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Jared D
Jared D, ASE Certified Technician
Category: BMW
Satisfied Customers: 1860
Experience:  Shop Supervisor at County Fleet
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Changed thermostat housing on 2007 mini. runs fine now but

Customer Question

changed thermostat housing on 2007 mini cooper. runs fine now but throwing 173b code randomly. sometimes after a few miles and sometimes after 100 miles or so. I still have water in system instead of coolant will that cause code to be thrown?
Submitted: 1 year ago.
Category: BMW
Expert:  Jared D replied 1 year ago.

You will want to make sure there is sufficient antifreeze coolant in the system. Using only water will lower the boiling point of the coolant and affect the performance of the thermostat. You should also make sure you bled the system properly from the coolant bleeder located on the top of the thermostat housing.

Expert:  Jared D replied 1 year ago.

Please let me know if you need additional information.

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