[xj40] A/C on high fan blows off and on short sequence

So I’ve gone thru all the searches and archives but have not
found a solution to my current problem.1994 VDP and the a/c
has been checked and the system is ok . It blows cold on low
and medium but switched to high fan it pulses on and off,
about a half second cycle. All the blower tests seem to
indicate all is ok there with flaps working fine. It blows
high with heater just fine. I suspect it’s a relay or some
other simple fix but I have no idea where to start looking.
Please help.
Dave–
1994 VDP Kingfisher Blue 76,000 miles
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