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A/C Compressor preventative maintenance

cody2979 on Mon April 27, 2009 11:38 PM User is offline

Year: 2002
Make: Chevrolet
Model: Silverado
Engine Size: 5.3L
Refrigerant Type: R134a
Country of Origin: United States

I purchased a 5.3L engine about 4 years ago with all the accessories on it for the purpose of installing it into a 1963 Chevy pickup that has been in our family for about 30 years. Okay, here is my question, I am just about ready to install the engine and I want to be able to use the compressor on the engine if possible, so what can I do to the compressor to lube it up or wet the seals so that I don't have problems?

The engine has been in my garage for about 4 years with the hoses still attached to the compressor and the ends bagged. I'm sure the seals are dry and it probably needs turned over some slowly to get things moving again before I crank it up.

Any thoughts?

bohica2xo on Tue April 28, 2009 2:40 AM User is offline

The HT6 compressor on that 5.3 is full of PAG oil. It will need to be flushed with fresh oil, just prior to closing up the system for evacuation & charging.

The bigger issue is the balance of the system. What do you plan to use for the evaporator, and the condensor?

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

cody2979 on Tue April 28, 2009 9:45 PM User is offline

I'm not sure which system I will go with...vintage air and hot rod air are a couple sites that have kits for my truck, but I would love to put together my own system. Any suggestions? How do I ensure that the system is balanced as you suggest?

bohica2xo on Wed April 29, 2009 2:37 AM User is offline

I was fairly certain your 1963 P/U did not have factory A/C... but many had add-on A/C hung in them later. It seems you are starting with a clean slate.

Let's start with the condensor & airpath. Your '63 may not even have a fan shroud right now, but you will need one to fit the LT engine you are putting in. I would use the largest Paralell Flow condensor that will fit in front of the radiator. If you have an automatic transmission, place any oil coolers behind the condensor, but in front of the radiator.
Make sure all of the air pulled in by the fan passes over the heat exchanger stack. Gaps between the condensor & radiator along the edge may be sealed with foam tape between the two heat exchangers, to prevent air from bypassing the condensor.

For the evaporator & cabin air handling equipment, there are several choices. The site sponsor has specilized in retrofit A/C installations for decades. It is very likely that they have a kit to fit your vehicle, give them a try: Arizona Mobile Air 1-602-233-0090 They also sell PF condensors, and can help you with the hoses.

Basically it is impossible to have too much condensor - at least in passenger vehicles. A large condensor with great airflow can reduce the head pressure significantly, extending system component life as well as providing better cooling.

Stay away from evaporator assemblies that do not have a TXV. Anybody selling a system with a fixed metering orifice using the terms "modern", "better", "updated", etc. is just full of crap. They eliminated the TXV to save 20 bucks per unit, and the clutch on the compressor just wears out faster.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

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