutch engages. This time the high side pressure gage begins to climb
> until it reaches the high side limit in PSI, and the AC clutch
> disengages.
> The high side pressure declines to a safe PSI and the AC clutch
> again engages. Now go back to #1 above and start the low pressure side
> rising to the upper limit. It is a continuous loop.
>
> The above is an endless loop of reaching max low PSI, shut off,
> reaching
> max high PSI, shut off, reaching max low PSI, shut off ...
>
> Even at a steady 3000 RPM, the above constant cycling does not do a
> satisfactory job of cooling the car.
>
> What's the problem?
>
> THANKS,
> Gene
>
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