2016 Hyundai Accent 100,000+ miles. About a month ago, A/C started to blow cold air initially and then would quickly fade to only blow hot. Remember over past year, year and half, where had intermittent, rare occurrence, issue with A/C only blowing hot air for a short period of time. Specific incident happened when idling stuck in traffic on interstate. Took to mechanic and was told compressor is bad and system needs to be replaced at about $1000.00. The mechanic said something about high pressure on the low side and low pressure on the high side indicating compressor is bad. Like this mechanic and used for several years with reputable service. Could it possible be something else (cheaper) that is an issue? Maybe climate controls, fuse, etc. Is there a thermostat of sorts that could be faulty telling the A/C not to cool?
Let the mechanic do his job, at that mileage its quite possible the compressor is tired.
I think your mechanic is correct. AC repairs are not cheap but $1000 is quite a reasonable price.
A/C issues are difficult to diagnose without knowing what the pressures are and how they are acting during operation. At this point I would advise getting another opinion or two without telling anyone what the previous guy told you.
Granted, it could be a failed compressor but I tend to think the cause is something far less serious. Expansion valve, compressor short cycling due to refrigerant charge state, etc.
Without knowing pressures and how this diagnosis was arrived at I can only theorize.
Last point. IF the compressor has genuinely failed, then that 1000 dollars sounds a bit cheap. I hope this guy is not planning on just throwing a compressor on there and hoping for the best. The expansion valve should be changed along with the accumulator and the entire system flushed out. I don’t see that being feasible for only a 1000 dollars. If the mechanic you mentioned is a “compressor only” guy then I feel (personal opinion only) you should not trust him to do this repair as it is incorrect.
I sort of worry about this as well. It’s possible for a failed compressor to leave debris in the AC coolant lines. Install a new compressor without removing all the debris, new one get damaged by the left-over debris, and then you have not one, but two failed compressors. Suggest to ask your mechanic if this is a concern in your car’s case. Certainly seems possible for a compressor to fail, yet not fail w/ enough damage to contaminate the lines.
I’d find a different AC guy.
Here are the possibilities
- Expansion valve stuck open
©, 2020 Rick Muscoplat
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