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What are good vent temps?

pwilkinson on Wed September 14, 2011 1:15 PM User is offline

Year: 97
Make: jeep
Model: wrangler
Engine Size: 2.5L
Refrigerant Type: R134A
Ambient Temp: 90
Pressure Low: 27
Pressure High: 190
Country of Origin: United States

I have posted a couple of times lately. I have my AC working alot better than it was. What are some good vent temps. In traffic Max AC I'm sitting on about 56 degrees. Start driving temp drops to about 52 degrees. Compressor doesn't cycle off unless I slow the blower down. If I slow the fan speed down to the next level it will drop to 46-48. I don't have the original specs for this system. When I vacuumed the system and charged it I used 24 oz of R134a minus whatever I lost in my gauges.

Cussboy on Wed September 14, 2011 4:10 PM User is offline

Faster fan speeds will always result in higher temperature readings (less time to exchange the heat). Temperatures while driving will generally also be lower than idleing, due to higher rpm and more air flow over the condenser, especially if your fan or fan clutch is less than optimal condition.

pwilkinson on Wed September 14, 2011 4:57 PM User is offline

I knew I would have higher temps at faster blower speeds. That part is common sense. I was hoping to get in the upper 40's at idle and low 40's on the road. I don't have any specs for this AC system. I have great airflow across the condenser. I replaced the stock mechanical fan with a electric fan from a Crown Vic. It's pulling alot more air than the stock clutch fan. I can't touch the condenser on the inlet. On the outlet it is warm but not uncomfortable.

TRB on Wed September 14, 2011 8:54 PM User is offlineView users profile

Is this a factory system or after market. If aftermarket which manufacutre?

Hard top, soft top or no top?


When considering your next auto A/C purchase, please consider the site that supports you:

pwilkinson on Wed September 14, 2011 9:42 PM User is offline

It's an aftermarket system made by Clardy MFG. It was in the jeep when I bought it. It is very similar to the kit sold by AMA. I bought a replacement compressor from AMA about 4 years ago and never could get it below 60 on 90 degree days. About a week ago I broke the system down flushed all the lines replaced the expansion valve and drier. I pulled a good vacuum for an hour. It will now get down to 56 at idle on max ac. It drops to the upper 40's on the highway. Also I have hard top, but it doesn't offer much insulation. No carpet either so the floor boards are kind of hot.

Turbofiat on Sun February 12, 2012 9:28 AM User is offline

Last summer I tested a few of my vehicles. All around 95F ambient.

1980 Fiat Spider with custom A/C system I built. This is a recirculating under the dash system. I get about 45F while the car is moving. If the car sits idling for about a minute the temperature will increase to around 50F.

My 2003 Subaru Legacy Baja runs around 45F on recirc mode and 55F pulling air from the outside. Not a whole lot of difference between it and my Spider except my Soobie is better insulated and the fan blows more air.
My 2008 Mustang GT will run around 45F pulling air from the outside and as low as 35F on recirc mode. BBBRRR!!

Dad's 98 full size Chevy can will freeze you too death on maximum A/C. I haven't checked it but I'd say it's close to the Mustang.

Always said when it comes to building A/C systems for cars, the Americans have it all figured out. Even Dad's previous BMWs could not compare to the A/C of a Ford or Chevy.

Edited: Sun February 12, 2012 at 9:32 AM by Turbofiat

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