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Weighting r134

Bench on Fri July 16, 2010 6:40 PM User is offlineView users profile

Year: 2001
Make: toyota
Model: tundra
Engine Size: 4.7
Refrigerant Type: r134
Ambient Temp: 100
Country of Origin: United States

Would a food weighting scale work for weighting r134? My system takes 20-23 oz, and cans come in twelve oz. cans?

Chick on Fri July 16, 2010 7:04 PM User is offlineView users profile

just put two cans in, you're gonna lose some in the hose, you'll probably come in closer to the low number..or right in the middle...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Bench on Fri July 16, 2010 8:34 PM User is offlineView users profile

I did and it is blowing 50 at the vent and it is 97 degrees outside. is that good?

Chick on Sat July 17, 2010 8:03 AM User is offlineView users profile

almost cut the temp in half, I'd say thats fine.. also if the humidty is high, it has to work harder to remove the moisture from the air, a lot of factors involved..Try running down the highway and you'll see the vent temps drop to, especially on lower fan settings and night time..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Bench on Sat July 17, 2010 8:36 AM User is offlineView users profile

Thanks Chick.

iceman2555 on Sat July 17, 2010 9:07 AM User is offlineView users profile

There are two issues with recharging. One is of course cooling, the second and as important is the total amount of refrigerant within the system. The total amount on refrigerant within the system is necessary to maintain lubricant flow thru the system to maintain compressor longevity. OE specs indicate a charge of this system for 1.32 lb/21.oz. An undercharge of 5-10% may result in a decrease of lubricant flow. This offers a very small +/- option.
The use of a food scale, bath scale or other scale that may have a excessive +/- variation may not represent the true amount of refrigerant within the system.
Lubrication is the primary cause of compressor failures....OE units or aftermarket replacement units. The primary cause of this lubricant failure is undercharged systems or a restriction within the system.
Pressures alone are not a good indication of refrigerant charge.
Recently worked with a shop that began to experience severe compressor warranty issues with late model compressor failures. An evaluation of the failed compressors indicated that most all were 'dry' inside. Operation time of the units prior to failure indicated that the units had been charged properly with lubricant. The failure, however, was true lack of lubricant failure. After inspection of several elements of the repair procedure, technical service procedures and other issues that could arise, it was decided to test his recharge equipment.
As in many shops, the R&R machine was older and had not been properly serviced (don't laugh...when was the last time you techs serviced your R&R machine)?
It was discovered that the control/metering devices for monitoring the amount of refrigerant exceeded the recharge =/- specifications for his machine OE specifications. Over a period of time, use and abuse had affected the performance of the machine. Older AC systems with large recharge rates are not as suspect to this possible under charge, however, many of the late model system may actually be less than 1.5 or 1.0 lb system. The amount of refrigerant within the system is a most important aspect. It is doubtful that a 'food scale' has the ability to accurately measure the correct amount of refrigerant for a proper recharge of a system. Also keep in mind that when utilizing a manifold/hose assembly it is necessary to factor into the recharge equation the amount of refrigerant to pre-charge the manifold/hose assembly. This maybe on some manifold as much as 4 oz.


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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

daman on Sat July 17, 2010 11:43 AM User is offlineView users profile

Like chick said you always loose some in the hose etc..so i always put an extra oz or two to compensate. cooling is fine no compressor problems.

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'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

Bench on Sat July 17, 2010 4:59 PM User is offlineView users profile

Thanks iceman, you shed a lot of light on this subject. The food scale worked. After the first can was empty I reweighed it, and figured how much everything weighed before putting the second can in. Maybe it was luck, but it worked this time.

thanks for helping

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