My 63 CDV factory A/C was trash so I replaced every part in the system and converted to R134 . I also installed a STV bypass kit which eliminated the STV all together and converted the system to a cycling system.  I vacumed and charged the system with 36oz of 134. The system is cycling as it should and the pressures are right at 250 high side, cycle off at 25lbs and cycle back on at about 35lbs. It is making plenty of water on the low side hoses and evaporator drain. There is very good air flow through the dash vents .

My problem is this, the best I can do on the vent temps is about 50-55 degrees on a 90 degree day, sitting in the garage or going 65 mph. At that temp I am barely able to keep from sweating. I have checked and double checked the outside air intake and it shows to be operating as it should , shutting off outside air while on recirculate. The techs (where I bought my parts} are great but they were unable to lend any ideas that I had not tried.

I am wondering if anyone has had a similar problem. 

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Comment by Dana G Cooper on August 1, 2018 at 8:15pm

Update: Replaced the Expansion valve with the correct valve. Still about the same results. Just to be clear, everything in the system is new, including the evaporator. One question, what position should the cycling switch sensor tube be placed on the evap outlet tube ? I have mine clamped to the tube right next to the expansion valve capillary.

Comment by Clovis on August 1, 2018 at 3:51pm

Thanks Mark, I did read that but you never know what one person's replacement of everything means to another's. It's also good for future readers to see how a system my not be operating at it's best. But I defer to you for the more detailed end of things, I'm still confusing evaps and condensers LOL

Comment by Mark S Anderson on August 1, 2018 at 3:08pm

Clovis, according to the original post it's new.  

Comment by Clovis on August 1, 2018 at 1:08pm

It could be this also

Comment by Clovis on July 27, 2018 at 10:41pm

Tony nice to hear from you. Yes my life has been very busy and not focused on my cars unfortunately. I sold some land and my sawmill and had to move many many trailer loads of wood and timbers to my cottage. $3500 in fuel in two months for my truck. I bought another island to either flip or rent out and have been doing tons of work on it. I've driven my wagon twice this year and the caddy is still apart. It looks like we've got some great people on here helping out along with your sage advice. Lots of excellent in depth knowledge from them. Still loving my Cadillac just no time presently to play with it. 

Comment by Mark S Anderson on July 27, 2018 at 4:53pm

The correct TXV should definitely fix your problem as you described it.   There are two types available, i believe,  one with a straight sensing bulb, or the original style which wraps around the evaporator outlet line.  
If you are going to use the straight style bulb,  be sure to mount it with the bulb pointing down, and the capillary tubes pointing up.  If you don't, the liquid in the bulb will run down to the valve and the valve won't respond to temperature changes properly.  

Comment by Tony and Ginny 429 on July 27, 2018 at 4:51pm

It will all be worth the --Blood Sweat and tears once the AC is up and running
Your best days in the car are in the near future

Comment by Tony and Ginny 429 on July 27, 2018 at 4:46pm
Hey Clovis

How are you --guy ?
Glad to see you are stopping by the sight
I had a post on here asking how you are
Kevin answered --said he speaks to you and all is well on your end -- just busy

How is the Super High teck 64 sedan FItech intake Cadillac coming along ?
You SB out and about with the car this time of the year where you are

Your last note indicated that you needed more fuel pressure at idle and a fuel pump in the gas tank might be needed

I want you to know that i wrote this same note twice --only not to have it post for one reason or another on the sight when i tried --go fiqure

We need more guys like you on here-- with your very high level of mechanical skills to inspire us

Comment by Clovis on July 27, 2018 at 3:39pm

Great news, there is nothing better than being cool in a cool ride.

Comment by Dana G Cooper on July 27, 2018 at 2:25pm

After much research and help from many of you, I found I was sold the incorrect expansion valve. The vendor is sending the correct valve and I am pretty  confident it will fix my problem. I will keep you updated !


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