Automotive Air Conditioning Information Forum

Maybe the diode in the clutch harness on the compressor or the TPS (thermal protection switch) mounted at the rear side if the compressor housing has failed open due to reverse polarity or a negative voltage disengagement spike or back EMF from fan problems.
The TPS is intended to disengage the ...

Opportunity for improvement/learning curve for next AC service:
Evidence of a good compressor is to pump up to the PRV (pressure relief valve) pop off pressure about 420 psi (the first time) and blow out oil with leak dye and R-134a.
hotrodac

Sanden's Singapore factory makes a SD5H14 (134a version of SD508) with CCW specs.
SD7V16 CCW spec is used on VW diesel CCW engines but has some past problems with frisbee clutch armature plates when the CW shaft nut unscrews due to bad torque, surface finish or shaft spline loosness.
Standard SD508 ...

I documented and installed a modified Vintage Air HVAC in a 1961 Pontiac Bubble Top 389 with a Sanden SD5H14 compressor which is covered in Chapter 10 of "How to Air Condition Your Hot Rod" (book available from Vintage Air). I was able to install a adequate modern parallel flow condenser with heat ...

Compressor built by Sanden in JAPAN with Sanden SP-10 double end capped PAG same as ND pag and similar to PAG 46 viscosity.
Other applications of the SD7-B10 use only 3 oz. because the body ported compressor utilizes all suction flow through the crankcase to supply cool oil continuously directly to ...

No more validation testing focus or that type of problem solving, but AG dry lock is a really big deal. Deere has several OEM counter measure designs.
hotrodac

Just a theory: after daily crankwashout of PAG from thermal migration of R-134a w/o daily operation, the bearing surfaces are squeeky clean.
Mineral oil is not solubable with R-134a so some should remain on bearings to survive 2500 crpm startup. One of the lube enhancers may work better than 5GS as ...

Ag applications can cause liquid slugging and oil wash out of the compressor.
Additional R134a without appropriate oil charge increase would magnify "Dry Lock" of compressor.
Cool mornings (and cold compressor) with sun on the cab and warn evaporator will cause liquid migration to suction.
Some ...

Encyclopedia 2x0! Heck, I knew that.
hotrodac

Don't think AGCO made any changes in CAT design spec's.
Maybe thermostat is not operating and clutch cycles on low ambient 6 psi switch, causing evaporator icing.
System is unique in that accumulator is a counter measure against liquid slugging on a thermostat clutch cycling system.
Saw a yellow ...