Thread: DIY: (E9x) M3 Thermostat Replacement
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      08-12-2019, 09:54 AM   #120
Lor443
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Drives: 2010 M3
Join Date: Apr 2012
Location: Brooklyn

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The OP mentioned that step 6 is optional, is it possible to change the thermostat and sensor without draining the coolant and just topping off what you lost when removing the thermostat housing?
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