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Originally Posted by whaaaaT
yea i dont think its the rush of cold air either. I think its got more to do with engine rpms and the coolant flow. I know when i stop at red lights my temp goes up a little right away. When i floor it in cold or go to a lower gear it drops a lot now. So im guessing this truck just doesnt do well job of controling its flow. Im sure sombodys gonna go crazy trying to defend the perfection of the hummer. But im not ranking on my own truck. Im just saying what it does. Its kinda wierd. I've never had any other trucks do this.
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This has come up a couple other times in threads. More flow doesn't necessarily mean drop in temperature. If the water is hot throughout the engine, it's just gonna flow more of the same temp water. I'd guess, because I'm too lazy to go check right now (and forget by the time I get off work every day) that the temp sensor is on the intake of the engine after the rad. Then, when the flow picks up, it's picking up the flow post radiator. If the temp sensor was in the out from the engine, it wouldn't change so much because the engine would keep the temp higher than flowing through the rad. Unless it was a really high-volume pump and pumped all the cool water from the rad through the engine to the sensor so quick it still looked like it was dropping fast, but from what I can remember (it is after all Friday and I'm at work, so my brain isn't working today), the temp drop is almost instantaneous, so that wouldn't make sense, would it???
I think I've confused myself now...