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I've been checking for a while, haven't found anything that works. 1997 Tahoe, 5.7, 4x4, 4 door. When you change the temperature on the dash, you feel a slight increase in temperature, not nearly what should happen. Checked heater hoses, both hoses, both before and after the valve, are all 180...

I'm very afraid of what this sound is ... Is there a way to attach a sound file? It started out as a "random" noise, sort of a clunk, and then it was only on slowing down after revving. Within 15 minutes, it became an all the time noise. Seems loudest at the right rear of the engine, but you...