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Message: <blockquote data-quote="moots" data-source="post: 106983" data-attributes="member: 219">So tong,what fixe'd it?just to relate my experience.i also have this belt screeching sound,intermittently during initital start up during cranking but it quietens at idle.also when engine hot,when the viscous fan engages,the belt screeches,and whenever the a/c is s/w on at idle.if i rev it and s/w a/c on,it's ok.but sometimes it screeches on/off.so i was thinking it should be the a/c belt that's loose.NOT!last saturday,chk'd all belts and found the alternator belt was loose.tightened it up and voila no more noise.looks like the electrical load on the alternator when the a/c is engaged made it slip and screech.same during initial start up,and also when the extra load of the viscous coupling fan when it engages.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" /></blockquote>