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Snapping Noise from Heater Core 85 Caprice

Hi,

I've got a crackling / snapping sound coming from my heater core. If I pinch off one of the heater hoses, the noise stops. The noise comes on acceleration, and at a slight rev in neutral. Causes I can think of :

1) Steam is forming somehow in the cooling system, and I am hearing the old-fashioned steam radiator sound in the heater core. 2) Air bubbles are trapped in the heater core and are slapping around in there. 3) A piece of debris (metal) is flopping around in the htr core.

Additional info : I do have a coolant leak at the rear of the intake manifold. Maybe air is getting into the system there.

The car is an 85 Chevy Caprice. The heater core is only 3 years old.

Any ideas ?

L
Reply to
Lecher9000
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That water leak scares me. My V8 experience tells me a leak, either front or rear, allows water to enter lubrication system. This will sludge up engine, and ruin bearings. The noise sounds like steam.

Reply to
451 CTDS

How would steam be forming in the heater core ? My coolant is 50/50 coolant and water, and the car is not overheating.

Thanks

Reply to
Lecher9000

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