'91 940 r12->r134a

Discussion in 'Volvo 940' started by Telespalla Bob, Jun 16, 2008.

  1. Hi to all.
    I have a 1991 940 with A/C retrofited to R134a.
    Is it normal that the compressor continuously engages-disengages when
    running, with a duty of 20-30 seconds ON and 5-10 seconds OFF?
    The A/C systma has only the low pressure switch on receiver and a high
    pressure security valve on bottom pipe.
    Perhaps it requires more gas?
    it would have charged about 1 Kg (35.27392 oz, 2.20462 lb)

    many thanks.
    Telespalla Bob, Jun 16, 2008
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