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Anything else I can do to improve cooling?

prof_chaos on Sat August 18, 2012 12:23 PM User is offline

Year: 1998
Make: Audi
Model: A6
Engine Size: 2.8
Refrigerant Type: R134a
Ambient Temp: 71
Pressure Low: 30
Pressure High: 200
Country of Origin: Germany

Well I have nice cold air after my recent repairs ...thanks for all the help so far. Now, I think it could be colder but I am not sure if there is anything else I can do. I tried my best to measure the charge I put in (using a digital scale) but I know I lost some refrigerant from the hoses, changing cans etc. Right now I'm getting about 55F from the vents on idle in 71F weather. Low side is 28-30, high side 180-200. Yesterday I went for a drive in 85F weather and got the vent down close to 50F.

On an Audi forum I've been advised that I am probably undercharged because low side pressure should be in the 50s.

What do you guys think of my pressure readings? Should I try adding a little more? Thanks!

previous thread on my repairs so far

mk378 on Sat August 18, 2012 12:48 PM User is offline

High side 200 at 71F, I wouldn't add much if any more.

Low side in the 50's would not be good. The ultimate temperature at the evaporator is limited by the boiling point, which rises with pressure, so you want to see it around 30 psi for best results.

Edited: Sat August 18, 2012 at 12:49 PM by mk378

prof_chaos on Sat August 18, 2012 3:27 PM User is offline

ok, so I must have some contamination in the system then?

Leggie on Sat August 18, 2012 4:14 PM User is offline

The evaporator load varies dramatically on humidity as well. 85F on a dry day in Seattle is different from 85F 80% in Florida.

Check the weather forecast in your area to get the approximate humidity.

prof_chaos on Sat August 18, 2012 4:28 PM User is offline

Well I thought it was humid today but Google says it's only 20%. I'm actually having trouble figuring out the ambient temp accurately though...a billboard outside the bank down the road says it's 82, Google says it's 85 and my car says it's 89. It feels more like 89 to me. I'm not getting below 60 from the vents today even when driving

Dougflas on Sat August 18, 2012 6:09 PM User is offline

You stated you're getting 30psi and 200psi. At what rpm at you at? You need to be at 1500rpm with high blower speed. Then give us the numbers after about 5 or 10 minutes.

prof_chaos on Sat August 18, 2012 6:16 PM User is offline

That was at idle, which is about 600-700 rpm on this car. I had the blower on halfway. I'll try to check at 1500rpm although I'm not sure how I can see both the gauges and the tachometer at the same time...I'll figure something out though

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