Heater Core Woes - BMW Forum - BimmerWerkz.com

3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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post #1 of 1 (permalink) Old 01-12-2008, 12:27 AM Thread Starter
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Heater Core Woes

So today I replaced my 1985 318s faulty heater core, and while I was at it I put in a new heater valve. It was actually quite easy, at least more so than I was expecting. Now the heater does in fact work, but a VERY weird sound has started. A knocking that gets faster as the engine get higher. It is not coming from the engine compartment. It is coming from the heater core / surrounding area. I don't know what would be making this noise other than the new valve. It does not make this sound when I turn the heat all the way down to cold.

Two side notes to this. My battery is not holding a charge, or I haven't driven it enough to get it charged back up (it sat a little while). And also I removed what appears to be an axillary thermostat that was in the line between the engine block and the heater core inlet pipes in the engine compartment. I had heard this was unnecessary. Was I wrong? Was that not a thermostat? Could a low battery be causing the valve to malfunction?

So any ideas would be great, I didn't even start to try and figure it out as it got dark out and I was burned from replacing everything all day.
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