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REAR TVX on Dual a/c 94 95 Suburban,, flood back fix

zzljg on Fri July 03, 2009 10:18 AM User is offline

Year: 95
Make: Chevy
Model: Suburban
Engine Size: 5.7
Refrigerant Type: 134a

The fix in the bulletins for the 94- 95 suburban rear unit flooding back to the R4 compressor ,,and then it starts getting noisy and knocking and then failure,,they indicate changing the rear TXV as the fix,,,,however there isn't any wraping around the pigtail,,, without wraping or insulating the pigtail to prevent exposure to ambient air temp. I guess I don't seee how it can work properly with this exposure,,,,,It just seems like that might be more of an issue than just changing the valve,,,,,Just changing a valve you might just get a China import,,

Any thoughts on this ??

ljg

Edited: Fri July 03, 2009 at 12:00 PM by zzljg

TRB on Fri July 03, 2009 10:44 AM User is offlineView users profile

Capillary tube should always be wrapped to achieve a proper reading. As far as China products I would not knock them if the right supplier is used. Seems everyone loves to complain about China products! Reality is they are no more of an issue then any other supplier in the industry. You just have to know your source and the standards they require for their import suppliers.

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zzljg on Fri July 03, 2009 12:56 PM User is offline

Thanks for the reply on the TXV pigtail,,,I have no idea why they don't wrap them ,,,I'm starting to think that this whole dual air system is not designed very well,,,

As a far as the China imports and quality ,I have friends in wholesale business who say just about exactly the same as you , I have an inventor friend of mine who has made it big ,,,they took one of his company's products to China to be manufactured,,he said the quality was very good , but, someone has to be right there to keep tabs on them all the time or it isn't so good,,overall he said he thought it was good move,,



Thanks again
ljg

GM Tech on Fri July 03, 2009 1:54 PM User is offline

the key to that fix is to have the capillary tube touch the suction pipe where the capillary has refrigerant in it-- the "dead spot" is above the crimp- don't let any dead area alone touch the tube-- I always clamp 3 or 4 inches of the capillary to the suction pipe-- the factory had been attaching the capillary such that the dead spot was the only contact point, and that was what caused the flooding- I was the one who originally analyzed this snafu back in Texas in '94.....wrapping is good but was not necessary as long as there was solid contact tube to tube- for 2 or more inches...

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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......

torque395 on Fri July 03, 2009 2:21 PM User is offline

Its been about 2 years since i've been into my suburbans rear AC, but if i remember right the TXV is attached right to the rear evap core and the whole assembly is, of course, inside the heat/AC box. This may have been the permanent fix for the system and no wrapping of the pipe would be necessary since the whole thing would be inside the box exposed to the conditioned air. But like i said its been two years i cant remember everything. I suppose the TXV could be on the ambient side, but i wouldnt think so. I just couldnt see them making a mistake like that.

My truck is a 96 and isnt a part of the 94-95 issue so I'm trying to figure out what it is that they did to fix the problem. There were a few changes such as a the HT6 compressor for 96 and the compressor is on the drivers side instead of passengers side for the 95.

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1996 Chevy Suburban 2500 4x2 6.5L Turbo

TRB on Fri July 03, 2009 2:25 PM User is offlineView users profile

Quote
Originally posted by: GM Tech
the key to that fix is to have the capillary tube touch the suction pipe where the capillary has refrigerant in it-- the "dead spot" is above the crimp- don't let any dead area alone touch the tube-- I always clamp 3 or 4 inches of the capillary to the suction pipe-- the factory had been attaching the capillary such that the dead spot was the only contact point, and that was what caused the flooding- I was the one who originally analyzed this snafu back in Texas in '94.....wrapping is good but was not necessary as long as there was solid contact tube to tube- for 2 or more inches...

I also prefer to attach the tube to the bottom of the suction outlet.



-------------------------
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Contact: ACKits.com

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