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95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

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Old 05-23-2005, 03:54 PM   #1
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'99 AC High side-low side pressures

Whoooeee it's hot here folks...Over 100F for three or four days now. The AC on the '99 hasn't been all that cool, so I added a can of R134 which brought the low-side pressure to 44 lbs (checked using one of those cheapo AC pressure testers).

Temperature in the vent is 48F. Wondering if the low side pressure is too high now. Gonna run out and get a more accurate Hi-Lo guage set up and recheck.

Just wondering what the high-side, low side pressures are supposed to be.
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'99 4Runner SR5 4WD, 5-SPEED. Still stock. It's my very cold weather and field vehicle. Michelin tires and synthetic fluids get me 20-22 mpg. 170K miles.

'02 BMW R1150RT. Makes everyone jealous when I pull up for gas. Awesome bike. Next one is a GS. Sorry Toyota.

'95 4Runner LIMITED 4WD, 5-SPEED, over a quarter million miles on the original 3vze.
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Old 05-23-2005, 04:38 PM   #2
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check out http://www.autoacforum.com/ and http://www.aircondition.com/wwwboard/ I don't know much about 134a but 44psi sounds a little high to me.
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Old 05-23-2005, 04:56 PM   #3
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i thought it was supposed to be around 20-25psi
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Old 05-23-2005, 06:38 PM   #4
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According to this pressure-temp chart, at today's temp of 102, the pressure on the low side was within specs of the chart.

Pressure-Temp Chart
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'99 4Runner SR5 4WD, 5-SPEED. Still stock. It's my very cold weather and field vehicle. Michelin tires and synthetic fluids get me 20-22 mpg. 170K miles.

'02 BMW R1150RT. Makes everyone jealous when I pull up for gas. Awesome bike. Next one is a GS. Sorry Toyota.

'95 4Runner LIMITED 4WD, 5-SPEED, over a quarter million miles on the original 3vze.
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Old 05-24-2005, 05:50 PM   #5
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Got the pressures from the AC forum...Great guys, lots of help.

"Pressures list out the same for both vehicles.

Low Side: 21-36 PSI
High Side: 199-228 PSI

Refrigerant Capacity:

1995: 23.2-26.7 ounces of R134a
1999: 21.2-24.7 ounces of R134a

Pressures listed were with an ambient of 86 to 95 degrees."
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'99 4Runner SR5 4WD, 5-SPEED. Still stock. It's my very cold weather and field vehicle. Michelin tires and synthetic fluids get me 20-22 mpg. 170K miles.

'02 BMW R1150RT. Makes everyone jealous when I pull up for gas. Awesome bike. Next one is a GS. Sorry Toyota.

'95 4Runner LIMITED 4WD, 5-SPEED, over a quarter million miles on the original 3vze.
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Old 05-24-2005, 05:50 PM
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