Sharing..........


Log 104



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Compressor outlet temperature heating past 90C at car zero speed aka traffic jam ....is scarry prospect for longevity of the compressor.
I have always worried AC compressor being effected by engine bay (Underhood) temperature and engine metal temperature ( coolant temp ) via compressor mounting to the engine.



Above logs would be 4-5 months ago approx.


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This is the latest data after the AC System partial rejuvenation.


Log 283



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Log 284

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Log 283 and Log 284 ambient temp



If my AC compressor discharge pipe external temperatrure can be kept at 80C or cooler at all kind of use duty, it will have a very much longer life than being at 95C maximum.

The old ( partial ) compressor oil was brown already ( aging), albeit only 44,000KM max, but 11 years old and in operating hours it would be 44,000/20KM/H average = 2,200 running hours.
The 3 hoses I replaced and the partial oil surely have some moisture in them and so will the old filter drier, that is why I could never get lower than 300 microns previously.
All these small details count and we can see on now a cooler running AC compressor.

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How cold was all these 3 logs at Evaporator return to compressor pipe exterior ?





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The sensing location of the thermocouple at EVAP return pipe-hose



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You maybe wondering, why a spent R134A circuit is still so cold at average 5 Celcius / 41F ?
It is what it is with 2 Celsius EVAP setting, and later down the pipe-hose set to the compressor, this cold energy is used to cool down the hot condensed liquid R134A going to the EVAP via an IHX ( Internal Heat Exchanger ).

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End of Report.