Pro6TEN issues. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Awann99 · Yesterday, 09:57 PM

I recently converted my 72 k2500 to orginal AC using r134. I used a new Pro6Ten A6 compressor. Vintage air Parallel flow condenser annd drier. Everything thing else is new expect the evap core and POA valve which was changed to 27 psi.

I charged it with around 3 and half 12 oz cans of r134

My low side pressure is 55 high side is 250

It's blowing around 50 degrees.

It's 78 degrees outside with 85% humidity when I took these readings

The compressor needs to be super tight and then it still starts to slip after a few minutes. The belt size looks a little too wide at the top causing this. I'm going to get a 13/32 size belt and see if it helps.

Currently I can smell and see the belt getting burnt up when it slips.

So my question is does this sound like a failing compressor or just a belt squeal. Did I over fill the ac based on these readings. I feel like it should be colder.when the belt slips I can feel the compressor is hot to the touch. The only thing cold on the system is the POA line and evap core. It is sweating.

I also added 8 oz of PAG oil to the system before adding the r134.

Any help would be great. Thanks.

**Bob B.** · Yesterday, 10:49 PM

Low side should be somewhere around 25-35 psi, high side maybe 175-200 psi at that temp.. Check to see if the pipes into and out of the evaporator are both cold, close to the same temperature. You may be a bit overcharged or you may have poor air flow through the condenser, that will cause both the high and low sides to be higher than normal. 50 degree output isn't bad, you are seeing a 35 degree reduction in temp.. Doesn't sound like the compressor is giving up, just the pressures are too high and the belt is slipping. You have plenty of oil in it.

Awann99 · Today, 12:14 AM

Awesome. Thanks Bob. Both pipes coming out of the evap core were very cold. The compressor also pulls my rpm's down about 200 when at idle. You can really feel the HP pull when I'm driving. Turning it off when I'm
Driving feels like I'm letting off the brakes. Is that normal? This is the first truck I've driven with ac.

**Bob B.** · Today, 02:08 AM

A little bit maybe, but not much. My truck idles a bit slower with the A/C on, but I really can't feel it while driving.

Yesterday, 09:57 PM	#1
Awann99 Registered User Join Date: Jan 2018 Location: TN Posts: 259	Pro6TEN issues. I recently converted my 72 k2500 to orginal AC using r134. I used a new Pro6Ten A6 compressor. Vintage air Parallel flow condenser annd drier. Everything thing else is new expect the evap core and POA valve which was changed to 27 psi. I charged it with around 3 and half 12 oz cans of r134 My low side pressure is 55 high side is 250 It's blowing around 50 degrees. It's 78 degrees outside with 85% humidity when I took these readings The compressor needs to be super tight and then it still starts to slip after a few minutes. The belt size looks a little too wide at the top causing this. I'm going to get a 13/32 size belt and see if it helps. Currently I can smell and see the belt getting burnt up when it slips. So my question is does this sound like a failing compressor or just a belt squeal. Did I over fill the ac based on these readings. I feel like it should be colder.when the belt slips I can feel the compressor is hot to the touch. The only thing cold on the system is the POA line and evap core. It is sweating. I also added 8 oz of PAG oil to the system before adding the r134. Any help would be great. Thanks.

Yesterday, 10:49 PM	#2
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,320	Re: Pro6TEN issues. Low side should be somewhere around 25-35 psi, high side maybe 175-200 psi at that temp.. Check to see if the pipes into and out of the evaporator are both cold, close to the same temperature. You may be a bit overcharged or you may have poor air flow through the condenser, that will cause both the high and low sides to be higher than normal. 50 degree output isn't bad, you are seeing a 35 degree reduction in temp.. Doesn't sound like the compressor is giving up, just the pressures are too high and the belt is slipping. You have plenty of oil in it. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

Today, 12:14 AM	#3
Awann99 Registered User Join Date: Jan 2018 Location: TN Posts: 259	Re: Pro6TEN issues. Awesome. Thanks Bob. Both pipes coming out of the evap core were very cold. The compressor also pulls my rpm's down about 200 when at idle. You can really feel the HP pull when I'm driving. Turning it off when I'm Driving feels like I'm letting off the brakes. Is that normal? This is the first truck I've driven with ac.

Today, 02:08 AM	#4
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,320	Re: Pro6TEN issues. A little bit maybe, but not much. My truck idles a bit slower with the A/C on, but I really can't feel it while driving. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.



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