Can anyone tell me what the rushing sound is after I shut the engine down? It doesn't seem that it happens everytime, just on random shutdowns. It sounds like a pulsing rush of air or liquid or something.

thanks,
daniel

 

I believe what you are hearing is the A/C system. Mine does it also.

MikeyB

 

Even when I haven't had the A/C on?

-daniel

 

turbo spooldown?

 

That would be my guess

 

I don't know. I would think that the turbo would just spool down and be done. This is a repeated rushing sound. It'll do it mayebe 5-10 times.

-daniel

 

My 1st gen does that after I put the BHAF on it. Sometimes it last for about 15-25 seconds.

 

I work in the HVAC field, and can tell you what you are hearing is your refrigerant equalizing in your cooling/heating system, even when you use the heat the refridgerant still cycles.

 

....would this be the case even if no heat/no AC was used? My fan wasn't even on?

-daniel

 

As has been said...turbo spooldown. It can also be heard from the exhaust pipe. Have someone turn off the truck while you stand at the exhaust outlet. Sounds good don't it?

 

I have not heard my turbo make a spool down noise yet.I do hear my a/c equalize often but have not noticed it doing so when not in use.Refrigerant will migrate to the coldest place in the system so it could be a freon noise even though its not been running.(20 years of burning fingers with -40 degrees).

 

5-10 times? That's not turbo spooldown.

 

Ok, today I listened specifically for it after driving the same road home from work, letting it sit & idle when in the garage for about 1 minute and then shutdown....and nothing....well, I heard the turbo spool down (yes, it is cool) but I didn't hear the repeated rushing again.. hmm?

-daniel

 

The A/C compressor will run when you call for defrost. The little A/C light on the dash won't be on but the A/C system is working just like it does on a hot day and you have the A/C on. The A/C runs during the defrost mode to pull moisture out of the air.

Maybe you were in defrost mode?

 

I'll have to check the dial, but I don't believe I even had the blower on. The other dial never moves in my truck. I think its always on the dot between Floor and 'defrost.' Maybe thats it. I like it up there because I don't like the air blowing on my face, but I didn't realize that setting caused the A/C to run or that it pulled moisture from the air. I thought it was just directing the blown air to another location.

thanks,
daniel