You helped me last time my radiator had blown a hole in it and come to find out the water temp sensor was bad. Replaced and all was good.
I have been on this site before and you guys and gals are amazing so this may be a good one for you. This is very interesting....
I have a 97 nissan altima with 175,000 miles. She is running great no smoke not miss no nothing but here is the problem: When i started up the car last week i heard a humming noise. This noise will stay in sync of the cars RPMs if i rev it it will rev right with it. I know its comming from under the hood but where im not sure??? I replaced the battery since it was old so i know that cant be it, i had the alternator tested and all is good. The belts are in good shape. i did notice that i was a little low on power steering fluid i topped it off but still have the same noise. I have let 2 different mechanics if you will lisen to it and one says that its probley the bearing in a pully and the other thinks pully in the motor running the timming chain. Now that to me is real bad news. So far i havent found a shop that i can trust yet so i guess that why im comming to you and trying to do most of this myself.
Let me know what your opions are and what i need to do cause u have earned my trust.
Look foward to your comments, Thanks again, Joe North
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Re: Need your help again .....
another bearing to look at would be the pulley bearing of the compressor or the tensioner or belt adjuster. these two bearings ( if you have them in your car) are sources of noises which are sync with car's rev.
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Is your 3800 producing normal heat? If so, the temp sensor is probably bad...If not, try replacing the radiator cap...if your system has air trapped inside, it usually runs hot, not cold...the heat is the key to functioning properly for you...Your radiator is a 4 stage huge system that normally cools very well...if you have heat, I still think your temp sensor is bad...ask to see one at your parts store, will help you to locate it. Hope this helps.
If you have replaced the coolant it may have trapped air..you fix this by allowing the vehicle to idle with radiator cap off and allow to get to operation temp ever so ofter squeeze the lower radiator pipe this will help move out trapped air when the thermostat opens it will draw the coolant down just add water when it does..if the thermostat doesnt open you may have a bad or stuck closed thermostat. On bad news side if the temp shoots up under acceleration and drops off to norm on deceleration you either have a blown head gasket or cracked head.
CLUTCH ON COOLING FAN FREEWHEELING. COOLING FAN SHOULD HAVE RESISTANCE WHEN TURN WITH HAND WHEN ENGINE HOT.IF NOT FAN FREE WHEEL FAN CLUTCH NEEDS TO BE REPLACED.IF COOLING FAN OKAY.YOU COULD HAVE BLOWN HEAD GASKET.YOUR RADIATOR AND ENGINE BLOCK NEED FLUSHING OUT.CHECK WATER PUMP FOR LEAKING WEEP HOLE IF LEAKING REPLACE WATER PUMP.
Have system pressure tested when cold and full to top. Pressure test will force coolant out and you will be able to trace the leaks location. Hopefully it's a small hose leak and not a major problem like a blown head gasket or cracked head.
3 blown out radiators....define this. My accord has 224,000 miles on it, same radiator, same clutch. And the beemer blows radiators? Makes 'em explode? Can't imagine anyone making a radiator that blows up all the time. You keep buying the same model?
Anyway, check: air gap in system, bleed the system while it heats up. Water pump. don't see it being replaced. the older ones had plastic impellers. is the auxillary fan working? It should come on all the time when the A/C is on. Clutch on belt driven fan ok? put in a 12 degree cooler thermostat and drill two 3/16" holes 180 degrees opposite each other.
Blown head gasket or two can cause overheating. Bad timing. did you change a good or bad radiator sensor? how'd you test it to determine it was bad? Don't just replace parts, determine they're bad. Replace enough parts and $14,000 later you should be ok.
Check for possible water in oil, also remove radiator cap and start engine does water want to pump out of radiator, is there white smoke coming out of tail pipe, if yes to any of those blown head gasket, if not sure yet remove spark plugs crank engine over is there any coolant coming out of spark plug holes, if yes blown head gasket, and last have a block test any repair shop can do this.Good luck
have u replaced the radiator and hoses? Thermostat could also be stuck open. Water pump could also be your issue. with motor cool and of remove radiator cap(cap may be bad as well) top-off fluid and start car check for fluid flow with flashlight. Water pumps typically leak from what is called a weep hole when the shaft seal fails. Yours will be located under the timing cover (drivers side) running of the timing belt.
Hit me up after u have check on these.
hi its rob cylender head or cylender head gasket or ileak in cooling system check oil for creamy white sludge if non then take of radiator cap start engine see if it bubbles up turn of engine and smell into the radiator for fuel check accesive amounts of water or white smoke coming from tailpipe ether one of these maens cylender head of gasket blown