I have a 6603 that I am having issue with the a/c. Tractor has 12xx hours
I bought the tractor used (auction) and the previous owne, said they had changed the expansion valve and dryer, but did not know of any other service to the a/c system.
The tractor cools very good at idle, but at higher rpm the system freezes up. I suspected the system to either have air flow issues or be low on refrigerant, but the filters, condenser and evaporator were clean. I hooked gauges up, and to get the low pressure up to anything higher than 20 the high side was 400+ and climbing.
I am certianly not an a/c expert, but it doesn't follow what I have seen in the past. Could it be an issue where too much oil is in the system causing the high side pressures to run too high.
Also was using the tractor yesterday, and the outside temp was 45*. I got a little warm in the cab so I turned the heat all the way down, and the just ran the fan thinking the fan would blow cool air from outside, but with the temp turned all the way down, and the fan on (no a/c) the vents were blowing warm air. I could turn the heat up and the it got hotter, but it never blew cool air as I would have expected given the outside temp.
I am wondering if I have a couple issues.
Thanks for any help you may have to offer.
Patrick
I bought the tractor used (auction) and the previous owne, said they had changed the expansion valve and dryer, but did not know of any other service to the a/c system.
The tractor cools very good at idle, but at higher rpm the system freezes up. I suspected the system to either have air flow issues or be low on refrigerant, but the filters, condenser and evaporator were clean. I hooked gauges up, and to get the low pressure up to anything higher than 20 the high side was 400+ and climbing.
I am certianly not an a/c expert, but it doesn't follow what I have seen in the past. Could it be an issue where too much oil is in the system causing the high side pressures to run too high.
Also was using the tractor yesterday, and the outside temp was 45*. I got a little warm in the cab so I turned the heat all the way down, and the just ran the fan thinking the fan would blow cool air from outside, but with the temp turned all the way down, and the fan on (no a/c) the vents were blowing warm air. I could turn the heat up and the it got hotter, but it never blew cool air as I would have expected given the outside temp.
I am wondering if I have a couple issues.
Thanks for any help you may have to offer.
Patrick