I rode down to Everett today with my friend in his 1990 Prelude. We parked and left for a bit, around 10 minutes.

When we came back the car sounded like it was running. We could clearly hear it standing near it. The key was not in the ignition it was with him. When we popped the hood it sounded more like a/c blowing.

Once he put the key in and turned it forward for accessories the sound stopped.

Any ideas about what this is??

Thanks

 

radiator fan, I wouldn't worry about it unless it keeps running for more than 15 minutes after you shut the car off, although I would check coolant level

 

That was what he was thinking.

Thanks for the reassurance.

 

yup, theres even a sticker on the radiator cross piece up top that says it