134A conversion.

[big2bird]

All my modern cars with 134A blow cold at 40*. Doug and I had the 80 and 81 converted to 134A, and the coldest we can get them is 50*. WTF is the difference?
The serpentine condenser vs a crossflow is not that much, is it?
Should we try a different orifice tube? I here the Ford unit (blue)might work better with conversions.:crap:

 

[mrvette]

It sounds like you doing fine there man, here in FLORIDA with all our humidity the best I can get from most any car is 50f on discharge....and only 55-60f on my vette....and that is with adjusting my POA valve, I have heard the Ford? blue orifice tube is better in later GM shark systems.....never did one, dunno....I settle for a MIN temp diff of 20f across the coil, top/windows down in open air and have seen up to 30f differnetial....

:sweat:

 

[010752]

Parallel flow (mini tanks on ends) is quite a bit better than the other two.
Most accurate way to charge system is to make sure the inlet and outlet temps of the evaporator are the same or as close as you can get. Makes a big difference. Run a pusher fan on the condenser if possible.
Cover the outside of the evaporator box with "Peel and Stick" roofing, aluminum to engine and then cover that with good alum a/c duct tape.
Your test conditions can make a big difference.

Make sure your rear hood gasket seals well. Notice how great the recirc was designed. :lol:

 

[big2bird]

I'll try some dynomat on the evap box. The condenser is staying as is. And yes, the ducting is stupid. Having the whole unit under the dash in the newer cars is far superior.

 

[big2bird]

I am begenning to think it would be better to switch back to R-12. The system was designed around the refridgerant, and the new systems are designed around 134A. I believe retrofit to be a no win scenario.

 

[mrvette]

I am begenning to think it would be better to switch back to R-12. The system was designed around the refridgerant, and the new systems are designed around 134A. I believe retrofit to be a no win scenario.

Toucans are enough for a shark....keep that in mind...anything more is too much....if you over charge the cooling goes down...damned if I know why anymore...but it does...

:suicide:

 

[big2bird]

I am begenning to think it would be better to switch back to R-12. The system was designed around the refridgerant, and the new systems are designed around 134A. I believe retrofit to be a no win scenario.

Toucans are enough for a shark....keep that in mind...anything more is too much....if you over charge the cooling goes down...damned if I know why anymore...but it does...

:suicide:

Sory Gene, the early sharks and late models vary alot in system capacity. 134a conversion takes roughly 80% of R-12 capacity.

 

[mrvette]

I am begenning to think it would be better to switch back to R-12. The system was designed around the refridgerant, and the new systems are designed around 134A. I believe retrofit to be a no win scenario.

Toucans are enough for a shark....keep that in mind...anything more is too much....if you over charge the cooling goes down...damned if I know why anymore...but it does...

:suicide:

Sory Gene, the early sharks and late models vary alot in system capacity. 134a conversion takes roughly 80% of R-12 capacity.

Around here, a 12 oz can is ten bux now...used to be 4 bux....

anyway, a system already converted seldom needs more than two cans....

20 bux......

maybe reconsider going back ????

:surrender:

 

[BRUTAL64]

I remember when I paid $1.35 a can for R12:amused:.

 

[mrvette]

I remember when I paid $1.35 a can for R12:amused:.

ME 2, thank the green weenies for that one, not sure it would make much difference over the years though....yet another way to force car sales up....

gotta retire the old fleet to keep the 'economy' going....

:shocking:

 

[SmokinBBC]

I drove my Ford Exp. round trip 300 miles yesterday in 93+ heat/humidity. I had to turn the AC way down because it got too damn cold in there. I have the AC seats in there as well which chills the bone. I just refilled the system back in early June...I used Artic Freeze Ultra Syn. 134A. I don't know how it compares to other refrig. but it seems to work really well.

When I converter my SB vette back in 2001, it would never blow as cold as my Exp. If I remember correctly, it was 55+ at best.

One of these days I'll do the BB. But it hardly makes sense since the tops come off in April and don't go back on until Oct.

 

[010752]

I am begenning to think it would be better to switch back to R-12. The system was designed around the refridgerant, and the new systems are designed around 134A. I believe retrofit to be a no win scenario.

That's illegal. :smash:

 

[big2bird]

I am begenning to think it would be better to switch back to R-12. The system was designed around the refridgerant, and the new systems are designed around 134A. I believe retrofit to be a no win scenario.

That's illegal. :smash:

Call the cops. I switched it back to R-12 today. 40*. (No animals were harmed in the posting of this message). Of course, finding the fresh air door stuck open helped also.:suicide:
I gave it a fair shot. 134A works fine in systems designed for that refridgerent, but sucks in a R-12 system.

 

[BRUTAL64]

I am begenning to think it would be better to switch back to R-12. The system was designed around the refridgerant, and the new systems are designed around 134A. I believe retrofit to be a no win scenario.

That's illegal. :smash:

Call the cops. I switched it back to R-12 today. 40*. (No animals were harmed in the posting of this message). Of course, finding the fresh air door stuck open helped also.:suicide:
I gave it a fair shot. 134A works fine in systems designed for that refridgerent, but sucks in a R-12 system.

Yep, pretty much what our customers have been tell me for 6 years. They go through the switch to 134a and the A/C doesn't get as cold as with R12.:smash: