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Can't Recharge to Minimum 134 requirements

brcorp on Tue September 09, 2008 11:45 AM User is offline

Year: 1994
Make: Toyota
Model: Landcruiser
Engine Size: 6 Cyl
Refrigerant Type: 134
Ambient Temp: 90
Pressure Low: 40
Pressure High: 250
Country of Origin: United States

I just did a compressor / dryer replacement on my 1994 Toyota Landcruiser. The system calls for 1.76 min to 1.90 lbs of 134. Following a system evac, I attempted to put the 134 in, thought it quit taking it at about 1 lb. Air at duct is about 40 deg F, ambient temp was about 90 deg F. Hi pressure is about 250 psi and lo was 40 psi. Am I ok or is there a problem?

THANKS!

TRB on Tue September 09, 2008 3:46 PM User is offlineView users profile

Are you charging as a gas or liquid?

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brcorp on Tue September 09, 2008 3:57 PM User is offline

Can with valve up.

TRB on Tue September 09, 2008 4:48 PM User is offlineView users profile

Might try flipping it over to finish charging or heating the can with a heating pad.

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NickD on Tue September 09, 2008 5:36 PM User is offline

Can't say I ever had that problem, suction pressure is so low, not only wants to suck in the refrigerant, but the can as well.

First off, can't switch hoses until you get a can in, need that positive pressure so a tad of refrigerant leaks out rather than air leaking in.

Have to jury rig your hoses in such a manner, do this after drawing a normal vacuum, have the blue hose to the pump, yellow to a valved off can, red to high. With both manifold valves open, system will vacuum out plus clear out to the can. Let it run for awhile, then close off the low side to block the pump, open the valve can to get an initial charge into the high side. You can heat that can as hot as you want to, as long as the can valve is open, refrigerant will flow into the high side, the can should feel empty at this point.

Then close off the high side and get, put a new can in, purge the low side line and connect that for normal charging, when you snap on the blue hose, this time refrigerant is being released and air is not being sucked in. Start the engine, leave vehicle door open, AC on blower at max, and wedge the throttle to 2,000 rpm, this really drops the low side, then open the can and put the rest in. Toyota does publish the recommended pressures with variations in ambient and RH, I don't have those here for your vehicle.

Try this method and see what happens.

bearing01 on Tue September 09, 2008 9:26 PM User is offline

The last can goes in real slow. If you dunk the can of refrigerant into a bowl of hot water that will speed up the charging process by a significant amount. Keep your hand on the throttle and rpm's above 1500 to keep the suction pressure below 70psi. With the refrigerant in the hot water the can should then be somewhere around 90psi. That gives 20psi pressure feeding the system.

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