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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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Old 09-23-2009, 04:53 AM   #1 (permalink)
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how should i byass the heater core?

It is going to be a tempory measure for now so i guess i will just somehow join the pipes together going into the firewall but how and what with?
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Old 09-23-2009, 06:24 PM   #2 (permalink)
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can't do that....I tried...just can't.....
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Old 09-23-2009, 06:28 PM   #3 (permalink)
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so, what you are probably concerned about is coolant leaking on the drivers
feet. That would be the heater control valve....you simply must replace
that part...you cannot bypass the heater core thing....
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Old 09-24-2009, 12:44 AM   #4 (permalink)
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huh?

Yes the heater core is leaking (the heater core its self not the control valve although i am suspect that the control valve isnt working corectly so might replace that too. Why cant I bypass it untill i find the correct replacement parts?
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Old 09-24-2009, 06:52 PM   #5 (permalink)
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because you can't...that's really all there is to it....you can't do that
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Old 09-24-2009, 06:54 PM   #6 (permalink)
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well, go ahead and look at this and then tell me how you would do it....fair?
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Old 09-25-2009, 12:52 AM   #7 (permalink)
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i would either

i would either create a loop in the pipes which go into the firewall or block both ends of the pipe off, for what reason are you saying this isnt possible?
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Old 10-04-2009, 04:43 PM   #8 (permalink)
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Hi, I have done it now. I am going to take my heater out and test it for leaks like this: drain fluid, put it in a bucket of water, block one end of, put a compressor hose into the other end and pressurize it to about 14 psi then watch for the bubbles. My question is do i set the temp gauge to hot before i take it out of the car so the valve is open would it stay open? and would this also show a valve leak?
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