Volvo tractor a/c

[reefertech]

At high rpm when compressor cycles back on compressor purges briefly out pressure relief. Not showing high pressure on manifold gauges, compressor has been replaced, correct charge. This does not happen every time that compressor cycles on. Thanks in advance for your help.

[cadwaladr]

explain purges,my son does repairs to european volvo trucks do you mean it turns off/on?

[kelvin278]

Was drier changed, oil charge correct, evac to at least 500microns, liquid charged, how was it charged hopefully not straight to suction side of compressor. Speed reduction hub fitted?.

[charlie patt]

volvo truck with high side port on drier ? or dumper with high side port of condensor this is uk versions of course if prv opening either prv faulty or to high a pressure the test point may be the wrong side if you have a restriction ie on aftermarket kits ive had hp ports under cabs far far away from condensor with prvs opening up simply due to lack of fans when you say cycling do you mean hitting temp/ did the old comp do this? ive had comps fly to bits then block high side pipe did they do a flow check when fitting comp?