A/C servicing; vacuum, oil and charge system? (1 Viewer)

[2001LC]

Seems a lot if you used 16oz cans. Overcharged will impact it's performance too.

Sorry 16oz, was a typo. 3x 12oz = 36oz. So I've estimated 37oz -+1oz. IIRC: 36 oz is only just above minimum capacity.

 

[flintknapper]

So I did get to around 45F. After re vacuuming and charging. Used a new: yellow hose and 134a resealable can tap. At first I got the same (52F) then bought new thermostat and saw improvement. But still not 45F or less. Then I add 3 more oz of 134a. Tmep hot ~43F. Seems I was underfilling, by using 3 16oz 12 oz cans. Likely due to loss while bleeding air from H & L lines to manifold and bleeding yellow between can swaps..

Now that COLO requires reseal cans. I can easily stop and store partially used cans.

~45F actually saw it hit the green (~44F) at L35PSI H220PSI
View attachment 3906226

The good thing about charging the system yourself (vs. taking it someplace) is that you can take the time to 'fine tune' the system.

'Chase' the last 2-3 degrees of vent temps. Adding or subtracting small amounts of refrigerant until you reach the point of diminishing returns.

A 'shop' is not going to do that. They want to get the vehicle in and out as quickly as possible.

When you get the vehicle up to highway speed and have had several cabin 'air exchanges', you should see even better temps. Good Job!

 

[flintknapper]

Sorry 16os, was a typo. 3x 12oz = 36oz. So I've estimated 37oz -+1oz. IIRC: 36 oz is only just above minimum capacity.

With rear air, you are fine up to about 38 ozs. Let the vent temps tell the story. Each system (because of previous service, wear, dirt, grime, etc) will be a little different.

 

[andrewderrick]

07 LC w/ rear air, never hooked up an a/c machine so can’t really comment on state of charge but no complaints on ac performance.
Ambient temp reading between 91-93F
At a stop saw 45-50F, while driving saw 43-47F
Coolant temp 193-197F