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Old 06-11-2012, 08:49 PM
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Join Date: Aug 2006
Location: Houston, TX
Posts: 450
92 S320 R134 Temp Charts

Does anyone have a set of temp/pressure charts for R134?

We just finished the dreaded evaporator replacement task. Replaced expansion valve and dryer at the same time.

Pulled good vacuum for 2 or so hours. Left system closed for 24 hours - held vacuum without issue.

Added about 35-40cc of oil during recharge, per AllData instructions. Recharged about 2.65# of R134. No bubbles (or almost none) at site glass.

Lo pressure around 52-53, high about 250-260 in a 95f, 65%rh garage. Center vent temps around 55f - I would think the system should do better than that.

Compressor is original unit @ 155k miles.

This is with the hood up, and 105f air going into the system at the cowl. I would expect some gain with the hood closed, but not a lot.

I think the pressures are in line with the environment we were working in - I just want to make sure.


W. Brian Fogarty

'02 S55 AMG (W220)
'92 300SE (W140) - sold
'76 450SEL 6.9 Euro #1164
'76 450SEL 6.9 Euro #521

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