I posted this problem on another forum and got helpful ideas but nothing will fix it..so far.
In the heat of the day, at 100 degrees plus, the A/C system will shut down for about 20min out of every hour. Before you think that the high pressure switch is shutting it off, I've had a set of gauges hooked up for the last 4 days and when it's working, H/S has never been over 275...Low is down to around 25. It's not "freezing up" as the evaporator is clean and I don't run the thermostate more than 80% cold and run the blower on high and moving LOT'S of air. I washed the condensor, Hydraulic oil cooler and radiator so they are clean. Combine will not heat even in these temperatures. Freon level is adaquate according to a A/C mechanic that I had out to look at it 2 days ago. I replaced the $300 "air conditioning control module" (A/C system brain box) and that hasn't fixed the problem.
Ambient tremps of 100 and below and the system works fine. It's just in these hot afternoons that it fails and is really needed.
Might mention and I wouldn't think it would have anything to do with it but today on a 20 minute plus shutdown, had a bin full and was heading for the truck...shut the header off first and when I shut the separator off, at that very moment, it started to cool. If this is any indication of a problem, make me wonder if I don't have an electrical problem. Somtimes after it been cooling nicely, and you idle back to talk to the truck driver or someone, the system will shut down, but speed the engine back up and it's back to cooling.....like I'm short of voltage somewhere.
Any ideas?
Sorry for rambling on but this problem is not acceptable in my books, especially when it's hot....thats what A/C is for.
In the heat of the day, at 100 degrees plus, the A/C system will shut down for about 20min out of every hour. Before you think that the high pressure switch is shutting it off, I've had a set of gauges hooked up for the last 4 days and when it's working, H/S has never been over 275...Low is down to around 25. It's not "freezing up" as the evaporator is clean and I don't run the thermostate more than 80% cold and run the blower on high and moving LOT'S of air. I washed the condensor, Hydraulic oil cooler and radiator so they are clean. Combine will not heat even in these temperatures. Freon level is adaquate according to a A/C mechanic that I had out to look at it 2 days ago. I replaced the $300 "air conditioning control module" (A/C system brain box) and that hasn't fixed the problem.
Ambient tremps of 100 and below and the system works fine. It's just in these hot afternoons that it fails and is really needed.
Might mention and I wouldn't think it would have anything to do with it but today on a 20 minute plus shutdown, had a bin full and was heading for the truck...shut the header off first and when I shut the separator off, at that very moment, it started to cool. If this is any indication of a problem, make me wonder if I don't have an electrical problem. Somtimes after it been cooling nicely, and you idle back to talk to the truck driver or someone, the system will shut down, but speed the engine back up and it's back to cooling.....like I'm short of voltage somewhere.
Any ideas?
Sorry for rambling on but this problem is not acceptable in my books, especially when it's hot....thats what A/C is for.