Did they replace the fan clutch, make sure there is good air flow through the radiator?
Also checking the belt tensioner, to make sure it moves freely and not siezed up, and or the belt is not hard and glazed.
The symptoms that lead you to replace a compressor are not the same as the symptoms that would lead you to replace a condenser or evaporator.
Not knowing what pressures they they got at what rpms, on both the low and high sides, it is hard to diagnose. Then did they feel the lines and condenser or check temps of the condenser in various places?
A common mistake made by many shops is adding too much oil. I have seen that a lot over the years. Young guys reading instructions that say add X ounces of oil for this component and X amount for this component and then X amount for this component. Then they add extra for good measure. They don't realize they probably only needed to add about half of what they actually added. Few people know that too much oil over heats the system, it also reduces the freon's ability to transfer heat, if you have too much oil.
It's been a while, but at one point, I was fixing a lot of A/C systems that someone else replaced parts and started adding up oil charges and then added extra oil for good measure. Then wound up with a A/C system that would not transfer heat for crap, or overheated very fast. If both the high and low side pressures climb up higher than they should with the proper freon charge and there is plenty of air flowing through the radiator and condenser, you may have too much oil in the system.
Also checking the belt tensioner, to make sure it moves freely and not siezed up, and or the belt is not hard and glazed.
The symptoms that lead you to replace a compressor are not the same as the symptoms that would lead you to replace a condenser or evaporator.
Not knowing what pressures they they got at what rpms, on both the low and high sides, it is hard to diagnose. Then did they feel the lines and condenser or check temps of the condenser in various places?
A common mistake made by many shops is adding too much oil. I have seen that a lot over the years. Young guys reading instructions that say add X ounces of oil for this component and X amount for this component and then X amount for this component. Then they add extra for good measure. They don't realize they probably only needed to add about half of what they actually added. Few people know that too much oil over heats the system, it also reduces the freon's ability to transfer heat, if you have too much oil.
It's been a while, but at one point, I was fixing a lot of A/C systems that someone else replaced parts and started adding up oil charges and then added extra oil for good measure. Then wound up with a A/C system that would not transfer heat for crap, or overheated very fast. If both the high and low side pressures climb up higher than they should with the proper freon charge and there is plenty of air flowing through the radiator and condenser, you may have too much oil in the system.
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