90 AC with Parallel flow condenser and R12 - ZR-1 Net Registry Forums

-=Jeff=- · 06-27-2012

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=- · 06-27-2012

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

scottfab · 06-27-2012

Quote:

Originally Posted by -=Jeff=-

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

Isn't that kinda expensive using R12 still?

-=Jeff=- · 06-27-2012

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 · 06-27-2012

Quote:

Originally Posted by -=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

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=- · 06-27-2012

Quote:

Originally Posted by cvette98pacecar

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?

Quote:

Originally Posted by cvette98pacecar

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 · 06-27-2012

Quote:

Originally Posted by -=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

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=- · 06-27-2012

Quote:

Originally Posted by scottfab

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 · 06-27-2012

Quote:

Originally Posted by -=Jeff=-

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...00_or_more_cp/

Mystic ZR-1 · 06-27-2012

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...)

06-27-2012	#1
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,150	90 AC with Parallel flow condenser and R12 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 __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

06-27-2012	#2
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,150	Re: 90 AC with Parallel flow condenser and R12 I should add, the Evaporator looks clean and clear as well __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

06-27-2012	#4
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,150	Re: 90 AC with Parallel flow condenser and R12 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 __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

06-27-2012	#10
Mystic ZR-1 Join Date: Jan 2010 Location: Mystic CT Posts: 2,616	Re: 90 AC with Parallel flow condenser and R12 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...)