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2006 GMC Sierra cooling fans question.
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Question
soulweeper
I have a 2006 GMC Sierra, 1500 2WD, 5.3L engine. I have 33,000 miles on it, for whatever it's worth. A couple weeks ago, I was going up a small hill in first or second, can't remember....and I noticed the temp go up a bit, which I'm sure is normal, but it wasn't that steep of a hill, and I wasn't on it very long, but it went back to normal when I got where I was going. Didn't think much of it, and it might do that every time I go uphill, but I don't remember it going much above normal since I bought it. I will say that I don't stare at my gauges every two minutes, but I'm pretty good at keeping a eye on them, so maybe I never noticed this going uphill before.
Anyway, it made me keep an eye on the water temp a little more than normal, just to be safe. I was going up another little hill a few days later...same thing. Again, didn't think much of it. The other day, I came home from work in the afternoon, after about an hour drive, truck at normal temperature, a 65 degree day....pulled in the driveway, truck was still running while I was writing down my mileage in my record book, and I noticed the temp go up just a bit. Nothing you call overheating, but going up above normal. So, I popped the hood, just to see if anything seemed weird, or coolant was low....anything. One thing I noticed was that my cooling fans weren't on.
Now, I'm not a mechanic, but I know some of the basics, but I'll admit I don't know exactly how the electric fans work. My last truck still had a fan that simply turned with the engine, and I bought this new, so I've just been driving it, not learning every aspect of it.
So, after a couple more minutes that day, the fans kicked on, and the temp came back down to normal. So....when are they supposed to come on, or not supposed to be on? The next morning, after I started the truck to go to work, I popped the hood right away, and they weren't on. I'm assuming that's normal, as the truck wasn't even up to normal temperature yet. My question is simply what can I look for to give me some idea if they're working properly? Are they thermostatically controlled or do they come on over a certain speed???
Any input would be greatly appreciated. Thanks in advance!
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