Question about 1999 Chevrolet Blazer

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For months there has been an intermittent ?swishing? noise while my car is in park or driving. Each time I took it to my mechanic, however the noise stopped each time. This last time I was told that the water pump was making a slight noise. This week the ?swishing? is more frequent and louder. I just called my mechanic and was told it could be the Heater Core. I have an appointment to drop it off on Saturday, but now I am skeptical that it will be diagnosed correctly. I am reading that it could be a vacuum leak or the battery is making the alternator work too hard. Please help as I am a woman with no clue . . . about cars.

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I have heard several heater cores gurgle on these. Usually the noise is most noticable when accelerating and will sound like it's coming from the right side of the dash ahead of where the passenger sits. If this is it it can be very difficult to get it to completely stop making this noise [and we've tried many different tricks to do so] It doesn't hurt anything but is annoying. The test we use to see if this is what's making the noise you are hearing it to temporarily bypass the heater core by disconnecting the heater hoses and looping them together under the hood and driving the vehicle for a day or so. If the noise is gone you've got your culprit. If not then at least you've eliminated a suspect. Hope this helps a bit and good luck!

Posted on Jul 08, 2010

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Posted on Jan 02, 2017

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