my trailblazer runs fine. just started to make noise, either fan clutch or waterpump bearings nothing is leaking thermostate was replaced no engine light on ? the noise sounds like a diesel and seems to fade at higher revs,how &what do i check first?????? please help
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2004 Chevrolet Trailblazer
Question: how do i tell if it's the clutch fan oe waterpump making noise ????
Answer #1raiderron June 21, 2011, 03:27Master
Would definitely help you if you had a mechanics stethoscope and pinpointed the noise. Based off of what you say about the noise I would only guess and say fan clutch.
ReplyVisitor, June 21, 2011, 09:53
thanks for answer - forgot to say there is a little movement if you grab fan on each side?? I guess it,s time to pull the fan I think ??????
ReplyVisitor, June 21, 2011, 10:29
It is not unusual to have a little play in the fan clutch but it could very well be the source of the noise.
ReplyVisitor, June 21, 2011, 13:47
thanks 'i just got back from a dealer definetly a water pump !!!!lots of money!!!!!!!!that's why god made credit cards !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ReplyVisitor, June 21, 2011, 16:39
I personally am working on a 94 Toyota pickup 22R-E engine that has a squawk noise when first start and just as shut off the negine. The noise I heard with my stethoscope was loudest at the idler/tensioner pulley bearing at top front bracket of engine for the p/s belt. I also know that noise can travel thru metal and start one place but be loudest at another. I removed that belt and started the engine and the noise was still there. The other belt ran the water pump/fan and alternator. I removed it and then on the restart the noise went away. I did hear the noise at front of w/p housing before but not as loud as the idler/tensioner bearing. When I physically grabbed the water pump pulley and turn it I could duplicate the squawk noise. Taa Daa. I found the noise source and likely the dealership went thru the same process as I did to pinpoint. I sold my job to my customer because I warned him that noise travels thru metal and untill the diag process I could not guarantee the source till step by step diag revealed the noise. My customers here in Oregon keep me busy because I don't charge like the big overhead shops and I let them buy the parts at my discounted price. Believe it or not, there are tons of us techs out there that work for shops or ourselves that are just as honest. This site helps us with the bad mistrust feelings that some customers have for techs. Anyways, good luck.