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Doing a v6 to LQ9 swap in my 2000 RCSB and I'm ready to install but need info help with the A/C. The 6.0 engine is from a 2005 Escalade and I'm wanting to use the same A/C compressor that came with the Escalade. It's a Denso 10S20F with no high pressure switch on the rear or any place to add one.
The wiring harness (2002 Silverado) dose have the high pressure switch connector though. Will running this compressor without the high pressure cutoff cause any issues? If so, can a pressure switch be add somewhere in the system? How dose this unit (2005) know when pressures are high and cycle off... PCM or...???
My system has a discharge line with a another (2) high pressure cutoff switch on the line coming from the compressor to the condenser. I figured that would work cutting the high pressure and installed the a/c system. On charging I couldn't get the compressor to run enough to take the freon. I figured (probably wrong) the ECM couldn't see the other high pressure switch on the compressor and shut the compressor down.
I went ahead and bought a new Denso compressor with the pressure switch and still had issues with charging. Took forever but finally got the 29 oz's in. I think the cold side fitting on my gauge set is bad. So I never was actually able to find out the answer... sorry.
All I know about the subject is the compressors and lines are different from 99-02 Vs. 03-up. though I am not sure where the actual Year break occurs on the systems.
I also know the pressure sensors are different between the years.
The first design uses a combined suction and discharge manifold with a single stud mount in the center.
All I know about the subject is the compressors and lines are different from 99-02 Vs. 03-up. though I am not sure where the actual Year break occurs on the systems.
I also know the pressure sensors are different between the years.
The first design uses a combined suction and discharge manifold with a single stud mount in the center.
The second design uses 2 separate lines.
Looking at Rock Auto's catalog the change between the 1st and 2nd design is ambiguous. My 2000 GMC lists both the 1st design HU6 style and also the 2nd design Denso. It maybe what plant the vehicle was manufactured at or it could be as simple as offering the Denso as an upgrade to the HU6.
I'm coming from a v6 swap so I had the choice between the two as I needed both the lines and the v8 compressor. My v6 system had a purple high pressure cutoff switch on the compressor along with a green high pressure cutoff switch on the discharge line, with it's wiring connector routed in the headlight wiring harness... why two high pressure switches... I don't know.
This was my thinking... since the system had the HP cutoff on the discharge line, the later Denso's without the switch (or even a place to install) would still work properly... It still may work. The new Denso came with a new purple cutoff so I am running the two like the v6 system had.
The Denso from a 2005 Escalade without the port for the switch.
04-05-2018, 10:26 PM
A/C compressor help (v6 to V8 swap)
