Evaporator Core/ AC question

kia
rio

#1

Hi there:), new to cartalk
When the AC went out in my car, the clutch engaged so i know it had refrigerant. i hooked up one of those gauges that attaches to a can of refrigerant. The gauge read that the system was overcharged so i didnt add anymore.then i used a set of manifold gauges, the low side had a high reading, and the high side had a low reading. After recovering the refrigerant i checked the expansion valve and evaporator core . The Expansion valve looked fine (but honestly i wouldnt know if it was broken or not), but the evaporator looked pretty dirty.
QUESTION : is there a way to clean an evaporator core , and if not what else could be causing the AC to fail?
Thanks:)
Also in the picture i attached, what is that wire connected to? is it a sensor? if so, could that be a cause of my AC not working?


#2

What were the readings?

I believe the wire running along near the top of the evap core is the thermistor that senses freezing conditions and turns the compressor off. I don’t think it would cause your problem.


#3

Sounds like a failed compressor to me.


#4

dont remember the exact numbers but the low side was at around 60 or 70 psi and the high side was at like 80 or 85 psi


#5

If the compressor clutch is engaged and those are your pressure readings, the system is slightly low on charge and your compressor has failed.


#6

You are now in the “take it to an expert” area. Find a good a/c shop in you area and have them diagnosis it.