Broken fans ? Too high temperatures ?

My 6 years old Dell is slowing down a lot recently and the fans sometimes suddenly accelerate for a few minutes , so I tested with SpeedFan software and got these images/results.
Then I opened the computer to see all 3 fans turning seemingly normal.
Can you see any problem with my Fans or Temperature with these tests?
and how do I know which is Fan 1 , Fan 2 . Fan 3 ? and the same for the temperatures which is 1 , 2 , 3 ?
I saw one fan is in the power box , one is on top of the processor and one general for the case.
The Fan in the power supply seems the one that suddenly accelerates.
And when I opened it there was very little dust which I vacuumed and wiped the bottom.
Thanks for any answers.

Cheers

piazza2 said:

My 6 years old Dell is slowing down a lot recently and the fans sometimes suddenly accelerate for a few minutes , so I tested with SpeedFan software and got these images/results.

Click to expand...

After 6 years, I'd bet the thermal compound is showing signs of weakening. Dell loved to use a thermal 'pad' back in the day - not nearly as effective as something like AS5 or even a lower-end compound. If you're savvy enough to do so, consider re-applying.

piazza2 said:

Then I opened the computer to see all 3 fans turning seemingly normal.
Can you see any problem with my Fans or Temperature with these tests?
and how do I know which is Fan 1 , Fan 2 . Fan 3 ? and the same for the temperatures which is 1 , 2 , 3 ?

Click to expand...

For fans it's easy: with the case open and SpeedFan running, unplug one fan at a time and look to see what Fan# on SF drops to zero, you can then rename that fan in SF to correspond. For example, "Fan3" on mine was the front one - it's now "Intake"; "Fan2" was for the CPU - it's now "CPU".

For the temps, it's pretty much the same, though it's not as immediate. With the fan off and after the RPMs are at 0, watch to see what temp starts to increases at an accelerated rate. Then just rename as you did the Fans. It should go without saying, but you want to be very careful with how long your CPU HSF is off. In theory, it should be the quickest one to locate, as your CPU temp will jump up much quicker than the other temps, but be careful nonetheless.

piazza2 said:

And when I opened it there was very little dust which I vacuumed and wiped the bottom.

Click to expand...

I do hope your system was off and power cord removed when this happened...

89 temperature

But isn't that temperature of 89 excessive ? sometimes it goes to 93
Looks kind of high to me ,or maybe it's normal for that part.
What do you think ?

Speedfan is crap. Use something like HWMonitor or CoreTemp to monitor your temps.

I'd also replace the thermal compound with some fresh AS5.

Thanks for the advice , I'll do it tonight
But don't you think my temperatures are too high ?
That reading was under a light load when I turned it on
What are normal temperatures for those components ?

Like I said, Speedfan is junk. It's inaccurate so the temps you're seeing are useless.

CPU's should go no higher than about 76C and GPU's should go no higher than 79C.

Thanks voyagerfan99,
Very useful info , I'll go with the other 2 programs
and eventually I'll apply new as5 thermal if I need it