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Old 10-30-2017, 12:59 PM
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Red face Heater Core Bypass w115 240d

Hello I have a 74 240d w115. The heater core is leaking coolant into rear seat area of the car. I would like to bypass the heater core but I want to do this properly. I have uploaded images to help.





I have an idea of the parts to use but I'm not sure exactly which hoses to connect and bypass also the size of the hoses. Thanks

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  #2  
Old 10-30-2017, 02:18 PM
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Location: Modesto CA
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BN:

1) Disconnect and plug the center hose on the heater control valve. [3rd pic]

2) Disconnect the right angle hose from behind the water pump, and cap the pump connection with a short piece of hose and a plug. [2nd pic]
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  #3  
Old 10-30-2017, 02:56 PM
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Location: Buffalo NY
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I there's an auxiliary coolant pump like in the W123, cut and cap the power line. These are known to short and cause in-dash fires.
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Old 10-30-2017, 10:21 PM
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Yes just block the pipes off, don't bypass as it reduces cooling system efficiency

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