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Hi, my name is gustavo i have a hyundai accent 2012 with 91xxx miles on it. 6 months ago my a/c stopped working completely. I had it "fixed" but it was never like before, the car is not blowing cold enough during the day, specially when is very hot outside (i live in florida).
Early mornings and nights are ok with the a/c, but still not perfect. I took it to the dealer and they replace the compressor and charged me 697.44 usd for the compresor and inspection (137), labor was 239.61 after waving the inspection.

The thing is: the car is still blowing not cold enough and it had very little improvement with the new compressor. Driving with the car with the a/c in 2 you are sweating.

Just in case you want to know.
1. The system has no leaks
2. The compressor is brand new and engaging.
3. The air blower is working strong
4. The cabin filter is new
5. The fan of the radiator works properly

What else could it be? It looks like the dealer is having a hard time to figure it out.
 

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An auto AC specialist is a better place to take your AC related issue than the dealer. You may have paid for a new compressor and not need it. Anyways, you can also try and figure it out yourself by getting a set of ac manifold gauges. Plug it to your low and high ports and see what readings come up. This will tell you the status of your ac system. There will be several scenarios to it....like...... low - low, high - low, high - high, low - high. And each scenarios will point you to what the problem could be. Good luck.
 

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Check your heater control valve if the ac checked out ok. If the valve is not shutting off completely, hot coolant flowing in will surely make your ac feel warm than it should.
 

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Does the fan (condenser) go to high speed?
 

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Two other possibilities:

One) Problem with expansion valve sticking or plugging up.
However dealer should have recognized this possibility by low pressure side being to low and high pressure side being to high or low pressure to high and high pressure side normal, depending on expansion valve sticking to closed side or to open side. That’s what nitely was indicating about reading pressures with manifold gauges.

Two) Blend doors not operating correctly in HVAC housing. Letting too much heated air to blend with AC air. Also similar to what nitely said.
 

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I'll add this...If the blend doors are working correctly and the system is operating correctly you may have an issue with the foam seals around the mix door. May want to get in there and see what the doors are doing. I would think the dealer would find issues with the system if it were a problem.
 

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I bet it needs more freon. It should be cycling at 38F when all is cooled down and in recirculate. It takes a while for this to happen, maybe a half hour driving and if there is a lot of sun load will not happen. Just went through this with my Accent.


Have the high side pressure set to the upper limits of this chart.
 

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If it is one of the newer constant turning compressors they have issues with the control valve.
 

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Thanks for that chart RR. Recently used manifold gauges on my car, added refrigerant (so I thought) but unsure where numbers needed to be. It got cooler but I think maybe I need to check again, with numbers.
 

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Thanks for that chart RR. Recently used manifold gauges on my car, added refrigerant (so I thought) but unsure where numbers needed to be. It got cooler but I think maybe I need to check again, with numbers.
Do you have an AC machine? You need to be sure you have the proper amount of oil. You should evacuate and charge to specs. Pressures don't tell the whole story.
 

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Discussion Starter #12
Check your heater control valve if the ac checked out ok. If the valve is not shutting off completely, hot coolant flowing in will surely make your ac feel warm than it should.
Definitely will check that, the haven't still figure it out. they removed all the tubing and supposively found debris from the old compressor when it went bad. they clean it and still not blowing cold enough. i had another part changed for which they charged me 118 (front expansion valve), and installed it at no cost. but after that A/C went slightly worse. blowing at its best 55 F degree at the vent
 

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Discussion Starter #13
An auto AC specialist is a better place to take your AC related issue than the dealer. You may have paid for a new compressor and not need it. Anyways, you can also try and figure it out yourself by getting a set of ac manifold gauges. Plug it to your low and high ports and see what readings come up. This will tell you the status of your ac system. There will be several scenarios to it....like...... low - low, high - low, high - high, low - high. And each scenarios will point you to what the problem could be. Good luck.
Where can i find an A/C specialist? i have tried 3 places already including the dealer and noone knows. i have spent nearly 1,600 USD so far.
 

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Check your heater control valve if the ac checked out ok. If the valve is not shutting off completely, hot coolant flowing in will surely make your ac feel warm than it should.
i was just wondering.... is it possible to bypass the heating system? i live in florida, there is no need for heater here.
 

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i was just wondering.... is it possible to bypass the heating system? i live in florida, there is no need for heater here.
I you want you can remove the two hoses going into the heater core and join them.
Before doing that. If your AC is electronically controlled try this. A reset of the system.
Turn the system on full cold Max AC.
Radio OFF.
Turn ignition OFF.
Pull the HVAC (AC) fuse, leave out for 1 minute and replace.
Turn key to run/on position....NOT start.
Do not touch any controls. You'll hear the doors (actuators) being opened and closed. The HVAC module is learning the full open and full close positions. Wait until the system is completely done with the learning process. Less than a minute.
Start and test the system.
 
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