This is in my 1989 F150 w/ a 5.8.

To start, The compressor and lines were replaced about 15 years ago BUT the shop that did it just did a half *** r134a conversion. Didn't flush system or replace the FOT from what I found. So all the crap from the old compressor has been floating around the system. Now since I have swapped the 5.8 into the truck the compressor has been open at the back for about a year or so. ANYWAYS this weekend I flush out the evap (didn't do the condenser although I probably should've), replace the FOT, reseal system, add in ester oil, pull a vacuum to 30 in hg for about 2 hours, it held the vacuum when I shut it off.

Then I recharged with r152a. Has similar head PSI's to r12. With r152a it takes about half the charge of r12. So I need roughly 24ozs give or take and maybe I over charged it. Anyways first things I notice is the low side is sitting at about 80 psi and High side is at 245 at idle. Ambient is about 100. Vent temps are meh. Raise idle to about 1500-1800 Low side drops to about 45 and high goes to about 250. Vent temps drop and outlet line to comp gets cold. Take truck for a drive and hit the freeway. Vent temps show low 50's on a 100 degree day. Get off the freeway and obviously vent temps go up at the stop light. The MOMENT I start moving or raise idle it instantly cools off.

Checked static psi today and both high and low were about 95 psi. Ambient is about 86.


What say you? overcharged???? I think I put about 3 10oz cans in. So I am thinking yes unless I have a comp issue. OR maybe I put orifice tube in wrong??
Forgot to add in...I thought it was just an airflow issue over the condenser but it's not. At least I am sure it's not. I was going to replace the fan clutch but got bored and wired up an efan I had sitting around.

Either way I am only 50 dollars into this so I am not complaining too much lol.

I have a feeling there might be some nay sayers of r152a. BUt on my 91 I had vent temps in low 40's on a 110 day. AZ is the place for a/c testing lol.

 

80 & 240 you are overcharged IMO, but not familiar with glide slope of R152A. I never even heard of it.

 

It's computer duster lol. Similar properties of r12. But I think you are correct!