Prius (Gen 3) :: Fan Noise During Morning Startup
Aug 30, 2010
I am experiencing a fan noise that precedes the ICE during morning startup. It sounds like a model airplane with a cheap, buzzy propeller. It is not the cabin blower and it comes from the front of the car. It goes for about 10sec and then the ICE fires up, drowning out the fan noise, which I presume fades out. And then I don't hear it again when the ICE shuts off. I also don't hear it at a stop light or subsequent restarts. Seemingly, it only does it after it has sat overnight.
It wasn't always like this. Nothing has changed in my routine. Build date Sep 09. 10000km.
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My G1 prius (2001) started making a grinding noise when I start it up in the morning. There are no warning lights (yet) and it drives fine, but that noise can't be good -- something will fail shortly. I've searched the internet quite thoroughly and there was one similar problem reported, which ended up being linked to the ABS pump. The noise seems to come from the inverter, or somewhere under the inverter. I took a video of it and posted it here.
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The weather this morning was around 51*F, so not too cold (to me).
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I guess my question is, is this something that could put my truck out of service if left untreated? I'm assuming it's not a spun bearing because the noise goes away, but is there a possibility coolant could be leaking into the case but stay the same level in the reservoir?
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Yesterday morning, my 2010 had a very strange noise happen at startup. I'll preface this by saying that it was very early in the morning and I wasn't quite 100% awake, so the exact chain of events are a little foggy to me.
It was about 65 degrees when I went to start the vehicle in the morning. I noticed it was pretty humid out and the first humid morning of the year (I live in central PA). When I hit the power button, a very loud noise came from the engine area. It sounded like metal grinding and the motor having difficulty idling. I depressed the brake to attempt to put the vehicle in drive and the yellow "!" indicator light came on with a message on the on board display (i cant remember what it said). I shut the vehicle down and after a few seconds hit the button again..... same thing. This time, the idling and "grinding-like" noise went away and then the car seemed 100% normal. I noticed there was a little bit of blue smoke coming out of the exhaust while it was idling/grinding roughly.
Perhaps not the smartest thing to do, but I left for work and the vehicle has worked 100% fine since the mishap yesterday morning. In total, I have driven about 150 miles since the issue with no problems.
I read a sticky post concerning a service bulletin for engine knocking at start-up but what i heard seemed to be more than knocking and it was well above 40 degrees.
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During a recent oil change, a hybrid technician claims that this is normal. It used to happen infrequently but now it is consistent, so if it was normal, I should have heard it when the car was new.
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I have checked whether it is radio by removing fuses 8 and 28 and have also switched off the heater fan, both without any effect.
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Twice during the 6 months that we have owned our 2010 Prius, a loud clattering noise from under the hood occurred upon startup. After shutting it down and restarting, all was normal. It sounded like an engine that was getting ready to throw a connecting rod. The dealer could find nothing wrong and when I contacted Toyota's hot line, they were clueless as well. One service writer suggested the ABS as the source, but I've owned 5 other cars with ABS and never heard anything like it.
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On startup my 2005 Prius standard produces a low level cyclic noise which sounds like a hacksaw. This noise lasts for several minutes and is not affected by putting the car in motion or leaving it parked. The noise seems to be coming from the Synergy Unit but who knows?
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So i have recently started hearing a noise coming from the rear of my car when i start it in the morning. When i fire my car up and sit in it for 10 maybe 20 seconds it starts making like a clunk/chug/thud/pumping sound? i fear its a sign that my fuel pump is going bad? After about another 30 seconds or so it goes away. It only happens when i fire it up in the morning probably because it has been sitting there for so long, but it won't do it lets say when i get out of work 8 hours later.
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There is a clunking sound coming from my passengers door (i have taken off the panel and looked for loose connections with no success everything looked good). My headliner/sunroof chatters.
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