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GM orifice tube

SeppW on Tue July 13, 2010 1:56 PM User is offline

I know this has been discussed ad nauseam, but the AC Delco catalog prescribes the following tubes for 95 Chevy Suburban K1500:

Part Number: 15-50121
Product Notes:
[All Makes-A/C Refrige orifice Tube]; Front unit, optional automatic adjusting orifice tube for normal ; climates (105 deg-); 4WD

Part Number: 15-5378
Product Notes:
[A/C Condenser Orifice]

Obviously, the 15-50121 is a variable type. Although the "optional" doesn't makes sense. Does not that mean it can locked to a certain position? Likewise, it reads like the 15-50121 is the OE for a 'Burb with rear AC, to me.

The 15-5378 says condenser orifice. Does that mean this orifice only fits the condenser, like a front AC unit only?

AMA lists two different as well, so not sure about them either.

If there any GM techs that might know what the factory service manual calls for, I appreciate the heads up. My alldata subscription yields zip

Thanks in advance


GM Tech on Tue July 13, 2010 3:04 PM User is offline

Condenser outlet orifice tubes will not fit evaporator inlet positions.....they are built differently- reverses of each other big screen is always upstream.....don't fool with the variable tubes- not worth the effort or money....

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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