I drove the 87 today with the pusher fan working and more refrigerant in the system. Center vent temps got down to 28F driving around before the compressor would cycle in 100F and 40% relative humidity. It was still around 44F at idle, but I think that is more a limitation of the Sanden 4261 on it. The Sandens 155cc is pretty weak at idle compared to the 210cc 10 cylinder Four Seasons 88947 on my 97. The 4261 is just not moving enough refrigerant. I can bring the idle up to even 1,200 rpm and it will drop to 38F. The fan is not moving much more airflow, but the low side pressure drops nearly 10 psi with the added RPM.
The condenser in that 87 is a $67 amazon special parallel flow that replaces Peterbilt 3S010633. It was easy to mount and retrofit in my R12 application with the the SAE fittings. The vans factory liquid line literally threaded into place and I was having to build hoses for the vortec compressor location and manifold connections anyway. I am limited in performance driving down the road by the airflow through the evaporator core at the moment. If I could get more airflow through the blower it would cool more. The fittings on the Peterbilt condenser are both on the same side and I am sure that it would not be hard to fabricate some lines to thread into the condenser, thread into the OE lines and hold the orifice tube on a truck needing it in the condenser outlet.
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