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  #1  
Old 05-07-2009, 06:24 PM
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How cold is your AC at idle?

Today I was stuck in alot of afternoon traffic and the vent temps were like 65 degrees. It was about 92 degrees outside, once moving the vents temps came down to about 45 degrees. So how is your AC at idle?

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

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  #2  
Old 05-07-2009, 06:44 PM
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Last I checked mine was at 90F ambient, with 38F at the vent while stopped and idling with the fan on mid-speed. That's with factory 134a. The high-side pressure went to 14 bar, then the auxiliary fan started and continued to run on low speed.
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  #3  
Old 05-07-2009, 06:49 PM
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what year car?
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #4  
Old 05-07-2009, 06:52 PM
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its always gonna like you describe at idle since no fresh air is coming in. Once you are driving it will go down
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1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)
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  #5  
Old 05-07-2009, 06:55 PM
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Quote:
Originally Posted by 79Mercy View Post
what year car?
Mine is a '96 W210.
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  #6  
Old 05-07-2009, 06:55 PM
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Quote:
Originally Posted by Oracle12345 View Post
its always gonna like you describe at idle since no fresh air is coming in. Once you are driving it will go down
Plenty of fresh air comes in with the blower. I had it at mid-scale.
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  #7  
Old 05-07-2009, 07:29 PM
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Quote:
Originally Posted by Matt L View Post
Mine is a '96 W210.
new cars don't count, most new cars come with that "freeze your a$$ off within 1 minute of being turned on" option.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #8  
Old 05-07-2009, 07:40 PM
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On an 80 degree day, it was about 50 at idle, but I wasn't idling for very long. I'll have to pay attention more. And that's with the ES in the '85 TD and the helpful input you gave me
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  #9  
Old 05-07-2009, 07:41 PM
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^^^glad I could help.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #10  
Old 05-07-2009, 07:41 PM
1986 300sdl 1985 380se
 
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Quote:
Originally Posted by 79Mercy View Post
Today I was stuck in alot of afternoon traffic and the vent temps were like 65 degrees. It was about 92 degrees outside, once moving the vents temps came down to about 45 degrees. So how is your AC at idle?
1986 300sdl. converted to 134A. 92 degrees outside today, 75% humidity.
At Idle 62 degrees. after 5 miles on the interstate at 60mph 46 degrees.

The coldest I have seen is early morning at 70 degrees outside, 90% humidity, 38 degrees.
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  #11  
Old 05-07-2009, 07:43 PM
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I have seen 35 at the vents before but it wasn't very hot outside, maybe 65 degrees.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #12  
Old 05-07-2009, 09:47 PM
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If you are running an old system converted to R134a you will see poor performance at idle - some use an oversized condensor and claim that helps.

If you are still running R12 and have poor performance at idle first clean the fins on your condensor out well and make sure the aux fan is functional. Then check the operating pressures to make sure the system is properly charged. If so you may have a partially clogged expansion valve - if you see high side pressures too high and low side too low. A properly working older system on R12 should run very cold at idle even in hot weather. If you are seeing temps much over 45* at the vents then something is amiss.
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  #13  
Old 05-07-2009, 09:52 PM
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Originally Posted by 79Mercy View Post
new cars don't count, most new cars come with that "freeze your a$$ off within 1 minute of being turned on" option.
New? It's 13 years old.
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  #14  
Old 05-08-2009, 06:36 AM
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Originally Posted by Matt L View Post
New? It's 13 years old.
"New" is a relative term on this board

You should see my family roll their eyes when I proclaim that something I own is "brand new" - like my HI-FI VCR
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  #15  
Old 05-08-2009, 09:15 AM
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Quote:
Originally Posted by nhdoc View Post
If you are running an old system converted to R134a you will see poor performance at idle - some use an oversized condensor and claim that helps.
I found that making the electric fans come on high speed on my car helped the idle AC temps by about 4* or so.

-Jason

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