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Hi, The AC of my 02 mercury mountaineer started malfunction from last winter, first it was blowing cold air in winter then warm/hot air in summer. I gather that's basically ambient air that haven't pass through either compressor or heat core, and the blend door is most likely at fault. I have...

Found it: Coolant leak - what is this thing for? Need some help, 3 Separate Issues! ( Photos ) Part #: #1L2Z-18599-BA, Heater hose angle adapter

Hi, Does anyone know the name or part # of the circled coolant hose connector in attached image? My truck seems to be leaking coolant from the circled area. I am thinking of replacing either that connector the whole hose, but couldn't find any parts with matching images on rockauto. Thanks.

Well, not strictly good news to me either. I actually kind of miss the whistle noise. Because it was so consistent, I relied on it as over speeding alarm, but now it is gone. That is how I noticed it. Apparently I was driving very fast, but that little whistle didn't come up. LOL

It has been a while since I posted the question. I'd like give it an update. The truck died on me once in a parking lot, after a little research I decided to replace idle air control valve. So I fixed the problem, got better idle too. The unexpected consequence is, the whistle like noise at...

Thanks for replying. But I am quite sure it is speed dependent. The speed has to be higher than 72-75. If it is lower than 70, there will never be that whistling noise. I tried quite a few times, if I slow down to just below 70MPH, then the noise will go away. Also if I turn off AC, the same...

Hi, I have been reading posts from this forum quite a bit before and after I acquired my 02 mountaineer awd v8. So thanks goes to everyone first. Lately I noticed some sort of whistle like noise when I am driving at high speed (75MPH +), this usually happens during a hot sunny day...