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chargeing at idle (750 rpm vs. 1500-200 rpm

joeynenj on Wed July 02, 2008 1:55 PM User is offline

Year: 2001
Make: subaru
Model: outback
Engine Size: 2.5
Refrigerant Type: 134a
Ambient Temp: 80
Pressure Low: 30
Pressure High: 210
Country of Origin: United States

hello, i just got my guages and im getting readings of 30 low and 210 high AT IDLE (750 rpm) , and the 1500-2000 rpm range where im getting 25 low and 250-260 high. tests were done at 80 F, ac on high, do i apply the charging pressure/ambient temp chart to 750rpm IDLE SPEED or using the higher 1500-2000rpm range? The system seems to cool fine and there are no moaning cow noises from the accumulator anymore. thanks for any input!

Chick on Thu July 03, 2008 8:07 AM User is offlineView users profile

You have a sight glass on that car don't you? If so, check for bubbles, if it's cooling you may be just a tad undercharged, or right on the money in which case "if it ain't broke don't fix it"... Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

joeynenj on Thu July 03, 2008 6:14 PM User is offline

hi, No i dont believe i have a sight glass on this car :-( wish i did!

Chick on Thu July 03, 2008 6:25 PM User is offlineView users profile

subarus usually do, but in any case, if it's cooling fine, check the cooling fans for proper operation, clean condenser, area between radiator and condenser. The only other way to properly check the charge, provided no added refrigerant, would be to recover and weigh in the factory charge. If the car has been serviced, you really don't know what they put in it...But if it ain't broke, don't fix it... Hope this helps..

Pressures help with diagnosing problems but are not the best to determine full charge..

Also, feel the suction line, should be cold all the way to the compressor, that is a better indication of full charge. Inlet and outlet of the evap should be the same temp, oulet slightly colder...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Edited: Thu July 03, 2008 at 6:27 PM by Chick

joeynenj on Fri July 04, 2008 5:33 AM User is offline

hi, ok the condensor is clean, rad is clean, fans are spinning fine, flow is good,condensor feels about the same on both end to the touch and return line to the compressor is cold and bulding condensation. You said u believe Subarus have a sight glass? please tell me where, i dont see one. Thanx again

Chick on Fri July 04, 2008 6:14 AM User is offlineView users profile

Not sure on that one, but I'd look on the top of the drier, it's possible it doesn't, always hard to tell when you're a few states away from the car.... And remember, we work on different cars, and models of those cars, every day, so you could be right.. I just remember all the subarus I worked on had one on the passenger side, rear near the firewall on the drier..Yours may not...Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

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