Gain extra benefits by becoming a Supporting Member Click here find out how!

Classic Performance Products Classic Industries
American Auto Wire
Danchuk Catalog
Hellwig Products IncPerformance Rod & CustomNu-Relics Power Windows

Username Post: Under Dash AC Unit        (Topic#357735)
Posts: 57

Loc: Wisconsin
Reg: 10-23-08
08-20-19 04:48 AM - Post#2773633    

I'm starting here with the hope that someone can redirect me to a better forum if needed. I've found an under dash AC unit that I want to use in my 57 project and just checking to see if anyone else has redid one of these setups to use R134 refrigerant?

It's a Monitor Mark IV, which I think will look nice under the 57's dash. Looks just like the one I've attached to this post. I'm getting the condenser and compressor along with the under dash evaporator unit. Just wondering what all needs to be swapped or upgraded to use R134.

I'd post a picture but I don't know how to attach one directly to the message. If you search "monitor mark iv air conditioner" you can see what it looks like. Thanks for the help.

Edited by kck71 on 08-20-19 04:54 AM. Reason for edit: No reason given.


"15th Year" Platinum Supporting Member
Posts: 3247
Loc: So Cal
Reg: 06-07-05
08-20-19 06:05 AM - Post#2773645    
    In response to kck71

Not at all sure about that a google search for images reveals lots of variety.

In general, most all of us have stuck with the units designed for Tri5's.. Vintage Air being probably the most common.

But if you can get the unit to fit under the dash, get the compressor and condensor system setup to work with it, and run the type of freon that it long as it blows cold...then your done.

To post pics, you first need to place them on a hosting site somewhere then "link" them here. Otherwise, a gold level membership (I think) gets you able to post pics that sit on your computers drive.

57 Nomad -LS1 with C4 suspension
59 Apache Fleetside Shortbed BigWindow

Ultra Senior Member
Posts: 11434
Reg: 03-25-05
08-20-19 06:51 AM - Post#2773649    
    In response to kck71

It will be more efficient if you change the expansion valve for one designed for R134. You need to flush all the oil from the system, fill with 134 compatible oil, replace all the rubber hoses with newer barrier type hoses and replace the dryer. Check with Old Air Products for a compatible expansion valve in the evaporator unit.
Link to Mark IV

66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)

Edited by acardon on 08-20-19 06:54 AM. Reason for edit: No reason given.

Posts: 57

Loc: Wisconsin
Reg: 10-23-08
08-20-19 08:05 AM - Post#2773664    
    In response to acardon

Thanks for the info; that's what I am trying to figure out...what things should be replaced for R12 to R134a conversion. I've only got $60 invested in the whole setup so if it doesn't work, so be it.

Bruces 57 
Frequent Contributor
Posts: 2456

Reg: 01-03-07
08-22-19 12:09 PM - Post#2773821    
    In response to kck71

Probly wouldn't hurt to use a new style condenser for 134! (If what you have is the multi pass unit) Get it on that auction site! Just measure the one you have! (these are single pass with large tubes on the ends)
Also got my hands on some new refrigerant that works GREAT!!
It's called Maxi Frig! Also on that auction site! works with r-12 systems or 134 systems, no vacuum necessary! Just hook up and plug in the charging hose from the can!!! Works great!!!!



Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.186 seconds.   Total Queries: 16   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 11:44 AM