1969 Deville: A/C Expansion Valve Screen

[69Deville]

Hello all,

I am in the process of replacing my evaporator, POA valve, and expansion valve for my 69 Deville. I have a new reproduction expansion valve (not NOS, pic attached) and it doesn't seem to have a screen inside of it. My old original one had a screen and I have a replacement NOS one on hand (pic attached).

I am wondering if there needs to be a screen in it since my NOS screen won't fit and the new one seems ready to install.

Thanks,
Dave

["Cadillac Kid" Greg Surfas 15364]

I would not install an expansion valve
Without a screen or filter before the valve.
Greg surfas

[69Deville]

Thank you Greg.

So the expansion valve is stamped on the top with R134A. Can it be used with an R12 system as I want to stay original? With the issue of the screen and the stamping on the top, I am tempted to pay a bit more and purchase a NOS expansion valve.

Or I could always cut the screen and crimp it to shorten it and make it fit the new valve.

["Cadillac Kid" Greg Surfas 15364]

TXVs are VERY refrigerant specific as far as operating temperatures, [pressures and calculated super-heat, so although the valve would be close I would suggest going with an R-12 valve.
Greg Surfas

[69Deville]

Thank you Greg. I'll pick up an original NOS one. After tearing out everything, this is definitely a task I don't feel like doing twice.

[fishnjim]

Make sure you clean and flush everything and evacuate for moisture before filling or you will be back in there...

[69Deville]

My next steps are to:

-Reflush condensor
-Flush hoses
-Drain old oil from compressor
-Reoil components per shop manual with mineral oil
-Replace Drier
-Reconnect components
-Take to AC shop
---Evacuate system
---Pull vacuum
---Fill with R12
-Say prayer
-Test system

The shop I use for R12 is an hour from home and the owner is very knowledgeable on classic R12 systems. So this leads to a few questions.

-Should I wait to connect the new Drier until I get to the shop and then have him immediately evacuate the system?
-Should I flush the new evaporator prior to installing
-Anything else I am missing?

Thanks

["Cadillac Kid" Greg Surfas 15364]

Should I wait to connect the new Drier until I get to the shop and then have him immediately evacuate the system?
Yes


-Should I flush the new evaporator prior to installing
certainly can't hurt.


-Anything else I am missing?
Be sure and pressure test the system before you charge it.  Leaks that don't show up under vacuum will appear under pressure. When you have the system under a vacuum the o'rings are pulled into any open space in the line, and when under pressure the travel is in the opposite direction, away from the tubing and fittings

Greg Surfas