Re: John Deere Air Conditioning

Posted by G/MAN on August 06, 2007 at 07:39:49 from (67.52.48.10):

In Reply to: Re: John Deere Air Conditioning posted by Magon on August 05, 2007 at 11:15:44:

Gauges and pressure checks will tell the tale - the expansion valve could be stuck open or closed and affect the pressures accordingly. Another distinct possibility is that the compressor isn't engaging - is the thermal fuse good if there is one? Is the thermostatic switch sending current to the compressor clutch? Dyed refrigerant will pinpoint leaks in the future. Best way to make sure it's leak-free now is to pressurize the system with 250 psi of dry nitrogen and let it sit overnight. If it holds pressure, it's leak free. If you have to go after the expansion valve, be very careful, because the fittings tend to corrode over time and it's easy to damage the evaporator. The small sensing line is the worst, and Deere makes a weld-on replacement fitting that a competent aluminum welder can install if the threads come off the old one. As Bob said, there will still be bubbles in a properly charged R-134a system, so if it has been converted, make a note of that. You might also want to check the operation of the heater control valve - if there is hot coolant circulating through the heater core at all times, the A/C will never work properly. And if you open the system, be sure to replace the receiver-drier and evacuate the system with a vacuum pump for at least an hour or so before recharging, and making sure it holds a good vacuum is another good leak check. If the system is still R-12, refrigerant capacity is around 4.5 pounds. If it has been converted, you want about 80% of that, or around 3.5 lbs. Charge with a good scale - don't guess.

Replies:

• Re: John Deere Air Conditioning Magon 09:16:23 08/12/07 (0)
• Re: John Deere Air Conditioning Magon 18:11:07 08/08/07 (0)

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