Q: very loud squealing sound about 15 minutes after driving

asked by on

Recently there is a very loud squealing noise after it gets hot. This takes about 15 minutes of driving. I've diagnosed everything from the pullies to the belt. The noise also occurs when the belt is removed from the car. When I am driving it and the noise begins, when I accelerate the noise goes away until I stop accelerating then it starts again. I've had two shops look at it and they can't find the problem. The last question I have is could this happen from "water" being filled in the radiator instead of the proper antifreeze? It also idles bad like it's misfiring until the car gets warmed up. My last effort was going to be to drain the water out and put the proper antifreeze in it to see if that stops the squealing. Any ideas?

My car has 213000 miles.
My car has a manual transmission.

Well, if you’ve removed the belt and still get the noise, that eliminates most of the normal causes like alternators and idler pulleys. I doubt it has anything to do with the water in the cooling system although you absolutely should change that to the proper coolant. Even if you live where the engine will not freeze, the antifreeze has certain corrosion inhibitors that you need in the system and a proper coolant mix has a higher boiling point than water. Anyway, back to the squeal. Sometimes, a vacuum leak can cause a whistling noise that sounds a lot like a slipping belt. The noise would go away when you step on the gas because the vacuum would be lower. If you can get a piece of 1/4 inch plastic hose about 3 feet long and put one end in your ear, it will make a highly directional listening device. You can point it around in the engine compartment and zero in on the sound’s location pretty easily. If that doesn’t work for you, contact YourMechanic. They can send a technician to your home or office to check out your squealing noise and let you know what it will take to fix it.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. very loud squealing sound about 15 minutes after driving

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine squealing when idling

Hi there. A squealing noise is a common sign that the rotating parts such as your belts are slipping on their pulleys. A worn belt will make this noise due to the loss of tension and gripping ability of the...

Q: I'm trying to start my car I put the cables to charge once I Take off cables it dies can you tell me wats wrong

Hi there. Diagnosing an electrical issue without inspecting the vehicle is very difficult. However a few things you might want to check on your BMW includes the battery, alternator or other electrical relay's such as the battery cables. The best...

Q: Attempted to change oil filter, but the oil filter cap broke, the top half of cap is broken off, the threaded part still remains.

Hi, thanks for writing in. I would proceed to carefully continue with the hammer and chisel. You could also try using a punch with the hammer to try and spin it out. The sudden shock from the punch could help...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...