Is it safe to assume that your r134 pressure is
neither too low or too high if your high speed
radiator fan cycles on and off at reasonable
intervals?   I can confirm the high speed cause by
turning the ac off when the high speed fan is on and
observing that the high speeed fan goes off?   The
assumptions I make is that at very low r134 pressures
the high speed fan will not be activated by the high
pressure ac relay and at very high pressure the high
speed fan will not go off.   This will only work with
the 86 on up models?   gary

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