AC cooling cuts out at highway speeds

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news.west.cox.net

My 960's AC compressor cuts off above 45-50MPH on the highway, engine speed
about 2400 RPM. The blower motor is fine, by the way - no reduction in
airflow from the vents - just a loss of cooling like the compressor is
shutting down. As a test I drove around the block in first gear at 3000RPM
and the AC was cold, so it must be vehicle speed related.

Question is, why should the compressor operation be related to the vehicle
speed and is there a way to solve this mystery?
 
It's probably low on refrigerant, there'll be more airflow through the
condenser at higher speed.
 
Exactly.

Also, at a little higher RPM, the compressor will be driven a little harder,
and produce more cold.
 
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