Charging a custom system.

[tbirdtbird]

BTW that hole in the firewall where the AC lines enter might be a problem, depending on how the under dash airbox is manufactured. To be safe, I would get some dense foam and stuff it in along side those lines, since it seems possible that hot underhood air can enter your airbox there.

[andrew vanis]

Coincidentally, Looks like MACS is asking this same question just yesterday and wondering what the pros do. It's like we could send them a link to our discussions here on AutoACForum.com.

https://macsmobileairclimate.org/2023/0 ... orking-on/

selected quote(s)

WHAT IS THE PROPER REFRIGERANT CHARGE FOR THIS A/C SYSTEM I’M WORKING ON?
By: Richard Hawkins, MACS Contributor

That is a question that comes up countless times when doing mobile A/C work.

When working on a car, light truck or SUV, it is a question that typically has an easy answer. Looking at an A/C decal under the hood, owner’s manual, or checking your information system will usually provide that answer. However, in a small percentage of cases, it can be an elusive piece of information. This information is still highly important, needed to properly service those vehicles.

Mobile A/C Scenarios
Some examples would be:

1. An aftermarket rear system was added with no refrigerant capacity provided.

2. A vehicle originally with a 6 MM “piccolo” condenser was replaced with a parallel flow unit. This requires reducing the charge and the supplier of the parallel flow condenser does not provide any charge reduction information.
.....
In a “follow-up” article we will compile the answers and provide the information needed to assess these issues. This will be an anonymous post. Thank you for your participation in advance!

Pam
October 3, 2023 at 9:43 am
What have you done when faced with these situations? Please share your experience. We will compile all answers in a follow up article. We would love to hear from you. Please email to info@macsmobileairclimate.org