Blue (Ford) orifice tube for better cooling - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jkk · 06-03-2018, 07:37 PM

Hey Guys

My 80 has a factory A/C that was originally R12 Freon now 134 the A/C compressor is a Sanden. I read that running a blue orifice tube will make the system cool better. The condenser is designed for R12 and the smaller orifice in the blue .067 compared to the OEM GM white tube is .072 will hold the Freon in the condenser longer allowing it to drop the coolant temp better. System currently runs 45 degrees at the vent.

Anyone ever tried this?

Thanks

68longhorn · 06-03-2018, 07:56 PM

I've never heard that one before. Did you convert the trucks ac to r134? Did you notice a difference? When i converted my truck all i changed was the freon and oil. There was no noticeable drop in performance on mine

DieselSJ · 06-04-2018, 08:24 PM

Over on the AC forums at ackits.com, the blue orifice tube is discussed and recommended frequently on systems that have been converted from 12 to 134. I know the system in my CC dually works well enough to make it uncomfortably cold even in Phoenix.

That being said, if you are getting 45 at the vents, I wouldn't open the system just to change the tube.

SunSoaked · 06-04-2018, 11:32 PM

Is the Ford blue tube a true
"drop in" replacement. Otherwise, are the dimensions exactly the same as the white OEM Chevy tube, except for the orifice size?

**hatzie** · 06-05-2018, 01:19 AM

Quote:

Originally Posted by jkk

Hey Guys

My 80 has a factory A/C that was originally R12 Freon now 134 the A/C compressor is a Sanden. I read that running a blue orifice tube will make the system cool better. The condenser is designed for R12 and the smaller orifice in the blue .067 compared to the OEM GM white tube is .072 will hold the Freon in the condenser longer allowing it to drop the coolant temp better. System currently runs 45 degrees at the vent.

Anyone ever tried this?

Thanks

If you're getting 45°F at the vents consistently you're done. Don't worry about it.

DieselSJ · 06-05-2018, 03:51 PM

Quote:

Originally Posted by SunSoaked

Is the Ford blue tube a true
"drop in" replacement. Otherwise, are the dimensions exactly the same as the white OEM Chevy tube, except for the orifice size?

Yes.

SCOTI · 06-05-2018, 09:01 PM

Quote:

Originally Posted by hatzie

If you're getting 45°F at the vents consistently you're done. Don't worry about it.

This is what I was thinking as well. That's pretty good.

06-03-2018, 07:37 PM	#1
jkk Registered User Join Date: Aug 2017 Location: Texas Posts: 423	Blue (Ford) orifice tube for better cooling Hey Guys My 80 has a factory A/C that was originally R12 Freon now 134 the A/C compressor is a Sanden. I read that running a blue orifice tube will make the system cool better. The condenser is designed for R12 and the smaller orifice in the blue .067 compared to the OEM GM white tube is .072 will hold the Freon in the condenser longer allowing it to drop the coolant temp better. System currently runs 45 degrees at the vent. Anyone ever tried this? Thanks

06-03-2018, 07:56 PM	#2
68longhorn Registered User Join Date: Jun 2007 Location: Cape Coral, Florida Posts: 1,123	Re: Blue (Ford) orifice tube for better cooling I've never heard that one before. Did you convert the trucks ac to r134? Did you notice a difference? When i converted my truck all i changed was the freon and oil. There was no noticeable drop in performance on mine __________________ 1986 Custom Deluxe 10 1978 Caprice 2 door - sold 1937 Chevrolet 2 door sedan - project

06-04-2018, 08:24 PM	#3
DieselSJ Registered User Join Date: Jun 2016 Location: Phoenix, AZ Posts: 574	Re: Blue (Ford) orifice tube for better cooling Over on the AC forums at ackits.com, the blue orifice tube is discussed and recommended frequently on systems that have been converted from 12 to 134. I know the system in my CC dually works well enough to make it uncomfortably cold even in Phoenix. That being said, if you are getting 45 at the vents, I wouldn't open the system just to change the tube. __________________ 87 R30 CC Dually, TBI 454, NV4500, zero rust barn find 87 Jeep Grand Wagoneer, 6.5 turbodiesel, 700R4

06-04-2018, 11:32 PM	#4
SunSoaked Registered User Join Date: Dec 2011 Location: Yuma Arizona Posts: 1,525	Re: Blue (Ford) orifice tube for better cooling Is the Ford blue tube a true "drop in" replacement. Otherwise, are the dimensions exactly the same as the white OEM Chevy tube, except for the orifice size?

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