ac heater ploblem

I'll need some more information in order to more accurately asses your vehicle's issue. 1. Regarding the A/C: Does the compressor cycle regardless of whether the A/C is actually turned on or not? Does any air come out of the vents at all? If so, is the air hot? *NOTE* The idle increase is normal, as it is supposed to increase when you turn on the A/C to keep the compressor from bogging down the motor. The heater and defrost are causing a similar respoonse, but in their case it is due to the additional load on the alternator when those higher-draw circuits kick on. 2. The wavering engine idle/rumble strip noise may be indicative of one (likely several) broken engine/transmission mounts, which may be allowing the intake manifold to vibrate against the firewall under certain circumstances. Please check the condition of your mounts and let me know what you find, and we'll go from there.