Fan blowing at max

[alphaod]

I usually leave my Mac Pro on 24/7 and I went on a trip a few weeks ago. Sometimes during my trip my Mac Pro crashed. I got home yesterday to find the fans blowing at maximum speed. I've tried a SMC reset that didn't do anything.

I'm thinking a thermal sensor is broken, but iStat doesn't list anything as over temp… I'm wondering what I can do at this point, and it's just out of AppleCare by a few months (though a lot of parts where replaced the week before AppleCare ran out).

 

[justperry]

Is there no 3 months warranty on repairs?
Never heard of that this is the case, what I would do is call Apple and mention it was repaired a while ago and you have problems again, they might solve it for free.

 

[666sheep]

Run ASD and see what it will tell.

 

[wonderspark]

Have you given the insides a good cleaning lately? I've heard of dust balls shorting things out inside, if it's been a really long time since you've gone in and cleaned. Perhaps a loose connection here or there as well, but I gather it was untouched while you were gone, so maybe not.

I'd also do the PRAM reset, not just the SMC. I have had full fan syndrome once myself, and I did the PRAM and SMC resets together, so I don't know which fixed it, but it returned to normal after and ever since.

 

[alphaod]

Update on this.

I tore the entire computer apart.

Cleaned everything, rid of all dust and debris. It's not having any more issues.

 

[GGJstudios]

Cleaned everything, rid of all dust and debris. It's not having any more issues.

I'm glad you got it resolved!

Have you given the insides a good cleaning lately?

Good call.

I'd also do the PRAM reset, not just the SMC. I have had full fan syndrome once myself, and I did the PRAM and SMC resets together, so I don't know which fixed it, but it returned to normal after and ever since.

NVRAM has nothing to do with fan issues. Resetting it will not help. Only resetting the SMC addresses such issues.

About NVRAM and PRAM​