Last night my Pathfinder started making this squealing noise, under the hood. It didn't last long and then stopped. But then the engine started heating up and the temperature gauge began to rise into the hot zone. Luckily I was almost home. Any ideas why it is heating up. The belts look okay.
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It may be the brick in the catalytic converter that has came loose inside of the chamber, and if it blocked the flow of exhaust, it will diminish the power to the engine, and if the blockage becomes dislodged, then power will be restored. If this is the case, then the catalyst will need to be replaced. This might be what you are hearing.
you developed a knock in the engine, sounds confusing but your engine computer can't separate bad bearing from pre-ignition, engine knock, to cure this your computer retards the spark, to the max to stop the knock, confuses the computer to the max
Use a mechanic's stethoscope to locate the culprit sqeal. Have a technician rev the engine, in order to produce the squeal. Lay the stethoscope tip utop the water pump, nearest the armature. Locate squeal in this fashion against the idler pulley(if applicable), the alternator, the air conditioner compressor, power steering pump (if applicable), the cam shafts (if applicable), and finally the crank. This will help isolate the location of the squeal.
MOST LIKELY HAS A PLUGGED TRANSMISSION FILTER.
TORQUE CONVERTOR CLUTCH FAILURE COMMON.
CHANGE TRANSMISSION FILTER AND ROAD TEST.
IF NOISE IS GONE AND RUNS NORMALLY, CHANGE TORQUE CONVERTOR AND RESEAL TRANSMISSION.
yes...your engine belt is little bit lose that's y its causing noise...and hope when u speed up..it will stop squealing ..right?? so just tight your engine belt little bit and it will solve your problem in a min...take care n have a safe journey...n also if it help...rate it plz
The noise is most likely the serpentine belt. Check it's condition and that of the belt tensioner. It sounds like the belt is slipping, causing the squealing noise u describe. As the belt warms up, it's getting a better 'grip' and the noise stops. Turning on the heat also turns on the a/c in newer cars, this added drag on the belt (one more component to turn, the a/c compressor) would explain why it happens when u turn on the heat. Is the belt original? If yes, it's time to change it, and check the belt tensioner to make sure it's doing it's job of keeping the belt snug on all the pulleys. Let me know how u make out.