Noises in garage

[Sleepypete]

I have read on this forum about the "evaporation leak check" and I think there is something else in that it circulates the coolant so that if you restart your car it is warm(er)? Lots of interesting technology that's for sure.

I think there's 2 systems at work :

First is an exhaust heater system that uses a heat exchanger in the exhaust system to heat up the coolant faster when the engine is cold. When the engine is warm, the heat exchanger is bypassed. I think that's partly what you mean there

Second is a vacuum bottle which stores hot coolant for use later. Wiki for the Prius says US & Canada only so this might not be on my UK CT. Although it could explain the whirry noise when you get close to the car for the first time in a while - it could be taking the hot coolant out of the vacuum storage and warming the engine up a bit.

Dunno about the detail though. The "evaporation leak check" is probably working on either the vacuum bottle or the aircon.

[rehabmax]

You could make a Sci-fi movie with the sounds this car make in the garage at night. I have had the CT200h for 7 months and every night around 11PM it starts doing its nightly electronic musical. Usually i get home at 6PM so this doesn't begin for a good 5 hours after the car is off. I don't know if it some computer run through or hybrid battery thing. I would like to know what the car is doing up late at night when it should be asleep.

[jimmyc13]

Wow, never knew the car did this, nor have I witnessed it. Crazy that 4-5 hrs. after you shut the car down, it's really just taking a snooze and comes back to life by itself to do this! Kind of cool.

[bumski667]

speaking of noises... has anyone gotten a "cold start rattle" or a knock during start of engine?

I think i experienced this issue this morning. I started, and heard knocking, or what sounded like a fan spinning hitting something. As soon as I depressed the accelerator, it went away. Any ideas? I was going to take it to the dealer, but not sure if I can replicated it. First time happening this morning. 20k miles.

[CTDEMO]

It's alive......my CT also makes some strange noise (small motor running sound) at night........creepy.....