Freon Charge port

SURG933

MEMBER
2018 CHEVROLET SILVERADO
5.3L
V8
2WD
AUTOMATIC
45,678 MILES

Tried to recharge my ac on my truck, but I have two high side ports. Instead of one of each. Tried looking for the low side but no luck. Any ideas?

Sunday, June 5th, 2022 AT 4:54 PM

7 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

The port sizes are different, the large size is the high side while the smaller one is the low side. This guide can help you see what's going on and I have left instructions in the diagrams below:

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

and

https://youtu.be/uZrQCGwXfek

Does this truck take 1234yf refrigerant? 2018 was the slit year for 134a. The high side line is smaller that the low side line, In the images below the first will be the low side the next will be the high side line. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

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Monday, June 6th, 2022 AT 1:07 PM

SURG933

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4 POSTS

Ken L thank you.

Yes, sir, they should be different. But for some reason I have two large size ports.

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Monday, June 6th, 2022 AT 7:30 PM

KEN L

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The small line will be the high side for sure, I would look for a tag near the A/C to see if the refrigerant is 1234 Yf. This truck can be either, but since the connectors are the same I'm thinking 1234 Yf. I don't think a 134r gauge set will work.

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Tuesday, June 7th, 2022 AT 10:06 AM

SURG933

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Thank you, Ken. I will give it a shot as soon as I make it back home from work. The dealership is charging me $500.00 to replace the line. I will keep you posted. Thanks again

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Tuesday, June 7th, 2022 AT 11:20 AM

KEN L

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Please let us know what you find. We are interested to see what it is.

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Tuesday, June 7th, 2022 AT 7:38 PM

SURG933

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Yes, sir you were right on the 1234yf. R1234yf was created as a more environmentally friendly replacement to R134a. The biggest difference between the two is that R1234yf is mildly flammable and does require special handling. And it's a lot more expensive. Below is the link that'll break it down in more detail. Thanks a lot Ken.

https://rts.i-car.com/collision-repair-news/awareness-of-changing-refrigerant-types.html

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Wednesday, June 8th, 2022 AT 5:39 PM

KEN L

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I was afraid of that. I don't know why they would put a flammable refrigerant, sounds bad to me but I guess they know best, I do know last time I heard the BMW rejected it and is still using R134a. Thanks for the link.

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Thursday, June 9th, 2022 AT 6:48 PM