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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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#1 (permalink) Old 09-11-2009, 06:15 AM
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heater core question

Hi, still trying to diagnose my coolant loss. I have a e30 320i. Does the coolant still flow through the heater core when the heater is not on (ie the temp dial is turned to cold) i got told it didnt. However as i have half my dash currently removed i felt the heater core after driving around a bit and it felt warm?
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#2 (permalink) Old 09-11-2009, 10:00 AM
OMFG another one!?
 
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Coolant is not supposed to run through the core with the temp dial on the coolest setting. If it is doing so, the associated valve may be bad.

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#3 (permalink) Old 09-11-2009, 08:34 PM
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the heater core was definatley warm

not hot but warm. So the reason im still losing coolant with the heater off could be because a) the heater leaks and b) the valve is not shutting off properly. Is it possible it could be a leaky and faulty valve?..my coolant was dripping right out from the bottom screw holding the heater core in so i guess not. I think i might bypass it untill i get the required replacement parts. To bypass it do you simply block both ends of the inlet and outlet hoses off or do you loop them by joining them with a bit of alloy pipe and a couple of hose clamps?

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#4 (permalink) Old 09-11-2009, 10:02 PM
OMFG another one!?
 
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You may wanna find more detailed advise. To say anything myself, I'd have to see it.

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