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A few questions about replacing an ht6 compressor

jimsimm on Wed August 05, 2009 11:19 PM User is offline

Year: 1997
Make: Chevy
Model: Express 1500 Conversion
Engine Size: 5.7
Refrigerant Type: r134a
Country of Origin: United States

Hi, I have a 1997 Chevy Express Conversion van and I need to replace the compressor (and accumulator and orifice tube). The old compressor has an electrical connection in the back as well as on top but the NEW compressor (ht6) does not have the rear connection? I'm guessing this is an additional high pressure switch. Would it be appropriate to jump this with a wire and tape it up or do I need to bring this compressor back for another?

Also, their are two stickers in the engine compartment: one says "rear air, 4lbs 8 ozs of refrigerant", the other says "use an additional 7 ounces of refrigerant and extra pag oil" How much "Extra pag oil" does this mean?

And my final question is: do you know where I might find the orifice tube in this van?

Thanks for your help. I've done a lot of auto repair over the past 25 years including head gaskets and just about everything BUT A/C so your help is really appreciated!

chris142 on Thu August 06, 2009 12:26 AM User is offline

The new compressor should have a plug in the rear. Remove the plug and install the switch in the hole. You really need that switch and if the new compressor does not have a place for it then you need to get the correct compressor.
The sticker sounds like an add on rear unit. Are the AC lines all OE or is there funny connections? I'm guessing that it was a front AC only van and somebody added a rear unit. If so I'd go with the front specs + the 7oz recomended by the sticker.

As for oil. 3.5oz per pound of refrigerant is the norm. I'd add the full 3.5 oz since the lines are so long. My opinion anyway.

I can't remember exactly where the tube is in that van.

GM Tech on Thu August 06, 2009 7:52 AM User is offline

OT will be just beyond split to rear line- on liquid line right in front of evap inlet- underhood passenger side....

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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