conditioning

We had a couple of warmer days and I noticed my A/C was working intermittently. It works at idle, but any rpm up to 2K and it will start cycling on and off every 5-7sec. At 2k it will stay running longer up to 2 min before it cycles as long as the fan is on high and the A/C is set to max. I...

Been reading up on this and none of the solutions seem to fit my problem. '99 F350, 7.3, crew cab, long bed, 299510 mi On very cold mornings the heater works fine for about 15 minutes. After everything gets warm the air flow slowly slows until I stop getting air movement from the vents. I...