90 AC with Parallel flow condenser and R12

[-=Jeff=-]

SO I think I have a good charge in the system finally. Compressor is working. Parallel flow condenser replaces the tube and fin

Yesterday with the Temp in the mid 80s it was blowing 50 and a bit less the 50 out the vents. So Ia m getting at least a 30 deg variant from the Ambient which I understand is good.

my next task is to determine how to get more Volume out of the system. I think I have a couple areas in the dash that need attention ( I am thinking the foam in a couple spots is leaking, but I am also trying to determine if I need a different blower motor or a different squirrel cage for the current motor.

I have talked of a suburban blower in the past, but not tried it yet, although if it spins at the same speed as the Vette one the only difference there could be is the squirrel cage.. still trying to figure that one out

[-=Jeff=-]

I should add, the Evaporator looks clean and clear as well

[scottfab]

I should add, the Evaporator looks clean and clear as well

Isn't that kinda expensive using R12 still?

[-=Jeff=-]

I got the R-12 for about ~30-40 per can

R134a is not the $6 per can, last I saw it was closer to 20. plus the r12 runs lower head pressure too

A/c seems to be working fine, just need to figure out the air volume issue

[cvette98pacecar]

I got the R-12 for about ~30-40 per can

R134a is not the $6 per can, last I saw it was closer to 20. plus the r12 runs lower head pressure too

A/c seems to be working fine, just need to figure out the air volume issue

Jeff that was one of the reasons that I pulled my dash apart. I had noticed that when I ran the Air I was getting pelted with small pieces of insulation. I took all the duct work out, replaced all of the damaged pieces and re-glued all of the old pieces.
Advanced Auto has R134A for 130.00 a drum. I think the sale is over at the end of the June.

For everyone with a 90-92 that still has R12. If you blend R134A and HFC-12 you get the same temperature glide and temperature curve of R12. The draw back is you will however have to upgrade all of the seals and oil.

[-=Jeff=-]

Jeff that was one of the reasons that I pulled my dash apart. I had noticed that when I ran the Air I was getting pelted with small pieces of insulation. I took all the duct work out, replaced all of the damaged pieces and re-glued all of the old pieces.


Did the Air volume improve?


For everyone with a 90-92 that still has R12. If you blend R134A and HFC-12 you get the same temperature glide and temperature curve of R12. The draw back is you will however have to upgrade all of the seals and oil.

or buy r12 on eBay, although you need your 609 Cert

[scottfab]

I got the R-12 for about ~30-40 per can

R134a is not the $6 per can, last I saw it was closer to 20. plus the r12 runs lower head pressure too

A/c seems to be working fine, just need to figure out the air volume issue

I converted mine to 134 about 6yrs ago. Did not replace the seals. Just used new oil, orifice, compressor and dryer. No problems in 6yrs.

I did have an air flow problem about 10 yrs ago. Turned out to be the contacts to the control unit as I remember.

Also I bought 12 cans of 134 at a store called Bi-Mart here in the NW for $5/can. I've never seen $20 a can.

[-=Jeff=-]

Also I bought 12 cans of 134 at a store called Bi-Mart here in the NW for $5/can. I've never seen $20 a can.

Recently?

I looked on line just before lunch.. O'Reilly's is $20 for a 12 oz can of R134a

5 years ago it was $7

[scottfab]

Recently?

I looked on line just before lunch.. O'Reilly's is $20 for a 12 oz can of R134a

5 years ago it was $7

I know it was not last year. Probably the year before.
I never buy stuff like this at a strictly automotive store.
BIG MARK UPS.

Pep Boys has it at $18 with $10 off if you buy 6 cans.
Good till the 30th. Must use this coupon.
http://www.pepboys.com/sale_specials/coupons/20_off_merchandise_purchase_of_100_or_more_cp/

[Mystic ZR-1]

Just had my AC recharged today @ my local Chevy dealer
I normally scorn them but they had R12 in stock...
No leaks that they could find. $34.25 a 12oz can, 2 cans.
I remember paying 79 cents a can @ Pep Boys years ago!
The compressor probably has a slow leak somewhere, but after
all, it's 22 years old... (no way is the dealer gonna replace that,
for the obvious reasons...)

[-=Jeff=-]

with ambient around 85-90 today, car was blowing 52deg out the vent ( not on Recirc) I think it is working fine..

[scottfab]

with ambient around 85-90 today, car was blowing 52deg out the vent ( not on Recirc) I think it is working fine..

Which vent?
And AC set to what temp?

[-=Jeff=-]

Which vent?
And AC set to what temp?

Center

Temp was all the way cold ( manual AC)

[cvette98pacecar]

Which vent?
And AC set to what temp?

Temperature setting has nothing to do with the operation, it will only allow the AC to run longer to the get to the target set point.
It is not like you are controlling an outside damper threw a analog signal which will proportion the amount of outside air that is being entered into the cockpit.

Jeff, the airflow did not go up. the squirrel cage is rated at X CFM without changing the speed of the motor or the pitch of the blades on the squirrel cage the rate of flow will not change.
If you go to a larger squirrel cage make sure you dont over amp the motor, and be careful that you dont choke the inlet surrounding area. Just like our engines you can only exhaust what you bring in.

[-=Jeff=-]

Robert,

I was thinking more along the lines of a different pitch Cage.. although I was fairly comfortable yesterday with the AC in the car.. If the hatch had the vent out and I had it on recirc it would be interesting to see how well it does.

I have one issue where when I come to a stop the car wants to die with AC on. I adjusted the idle adder for AC which helped, but it still drops down and bouces up. Car died once because of that. Once I figure out and fix it, I should be good to go

[-=Jeff=-]

AC is good by my standards tonight around 6pm, it was somewhere between 85-90 ambient

Oh and this was WITH Recirc..
https://lh3.googleusercontent.com/-tZt5jdgyNnM/T-5HssuO4pI/AAAAAAAACqw/_dKTDbLPW7U/s1152/2012-06-29_18-11-18_487.jpg

[scottfab]

Temperature setting has nothing to do with the operation, it will only allow the AC to run longer to the get to the target set point.
It is not like you are controlling an outside damper threw a analog signal which will proportion the amount of outside air that is being entered into the cockpit.


I'd normally let this bogus statement slide but worry that someone might believe it and therefore possibly get the wrong results and yet have a perfectly good system.
It has been claimed that "Temperature setting has nothing to do with operaton"
If the temp setting just happened to be set to say 80deg or so you will not get the desired lower temp. It's best to be sure.
I recommend checking the temp setting for the lowest setting that way there is no confusion about what you're asking the system to do.
AND it will do it for a long time.
OR lets say the temp setting was at 72 and you are in a garage with no sun load. The AC does it's thing based on sun
load worked in. If the car's inside temp is close to the 72 mark the AC will not be as cold even if the outside ambient is 80-90.

[VetteMed]

I'd normally let this bogus statement slide but worry that someone might believe it and therefore possibly get the wrong results and yet have a perfectly good system.
It has been claimed that "Temperature setting has nothing to do with operaton"
If the temp setting just happened to be set to say 80deg or so you will not get the desired lower temp. It's best to be sure.
I recommend checking the temp setting for the lowest setting that way there is no confusion about what you're asking the system to do.
AND it will do it for a long time.
OR lets say the temp setting was at 72 and you are in a garage with no sun load. The AC does it's thing based on sun
load worked in. If the car's inside temp is close to the 72 mark the AC will not be as cold even if the outside ambient is 80-90.


Have to agree with Scott here, I know for a FACT that in the auto climate control system, the temperature setting does affect the position of the door which blocks off the heater core. At any setting above 65 (maybe even anything above 60) degrees, there's going to be some degree of opening of that door.

Jeff's car has manual A/C. When the temp lever is at anything less than full cold, the door will be at least partially open to allow some air to be warmed by passing over the heater core.