Automotive Air Conditioning Information Forum

1) The manual control valve bleeds gas to control the crankcase pressure to change the differential pressure across the underside of the piston verses the piston top which in turn changes the swashplate cam angle or stroke and refrigerant mass flow. Early versions had internal filters which would ...

Syria could be a hot place to grow up. I designed and tested and trained retro fit installers for military a/c for Iraq at MIL spec 130 deg F ambient using Coriolis flow meters for refrigerant side capacity calculations..
Old Tech: Dad would replace the bucket of ice under the heater floor vent ...

bohica and crazy
single discharge valve on scroll can get trash under seat or rotate slightly away from discharge hole and still perform at 50%, but equalizes immediately. to see and repair valve problem :
1) Scribe/scratch line across front housing and also comp body as refrence for accurate ...

Time will tell if you are better off having ignored advice to get a genuine SD7H15 from Tim at A/C Kits?

only one belt is needed for 510 (162 cc) replacement SD7H15 (149.5) for R-134a and less vibration,
SD508 is only 138 cc.

Dead reckoning for computer think:
1) charge is too low or high causing abnormally high discharge gas temp. Yes, scroll system low charge results in high temp discharge as charge is lost down to aprox. 12%,
2) fans not working
3) limp home mode over ride due to drive line problem or radiator temp.
4 ...

York shelf life is influenced by the position of the comp during storage.The box is marked to store with the shaft face down so that the face type shaft seal is immersed in oil. The compressor is shipped with a holding charge which should remain. The old spec mineral oil has much more tolerance for ...

g'day mate,
PAG in R-12 system?
GM brochure GM-0011 indicates that removal of mineral oil during retrofit (mostly paraffinic in GM's case) is not recommended. Long story short, GM/USA avoids residual flush. OEMs are not all in agreement.
Mineral oil and R-134a are far apart on the polar compatible ...

SD7H15 Enhanced provides 12% better cooling by opening suction an discharge valves wider and also reducing re expansion of gas left in cylinder at TDC before suction down stroke. My original goal was to provide better cooling for diesel sleeper cab big rigs and off road vehicles. This model is 10 ...

I'd modify your Impala OEM AC to only use recirculated air (not 20% OSA) and a additional 100% hot heater water shut off in Max AC mode. Then your OEM AC would work as good as a Vintage Air HVAC replacement.
Additional Dynamat floor, under hood evaporator housing and firewall insulation helps ...