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I have a 1972 chevelle ss 454. I have ordered factory lines, compressor, condenser, and accumulator and poa expansion valve for r12. I will change oil, poa, 150. what else needs to be done with factory 1972 air for r134 refridgerant?

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Use pag oil with a dye. Helps finding leaks. Think you have everything you need. Put the dryer on last and keep it sealed to prevent mositure from getting in. Pump it down for at least an hour on a new system.

Some compressors come with a full charge of oil. Use the right amount of oil. Add to compressor and add a little to the dryer as well.

need some good votes, thanks

Posted on Aug 21, 2010

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Simply it's a valve in a refrigeration system that controls or meters how much coolant is allowed into the evaporator.
A thermal expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in refrigeration and air conditioning systems that controls the amount of refrigerant flow into the evaporator thereby controlling the superheating at the outlet of the evaporator. Thermal expansion valves are often referred to generically as "metering devices".
A thermal expansion valve is a key element to a heat pump; the cycle that makes air conditioning, or air cooling, possible. A basic refrigeration cycle consists of four major elements, a compressor, a condenser, a metering device and an evaporator. As a refrigerant passes through a circuit containing these four elements, air conditioning occurs. The cycle starts when refrigerant enters the compressor in a low pressure, low temperature, gaseous form. The refrigerant is compressed by the compressor to a high pressure-and-temperature gaseous state. The high pressure-and-temperature gas then enters the condenser. The condenser precipitates the high pressure-and-temperature gas to a high pressure liquid by transferring heat to a lower temperature medium, usually ambient air. The high pressure liquid then enters the expansion valve where the TX valve allows a portion of the refrigerant to enter the evaporator. In order for the higher temperature fluid to cool, the flow must be limited into the evaporator to keep the pressure low and allow expansion back into the gas phase. The TXV has sensing bulbs connected to the suction line of the refrigerant piping. The sensing bulbs give temperature readings to the TXV to adjust flow of refrigerant.[2]

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I am looking to convert the AC over to 134a. I have heard that the oil, the dryer and the expansive valve need to be replaced and then the system vacuumed out. where are the expansion valve and the dryer...

Look for the expansion valve where two of the AC lines connect together, usually near the radiator and the lines may be slightly different diameters, the larger one contains the valve. It is also VERY important to flush ALL of the old oil out of the system. Do this with an AC flush kit and all parts removed. Concentrate on the condensor and the evaporator after the hoses are flushed. Coat all 'o"rings and seals with AC oil when reassembling and be careful, leaks can happen and will be costly. Install 1/3 of system oil capacity in compressor and TURN the compressor by HAND after hoses are installed to it. OIL DOES NOT COMPRESS!! You may want to have a shop evacuate the system when ready.

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I am gone to put a new compressor on and somone recomended I change the expansion valve.Where is the a/c expansion valve locate and how do you change it?

It depends WHY its being replaced. If the compressor is destroyed and metal is in the lines, then the condenser should be flushed,and rubber lines replaced. It should be at the firewall where the lines connect to the evaporator. This is a job for a A?C shop. if you dont know what you are doing it can cost more.

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I cannot differentiate between the low pressure and high pressure

This is a little A/C 101. Follow the A/C lines. All A/C systems have a high pressure side and a low pressure side. The high pressure side is from the compressor to the condenser coil on the front of the vehicle to the evaporator coil in the dash. At the expansion valve in the evaporator the pressure drops. At the expansion valve the refrigerant changes from a liquid to a gas. This provides the cooling. The low pressure side is from the evaporator back to the compressor. Usually the high pressure lines are smaller than the low pressure (suction) lines.

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As much as you probably don't want to hear it, I believe it is time to replace the a/c compressor. Be sure to change the orifice tube while you are at it. The compressor should take approximately 8 ounces pf pag 150 and about 32 ounces of freon.

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1990 f250 air condition problem

Here is my opinion:
If you just change the type of refrigerant, there are many other things to consider.
The most important, i guess, is the fact that you have the change oil and accumulator receiver, along with a complete system cleaning in order to remove ALL of the type of oiul used for R12.
This is because, if you dont do this, the compressor will fail, due to the oil for R12 and oil type for a R134a system.
Try it this way, it should work good.
Also check your suction line valve for a clog or your gauge manifold blue line rubber gasket, and do not apply too much force when you hook the hose to the valve, as this may reduce the quantity of refrigerant going in the system.
Hope this help....

Good luck..........

Jul 08, 2008 | 1990 Ford F250

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