When you're filling the coolant, you should always have the temp setting on hot because there's a ball valve right in front of the firewall that opens allowing coolant to flow through the heater core. If it's on cold (closed) when you fill it, there could still be air trapped in the heater circuit. That's probably all it is, AICV's rarely go bad. If you keep throwing codes, give the AIC and your throttle body a thorough cleaning and it should go away. Those AIC motors are expensive as hell, and a code 14 is pretty generic. There are 6 things that can happen that will set it off...

1. Low coolant.
2. Clogged Throttle Body Bypass.
3. Clogged AIC ports.
4. IAT and AICV electrical connectors attached backwards.
5. Wrong throttle body gasket.
6. Intake manifold leak.

Notice that none of these things are actually a failure on the AICV's part, but that's the code that will pop up. Your ECU doesn't know better. The AIC has an operating range, and if it can't stabilize the idle within that range, it just blames the AIC even if something else is the cause. If you can discount all 6 of these things, then the 7th option is a bad AICV. But check all of these first before dropping $200 on a new one.

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