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Old 06-22-2007, 05:48 PM
Registered User
Join Date: May 2003
Location: Atlanta
Posts: 398
How cold is your R134?

I just did the core job on my 95 E320, had it recharged, and I'm getting about 50-52 degrees F at the vents. I tested my E420 which had the core done a couple years ago and it too is right there at the 50-52 degree F mark. Is that normal? not cold enough? what are you getting with your R134?

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Old 06-22-2007, 06:07 PM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,574
50-52 degree vents temps in Hotlanta during the that's not too cool.

My MBs R-12 cools down between 38-42 degrees at the vents when working.

My '04 Tacoma is equipped with 134A and it freezes me out.

I'd say your system needs work.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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Old 06-22-2007, 06:10 PM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
possible that the fresh air doors are not closing in both cars.
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Old 06-22-2007, 07:00 PM
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Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,632
are testing it at speed? i would say the car needs to be running at 1500-2000 rpms to get a fair reading... at idle in the city...50 probably isnt bad.
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k

1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it

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Old 06-22-2007, 08:13 PM
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Join Date: May 2003
Location: Atlanta
Posts: 398
yeah it was at idle.

everything is new in the 320, new core, new drier, even new cabin filters and blower motor.

I'm going to take a digital thermo with me tomorrow and drive around.
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Old 06-22-2007, 08:24 PM
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Join Date: May 2007
Location: Arizona
Posts: 757
I'm getting a steady 40F at speed and about 50-55F in stop-and-go traffic at 109 F outside today. Other than when I parked my car for a few minutes and restarted it, I have not seen coolant temps above 100C. The CoolHarness works great.
1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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Old 06-22-2007, 08:32 PM
just-n-time's Avatar
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Join Date: Feb 2006
Location: Louisiana266 Maloy Rd winnfield71483
Posts: 804
I use freeze12 and get 40 when the climatic wheel is set at 65 in the drive way. It gets cold enough that the heat cycles.
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Old 06-23-2007, 12:37 AM
wscheffer's Avatar
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Join Date: Jun 2007
Location: Ohio
Posts: 108
Thumbs up Cool 42

I get a steady 42 F. with revs at 1500 to 2000 running R-134a. Just put in a new evaporator, expansion valve and dehydrator.

Not bad for a 20 year old car though!
1987 420 SEL - Like a fine wine only better with age
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Old 06-23-2007, 04:34 PM
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Join Date: Mar 2007
Location: Houston, Texas
Posts: 211
Mine gets around 45 or so. 1987 560SL - 134 system, new drier, schrader valves and a prayer for nothing else!
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Old 06-23-2007, 05:35 PM
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Join Date: May 2006
Location: Atlanta, GA
Posts: 293
I get 42 Degrees F in my 560SL and 300D on a 95 degrees F day. This is at a normal driving speed. I have actually been quite satisfied with my 134a conversions on Mercedes. My BMW didn't fare so well!

All the best,

J. P. Mose
1968 250SL
1970 280SE 3.5 Cabrio
1987 560SL
1990 560SEL
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