Just finished up replacing the water pump on my '07 G35 Journey. Filled the system with coolant and started her up. Started first try and all sounds normal. While I was topping it off as it let out air the idle wasn't coming down. It's staying between 1400 - 1700 rpm. Temp came up to middle pretty quickly, but this has been the case with this car since I bought it 4 years ago. I'm thinking an air leak, but so far can't find any. I'm pretty sure all hoses are connected, but it's certainly possible I missed one. Any other ideas for me to look for?
Also, the coolant started coming out of the fill neck. I believe this is due to the t-stat not being opened yet (I didn't give it that much time).