AC cooling cuts out at highway speeds

Discussion in 'General Motoring' started by, Jul 30, 2003.

  1. 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?
, Jul 30, 2003

    James Sweet Guest

    It's probably low on refrigerant, there'll be more airflow through the
    condenser at higher speed.
    James Sweet, Jul 30, 2003
  3. Exactly.

    Also, at a little higher RPM, the compressor will be driven a little harder,
    and produce more cold.
    Pat Quadlander, Aug 1, 2003
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