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Showing results for tags 'cooling system'.
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2005 tahoe P0480 help
Troy272 posted a topic in 1999-2013 Silverado & Sierra 1500I 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
Unusual Cooling System Problem
Jim Foley posted a topic in 1999-2013 Silverado & Sierra 1500I have a cooling system problem that I cannot seem to find a cure for. This is in a 2004 Chevy Silverado 5.3 Vortec model 1500. Truck was overheating, I replaced the thermostat. It has a closed system, no radiator cap, so I went online to see how to properly “burp” the system. Once finished, it came up to normal temperature for this truck at idle and at normal driving speeds. I took it for a drive. It held the normal temperature until I stopped. Once I stopped the temperature dropped dramatically and instantly from 210F to 185F. I thought perhaps I missed something when I burped it and so I burped it once again, but there was no more air to be bled from the system. I have owned this truck since new in 2004. The temp has always run at 210F as a normal temperature. Once it comes up to operating temperature is never changes unless it is really hot outside and I am running the AC. I checked the radiator, no bugs or deformed fins, no leaks. I checked the water pump, no leaks and no noise, no play in the shaft bearing. Also checked the fan clutch, it seems ok. Also there was no foreign matter in the coolant when I drained it. No collapsed hoses, they seem to be in good shape and no leaks. No water in the oil, or oil in the coolant. The part than seems so strange is how the temperature changes so fast; it is almost instant once I come to a stop. There is no way that the actual coolant could change temperature this fast, it is instant. After continued driving the temperature will alternate between 210F and 185F intermittently as I continue driving. I am at a loss to figure out what is wrong, even though it is not overheating, something has obviously changed. Is there anything else I can check that might cause something like this?