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Old 09-15-2002, 02:21 PM
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I found this post in another forum and i have a similar problem any suggestions ?

I have a whine noise that I thought was the transmission, as it changes pich with shifts...automatic. Well I took it to a tranny shop and they say not the trans. They think it's comming from the rear of the engine or under the dash. I did my own investigation and it seems the noise is in the heater core. What do you think of that? What would cause it? thanks.


I disconnected the heater core and just looped it back to the motor. The noise is bearly there but it's there at around 2000 rpms. The heater core was acting as a speaker. I wonder if it has do with an imbalance in the motor? or if I have a bad bearing in the motor? Anyone heard of anything like this?

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Old 09-15-2002, 02:31 PM
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might be the front pump does it whine more as you increase rpms?
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Old 09-16-2002, 04:56 AM
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If it is truly resonating through the heater core I would suspect a bearing in your waterpump, 'though I've never experienced something like that. I did have a muffler that rusted inside and as you drove it the material would sart interupting the flow and it started making a jet sound so loud you thought an airliner was getting ready to land on top of you.
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Old 09-16-2002, 01:56 PM
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[quote]I disconnected the heater core and just looped it back to the motor. The noise is bearly there but it's there at around 2000 rpms<hr></blockquote>

I assume that this is a FORD?

If the heater core has been replaced, it is most likely that the insulator was damaged and/or torn and the tech decided not to replace it (it is available for service). With the water being pumped through it (pulsations) it probably created a howling noise. One you disconnected the water supply, vehicle vibration alone is most likely causing it to vibrate and make the noise at only a certain RPM now.

It's either that or ghosts...
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Old 09-16-2002, 04:33 PM
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It actually whines like an AM radio when you have a leaky coil wire only not as loud now. New water pump and actually a new heater core... yeah its a ford lol 351 w to be exact...

Im looking into the insulator thing ... however im not sure were or what is is lol , going through my tech manuals now ... thanks for the leads !!
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Old 09-16-2002, 10:56 PM
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The FORD basic part no. is 19A672. It is actually a molded foam insulator that surrounds the heater core and protects it from vibration. It is usually not replaced and the core is left rattling in the heater case.

Hope I have helped and not sent you on a wild goose chase. But it sounds as though that is where the noise is coming from. Another thought is that 5.0 MUSTANGS had a pressure restictor in the inlet heater hose to prevent core blowout at high rpm's (police package). If you have this model, the aftermarket hose will not have this restrictor.
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