How cold is your A/C when idling? Pole. - Page 2 - PeachParts Mercedes-Benz Forum

2.5Turbo · #16 06-15-2008, 11:35 PM

Somewhat cold...still with R12. Was charged three years ago and I think it is starting to get low. Don't have any gauges so I can't check, but last time it was charged they put dye in it so the shop might be able to find where it's coming from. Fingers crossed it's not the evaporator!

JimmyL · #17 06-15-2008, 11:59 PM

All 3 W123's at idle for very long work up to 60 degrees with temps over 90. {was 101 today!}
That is R12, Freeze12 and R134a.
The W123 is just a limited system. My F-150 actually gets colder sitting and idling than it does driving. About 40 while driving, will drop to almost 32 when idling. I didn't even think that was possible.......

Alberta Luthier · #18 06-16-2008, 12:26 AM

but then I only wish they did a very few days a year here (western Canada). I'm thinking they are both gonna get ripped out and the space used for intercoolers eventually.

DeliveryValve · #19 06-16-2008, 12:46 AM

If the temps are over 100º F, I get around 50º F on the vents. Under 90º F and under I get around 38º to 42º F.

Quote:

Originally Posted by JimmyL

.....My F-150 actually gets colder sitting and idling than it does driving. About 40 while driving, will drop to almost 32 when idling. I didn't even think that was possible.......

I don't ever recall ever being inside a Ford with a crappy a/c. And it gets hot here!

JimmyL · #20 06-16-2008, 01:29 AM

Quote:

Originally Posted by DeliveryValve

If the temps are over 100º F, I get around 50º F on the vents. Under 90º F and under I get around 38º to 42º F.

What refrigerant are you running? {I can't remember}

DeliveryValve · #21 06-16-2008, 01:40 AM

Quote:

Originally Posted by JimmyL

What refrigerant are you running? {I can't remember}

I was running Freeze 12. But it bogged down my car. Now I am running R12 it is not bogging down the car but getting surprisingly the same performance. I am also running an ACkits parallel flow condenser with both of the refrigerants.

I think I need to tint my windows to improve performance or maybe clean out the evaporator to increase air flow to help when the higher outside temps hits.

JimmyL · #22 06-16-2008, 01:50 AM

Tinted windows help, but you are doing very well!!

Actros617 · #23 06-16-2008, 02:15 AM

Leaking frieon in "MY" 300SD so no A/C BUT in my Dad 300SDL its a freezing 31F in 90F R134a

DieselClack · #24 06-16-2008, 02:47 AM

I'm not real cold but cold enough running ES 12 in my 1983 300D. Ice cold when moving though and in 110F* temps!

pdrayton · #25 06-16-2008, 12:58 PM

The workshop book says the test to do is to rev at 1500 and open all windows and put ac on max. Then you look at the chart. A W123 gets about 50F with 85F ambient I believe.

Also, instead of R12, have a look at Enviro-safe R12 replacement. $6 a can on ebay. I'm going to try it in my 240D.

JimmyL · #26 06-16-2008, 01:10 PM

Quote:

Originally Posted by DieselClack

I'm not real cold but cold enough running ES 12 in my 1983 300D. Ice cold when moving though and in 110F* temps!

I've got 3 cans out in the garage that I purchased to put in China, which has the R134a. I think she is doing about as good as R134a can do. Yesterday it was 101 and moving I got down close to 50. That is about all R134a in a W123 can do at those temps.
I may try the Envirosafe and see what happens. If that doesn't work out, then it will be complete flush, rec/dryer and maybe an exp. valve and R12. I haven't wanted to go R12 based on need to flush and my compressor chirping.........
Envirosafe doesn't require installing into a vacuum as it doesn't create acid like other freons. That is just so weird to contemplate......

Matt L · #27 06-16-2008, 01:30 PM

Quote:

Originally Posted by JimmyL

Envirosafe doesn't require installing into a vacuum as it doesn't create acid like other freons. That is just so weird to contemplate......

I've read that claim, but have read about installers who do pull a full vacuum. Leaving noncompressibles in the system will raise your high-side pressure under the same conditions. Thus, your compressor works harder to do the same cooling, and you are not getting the full benefit of running a HC refrigerant. You might as well run 134a.

ES says that charging into only a partial vacuum helps prevent overcharging. However, you can prevent overcharging very easily into a full vacuum. In fact, you do it the same way that you would with Freon or Suva. You simply don't put too much in.

Anthony Cerami · #28 06-16-2008, 01:58 PM

34F idling in 99F ambient NJ TNPK traffic recirculate off and fan on medium, on 134a.
Thanks Lee!

dagObx · #29 06-16-2008, 02:12 PM

I'm lucky if I get down below 65*, whether running or at idle. At idle, there is little if any cooling. Using 134a & aux. fan is not running.

Burnzy · #30 06-16-2008, 02:20 PM

Unfortunately for me, my 20 minute drive home (stop and go............mostly stop) barely allows time for the interior of my car to cool down enough to notice. The few times I have been able to drive it for more than 10 minutes without stopping the AC seems to do OK. I am sure it would be better if the majority of the air wasn't blasting against my raging hot glass stove top/windshield.

View Poll Results: How Cold is your A/C when idling?
Not cold at all	10	23.81%
Somewhat cold	21	50.00%
Very cold	11	26.19%
Voters: 42. You may not vote on this poll