Had new belts installed in Jan. Two months ago when putting the heat on turned on the button for it to blow assume this is fan belt; made LOUD squealing sound while driving on freeway. Noise stopped then more recently turning on the AC same horrible loud noise. Assume the fan belt or is it the motor?? Can I just spray it or what does it need??? HELP!!!
1988 dodge caravan. 3.0 6 cylinder engine. squeal under hood. sprinkled comet cleanser (powder) on alternator belt and squeal went away for about 5 minutes then returned. sprayed belt dressing on belt and squeal immediately went away again and returned in 5 minutes.. it only took a few drops so the problem is definitely not a bearing. also put wrench on belt tensioner and increased the tension of the belt by pulling on the wrench handle but the squeal did not go away. I have replaced the belt several times but the squeal comes back after a month or two.. It is noticably worse on damp, rainy days. what can I do.
REAL SOLUTION: I tried everything from new pulleys, 2 new best same brand. I put on GOOD YEAR GATOR BELT. When I buying this belt I felt that this belt is going to work and in next couple of minutes I read the packaging and it says THE QUITE BELT. I installed this best and BINGO NO MORE SQUEAKING NOISE FINALLY. By the way dressing made my belt erode and stuff from erosion of best stuck on the pulleys. I had to clean and sand it.
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Possible that the fan belt is not tensioned right or that the water pump is binding causing low flow through the heater.
If belt is not loose, release it more and try turning the water pump by hand to see if it is binding.
No heat or low heat in a water cooled engine is worthy of an immediate check as major damage to engine could be the result of continuing to drive it. Things to check:
These two things may cause no heat and possible not ever show as a problem on the temp gauge or temp warning light until far to late:
Low coolant/antifreeze level
Other possibilities that may/may not show other signs of trouble as well:
Failing water pump (this would also explain some noise, typically like a grinding, scraping or bad bearing noise)
Slipping belt (Typically associated with the famous belt squealing or chirping noise)
Clogged radiator and/or heater core
Non-operating temperature control valve
If the car has electric fan(s) for cooling, make sure they are turning on when the engine heats up. Blow out the radiator core with compressed air to get rid of bugs and other debris. Make sure the belt that drives the water pump is tight and in good condition. If the drive belt slips over the pump pully with a squealing noise, that indicates a bad bearing/seal in the pump. Finally, if combustion products are entering the cooling system through a blown head gasket, that can cause severe overheating. There is a chemical test to check for that problem. Hope some of this helps!
Check and tighten your drive belts / fan belts. The noise you are most likely hearing is the belt slipping on the alternator pulley. Its worse in the morning because the starter takes more out of the battery when the engine is cold. This in turn leaves the alternator with more load to replenish charge. More load = more resistance on the pulley to turn, hence the belt slips if too loose. Cheers John
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.
is it a squeal noise or what? explain more in detail. and yes the belt is directional in that it's path is designed to run in one direction only, no matter which side you put on the belt itself, the belt can be installed in one way or flip it over to the opposite side...doesn't matter, only matters if you installed it correctly on the routing of the belt. And the grooved edge is to be facing down inside the main pulley's that have grooves. If you have the smooth side down into the pulley grooves, remove teh belt and turn it inside out so that the smooth side does not ride inside the grooves of the pulleys.Sometimes, the tensioner pulley will squeal or the idler pulley will squeal when they are going out. If you are actually hearing the fan come on and off, that's normal, the fan is set up to turn on and off according to engine temperature and some cars they continue to run for a bit after ignition is turned off as well to cool the engine down. check to see if the belt is set all the way on all the pulley's it rides on and not partly off on the edge, realign as needed.