AC Conversion -> Evaporator Core
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Junior User
Joined: Aug 2005
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AC Conversion -> Evaporator Core
Looks like in my area it'll be cheaper to convert to r134 than stay with r12. If I'm going to go that route, I'm going to replace the entire system so it functions properly.
That being said, does anyone know if the later style evaporator core, say '94-'96 (OBS), fit in the airbox of an earlier model, like my '89? If it doesn't, will the whole airbox fit on the truck?
That being said, does anyone know if the later style evaporator core, say '94-'96 (OBS), fit in the airbox of an earlier model, like my '89? If it doesn't, will the whole airbox fit on the truck?
Mountain Pass
Joined: Mar 2015
Posts: 200
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From: Hillsboro, OR
Looks like in my area it'll be cheaper to convert to r134 than stay with r12. If I'm going to go that route, I'm going to replace the entire system so it functions properly.
That being said, does anyone know if the later style evaporator core, say '94-'96 (OBS), fit in the airbox of an earlier model, like my '89? If it doesn't, will the whole airbox fit on the truck?
That being said, does anyone know if the later style evaporator core, say '94-'96 (OBS), fit in the airbox of an earlier model, like my '89? If it doesn't, will the whole airbox fit on the truck?
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Junior User
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There is a point. r134 will seep out of the hoses designed for r12 over time. So those need to be replaced. Which means all the components touching them do because they're in different locations. It gets hot and humid here and I don't want to have to deal with regularly recharging a cobbled together solution.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
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From: Kentucky
To the best of my knowledge the evap is the same size for R12 vs. R134a systems. As noted, the fittings are different. Should be a plug-n-play swap.
IIRC correctly Steve83 swapped in a complete R134a system that was already connected and charged. I think that was in his '83 Bronco.....
IIRC correctly Steve83 swapped in a complete R134a system that was already connected and charged. I think that was in his '83 Bronco.....
Posting Guru
Joined: Apr 2012
Posts: 1,693
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From: Menifee, CA
There is something to be said for the conversion fittings being spots that will leak. But so are the stupid little Schrader valves on the high and low pressure fittings. If you really feel the need to get a 92-96 evaporator, just get one from the JY and flush it out really well. But as sgip2000 memtioned, you do need the 92-96 condenser. Big time difference. Also, if you are doing this yourself, remember Ford had a TSB that they upped the r134a amount to 38oz.
http://www.thedieselstop.com/faq/949...les/941920.pdf
http://www.thedieselstop.com/faq/949...les/941920.pdf
Lead Driver
Joined: Feb 2002
Posts: 7,962
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From: Greater Austin, Texas
I converted my '91 F150 to R134a about 6-7 years ago and I replaced everything *except* the evap core. The fittings are different, so I had a custom liquid line made to fit the newer condenser and the older evap core. It didn't cost very much, I believe it was under $50. Oh yeah I put in a red orifice tube, replacing the blue one.
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Senior User
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That's correct on the red orifice tube, if you do switch to a later evap core (I did when I swapped my entire system) then the evaporator core box needs to have a notch cut where the top hose comes out because the later evaporator core has slightly different hose routing. A hack saw or dremel and some black rtv finishes it easily.
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