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High pressure on both sides

dwole on Sun June 03, 2012 10:36 AM User is offline

Year: 2005
Make: Toyota
Model: Sienna
Engine Size: 6
Refrigerant Type: r134a
Ambient Temp: 85
Pressure Low: 200
Pressure High: 400+
Country of Origin: United States

I need some second opinions on this one

I am working on a 2005 Toyota sienna le; here is what it is doing:

1) no cold air (sort of, sometimes it can get cold on the passenger side only)
2) both gauges, low and high are off the charts (so much so, that it is blowing the pressure relieve valve on the compressor to release pressure. The gauges have readings in excess of 400lbs on high and also very high on the low side)
3)compressor cycles on and off continually, no time between cycles just on then off, until it blows pressure release.
4) this is not an overcharge, I have purged the system and evacuated 3 times. The pressure will build as I refill the system, and at about .2 grams it starts going nuts (with high pressure on both sides), As I try to fill toward 780 grams recommended on the sticker.

I have replaced the expansion valve, dryer element, and flushed in between with flush solution (also pushed dry air for 45min after flush). Nothing has helped. Could this be a compressor problem? Or could it be the rear expansion valve is stuck and causing this problem? Any ideas are welcome.
Kind regards,

mk378 on Sun June 03, 2012 10:56 AM User is offline

This is a condenser issue, either fans are not working or it is clogged internally. Compressor is working great to make 400+ psi.

dwole on Sun June 03, 2012 11:38 PM User is offline

Thanks mk378,
Gonna replace this weekend (hopefully) let you know what happens

dwole on Sun June 10, 2012 1:14 PM User is offline

dwole on Sun June 10, 2012 1:16 PM User is offline

Ok, Replaced the condenser. Still have the problem. I noticed that the cooling fans on the radiator are not coming on. They do come on at times, but it doesn't look like they are on when the ac is on. Could this be the problem?

mk378 on Sun June 10, 2012 2:16 PM User is offline

On some cars the fans are set up to trip on high side pressure (over 200 or 250 psi), on others they simply come on whenever the compressor is on. You absolutely need the fans to run a lot for the A/C to work with the car sitting still.

Edited: Sun June 10, 2012 at 2:17 PM by mk378

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