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Ac is not getting cold when ilde

Posted: Sun Oct 13, 2019 12:35 am
by MacAmb
Hello guys whats up.i have kia cadenza 2011 V6 3.5L.
Before a couple year ago I have noticed my car's A/C is not getting cold when it is idling and it make a little hissing noise this only happens sometimes when on a traffic so I have taken it to a repair and have checked the high pressure pipe was leaking so he replaced but after a few months the new pipe just got broken again so i took it to him again he said if you dont change the compressor it will keep breaking the H pressure pipe,so i have searched over internet all of the answers were pointed about expansion valve.so i want to make sure what is the exact problem could be before i waste my money on a new compressor.
Already checked those Freon level is 35 psi fan is working fine and debris and dust and the condenser is ok.

Re: Ac is not getting cold when ilde

Posted: Sun Oct 13, 2019 7:18 am
by Cusser
Can you provide both high and low AC pressures at about 2000 rpm? And are all the electric fans in the engine compartment spinning when the AC is on?

Re: Ac is not getting cold when ilde

Posted: Sun Oct 13, 2019 9:20 am
by MacAmb
Well i took this pic a while back ago but not 2000 rpm
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But yesterday i checked the low pressure at about 2000 to 3000 rpm the low side was 35psi

Re: Ac is not getting cold when ilde

Posted: Sun Oct 13, 2019 11:43 pm
by MacAmb
Updated:
at 2000rpm H was about 125psi
The L was 20 psi

Re: Ac is not getting cold when ilde

Posted: Mon Oct 14, 2019 6:45 am
by Cusser
MacAmb wrote:Updated:
at 2000rpm H was about 125psi
The L was 20 psi

Refrigerant leak. Or refrigerant low to start with after repair.

Re: Ac is not getting cold when ilde

Posted: Mon Oct 14, 2019 8:41 am
by MacAmb
Yea checked the pipes couldn't see any leaking .but what is causing Refrigerant to be low?

Re: Ac is not getting cold when ilde

Posted: Mon Oct 14, 2019 4:48 pm
by Cusser
MacAmb wrote:Yea checked the pipes couldn't see any leaking .but what is causing Refrigerant to be low?
A leak. Oftentimes a combination of visual inspection, UV dye, electronic sniffer, and soap bubbles must be used to find a leak.

Re: Ac is not getting cold when ilde

Posted: Mon Oct 14, 2019 5:08 pm
by bohica2xo
Well, we didn't have a Cadenza here in the US, but the 2011 Sorrento has the 3.5L V6.

The 3.5 has a direct drive compressor, with an electronic control valve. It runs 100% of the time.

So your issue could be an undercharged system, a bad control valve, a wiring issue or a worn out compressor.

Start with a scan tool. The OEM scan device can alter the compressor output manually for testing.

Re: Ac is not getting cold when ilde

Posted: Mon Oct 14, 2019 10:59 pm
by MacAmb
I used a soup bubbles but couldn't find a leak maybe its a small one.but i can see a little oil drops on the High pressure pipe surface.

Some others keep saying its an expansion valve

Re: Ac is not getting cold when ilde

Posted: Tue Oct 15, 2019 6:29 am
by Cusser
MacAmb wrote:I used a soup bubbles but couldn't find a leak
Well, I've heard that chicken soup can fix anything !!!

MacAmb wrote:i can see a little oil drops on the High pressure pipe surface.
That's what I mean with "visual inspection". If there's refrigeration oil getting out, so is refrigerant.