Question:
When my heater is on, my car makes a high pitched squealing. The noise is louder when driving slower, then goes away after I go faster. After driving for a few minutes, the noise goes away after it's warmed up. There's no noise when my heater is off. I'm guessing it has something to do with a fan.
Answers:
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When a car is cold, the fan belt will squeal if it is loose. You can get a can of fan belt lubricant and squirt it on the fanbelt when the engine is cold. If the car does not squeal when you start it, then there is no problem with the fanbelt. Your car might have more than one fanbelt, so squirt this stuff on all of them.
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If it then squeals when you turn on the heater, then the problem is in the heater, not the fanbelt.
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Get a shop manual and find the heater and lubricate it with spray lubricant on the shaft of the fan cage.
The thing is, that you will not turn on the heater when it is warm. The fan blade will squeal when it is cold, and so will the fan itself. You have to isolate the problem.
If you still get a squeal from the fanbelt, then have it tightened, or use the shop manual to learn how to do this yourself.
Do NOT attempt to tighten anything with the motor running.
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dendung on how you got your settings for heat it might just be your belt try using some belt dressing see if ti goes awayCar hesitates to start after almost a week of not using it. Is this normal?
well it all depends on the year and make of the car ,if its a 1 peace serpentine belt it could be to things ,1 the belts stretched,2 your tension pulley getting week which causes that sound to .now if a couple of belts under the hood most of the time the belt for the fan stretches just loosen up the bolt and pull the tension pulley arm up , tighten up the belt stops that horrible sound.or even simpler then that buy stop squeak it in a can stops belts from seekingRemoving gum from car without ruining paint?
If this happens when the selector is in the "defrost" position it is because the A-C belt is loose. The A-C cycles at that time to keep itself lubricated during winter.DOES A CARS HEAT BURN GAS? WHAT ABOUT AC? HEATED SEATS?
When the control for your system is in the defrost mode it uses the air conditioner unit even in the winter. The quick fix is to un-plug the compressor clutch, and it can't cycle on. You need to replace the belt that runs the compressor. If you have the serpentine belt "DO NOT" put belt dressing on it, as this stuff is made only for V-belts, and will tell you so right on the can. A belt that is stretched, cracked, and looks shinny, will slip until it gets hot. You can attempt to tension up the belt, but beware that too much tension can burn up bearings in the AC compressor. This is why it is best to just replace the belt. Raise the hood when it is doing this noise, and attempt to determine exactly where the noise is coming from, as this will be your best defense. Also try taking the heat control back to another setting such as heat only, and see it it goes away. You want to make certain it is not a sticking bearing in the AC clutch causing this problem. I think we would all agree the noise is from a slipping belt, but one must go one step more, and determine what is making the belt slip, and/or if it is in fact the belt that is the problem. I have seen a bad blower motor make this same noise, and this is why I say it is important to get to the noise when it is taking place, and you will know what to do to correct the issue.Glad I could help, Good Luck!
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I,m guessing as most of the others here that you have a bad serpentine belt. Have a shop check the condition of the belt as well as check the engine for correct pulley alignment and the condition of all the accessories that are driven by the belt I.E. water pump,alternator,air cond. compressor,and especially the auto tensioners and idler pulleys.The most likely culprit is your fan belt, your vehicle has either a serpentine belt, or a conventional v-belt, in either case try opening the hood, and while it is making this noise, try squirting some water on the belt, if the noise stops, and your vehicle makes provision for adjusting the belt, do so, if there is no provision to adjust the belt, it, and/or the idler pulley will likely need to be replaced. if water does not quiet the noise, you may have to disconnect the blower to ascertain what is causing the noise, disconnecting the blower, will eliminate, or pin-point it as the problem. Other possible, although not too likely causes may be the alternator, A/C pulley bearing, e.c.t., with serpentine belts, these problems are a little more difficult to pin-point, you may be better off having a professional check into it. Hope this helps.
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