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2018 Silverado 1500 A/C Recharge after condenser replacement

Janderson28
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Janderson28 New Member

Janderson28

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Hi,

I recently replaced my A/C condenser. It had a leak last August so I didn’t bother to replace it until now. I hooked up a set of manifold gauges and vacuumed out the system. It holds a vacuum just fine but the truck will not take Freon. Any ideas what the issue would be? 

Janderson28 New Member

Janderson28

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No I’m not. Used manifold gauges and a vacuum pump. After I unhooked the vacuum I let it sit for 45 minutes. It held vacuum the entire time. After I tapped the A/C can I could see Freon go through the sight glass. It just wouldn’t flow into the low pressure line 

Snowcamo Senior Enthusiast

Snowcamo

Posted
Posted

I always fill the condenser first so it does not slug the compressor with liquid. Also allows you to fill the condenser with liquid and charge quicker. 

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

You basically have zero choice when it comes to filling the system with freon while using your own gauges. You only fill through the low side port, the freon is going to enter the system as a gas or liquid whether you like it or not.

 

Is your truck R134a or is it 1234yf?

 

I just did a car like 2 weeks ago with my gauge set using R134a. After I pulled vacuum and started to charge the system it had no problems sucking it down once I cracked the low side valve open.

Janderson28 New Member

Janderson28

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What do you mean zero chance? I’ve done this before with 134a. Same process you’re doing. 
 

This is a 1234yf system. The problem I’m having is it won’t suck into the low side port. As soon as I crack the low side on the gauge it will fill into the eye glass on the manifold gauges but will not suck into the low side port.   

Edited by Janderson28
CamGTP Senior Enthusiast

CamGTP

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For the hell of it what happens if you crack open the high side to trickle a little in. Maybe it'll start pulling the freon in then.

Snowcamo Senior Enthusiast

Snowcamo

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With the ac off, system in vacuum you are charging liquid via inverted can.  Charge it through the high side to spec and enjoy the ac.  

 

 

  • 1 month later...
No Tyme Senior Enthusiast

No Tyme

Posted
Posted

I would just be happy to find the low pressure line on my 18 Silvy 5.3. I seen videos of it being down low by the air box but I don't see it.

tbarn Senior Enthusiast

tbarn

Posted
Posted

I believe this will be your low side port. Not 100% sure though.Lowside.thumb.png.3a23a1fe7acee2f5a154788d528e07d4.png

  • Thanks 1
rav3 Senior Enthusiast

rav3

Posted
Posted
13 hours ago, No Tyme said:

I would just be happy to find the low pressure line on my 18 Silvy 5.3. I seen videos of it being down low by the air box but I don't see it.

 

  • Like 1
No Tyme Senior Enthusiast

No Tyme

Posted
Posted

LOL, they buried it to make it harder for the induvial and more costly to have it done... Thanks

No Tyme Senior Enthusiast

No Tyme

Posted
Posted

FYI, you will need a newer hose as the older charge hose for 134A will not attach to the 1234YF... if you can't find the adapter

  • 1 month later...
No Tyme Senior Enthusiast

No Tyme

Posted
Posted

Darn I forgot I posted this. After all the issues I was able to just add a bit of Freon to my system and it made a world of difference. Too bad you need to be a contortionist to get the job done. :banghead:

  • Haha 1
  • 1 year later...
GovtMule66 Enthusiast

GovtMule66

Posted
Posted
On 5/27/2023 at 1:57 PM, Janderson28 said:

Hi,

I recently replaced my A/C condenser. It had a leak last August so I didn’t bother to replace it until now. I hooked up a set of manifold gauges and vacuumed out the system. It holds a vacuum just fine but the truck will not take Freon. Any ideas what the issue would be? 

I realize this is a old thread but did you ever get your A/C System to take freon?   Thanks

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