I own a 2002 Chevy trailblazer LT which is housed at my home in Aruba in the Caribbean. The weather here is generally in the high 80s during the day. Today is the first day it has rained in 3 weeks. I just picked up my SUV which had a new water pump installed. While driving home, I put on the AC and noticed vapor (although at first I thought it was smoke but it did not smell like smoke) coming out of the AC vents inside the SUV. I got home and opened the hood and everything looked normal. Should I be worried?

You might have a bad heater core. What did you originally take the vehicle in for?

You might have a bad heater core. What did you originally take the vehicle in for?


I took my SUV in for a new water pump. The vehicle had been run by the garage for sometime to check for leaks, make sure thermostat was working, etc. When I turned off the AC, the vapor stopped coming out of the AC vents.

Was the water pump leaking/noisy? What reason did it need to be replaced? Were you having an overheating issue?

Was the water pump leaking/noisy? What reason did it need to be replaced? Were you having an overheating issue?


The water pump was leaking and rusting out. It also caused a clicking sound. I have no idea but I would imagine since the water pump was leaking, the car would overheat. I just ran the car for 6 minutes or so, turned on the AC and nothing happened.

The vapor you saw was conditioned air mixed with humid air. The same as when you open your freezer at home.
Using recirculate will diminish the vapor.

The vapor you saw was conditioned air mixed with humid air. The exact same as when you open your freezer at home.
Using recirculate will diminish the vapor.

Yes, I agree with your comments,