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Showing results for tags 'cooling system'.
I have a 2005 Tahoe 5.3 with 248,000 miles. On Monday morning I noticed that the cooling fan was running even though I hadn’t started the truck yet. Since then, the cooling fan will run after I turn the vehicle off. What’s odd is sometimes it won’t do it until an hour or 2 after it’s been off. Also my temperature gauge is fine, no overheating. I did a code scan and P0480 comes up. I replaced the relay for cooling fan 1 and no change. I decided to disconnect the battery, cleaned the 2 huge harnesses that go to the PCM, and cleaned the connectors to the fan control fuse block (not sure if that’s the correct term sorry). I even removed and cleaned the connectors to the cooling fans and still no change. Could it be a grounding issue? I think I found the ground connector (passenger side radiator support area) but will have to put the truck on ramps to get a better look and grip on it. I’m kind of lost at this point and was wondering if anyone could help.
So, I have a 2011 Sierra half ton, it’s overheating at idle in gear. In park it won’t. Soon as you start moving it cools off, the fans do turn on but they don’t seem to turn on fast enough. It’s already starting to overheat by the time the e fans kick on. Soon as you start moving, cools right off instantly. This tells me maybe sticky t stat? Maybe coolant temp sensor? What temp are the fans supposed to kick on? Thoughts...tia