[ahmruf]

hi guys, i have 2015 528i and low coolant level warnings turned on the system 2 weeks ago than i added coolant but today again i got same warning, coolant tank is leaking? or i got engine light on, code is P0597, its about thermostat heater control, circuit/open

and should i change water pump, when i change the thermostat at the same time?

[95blkmax]

Originally Posted by ahmruf

hi guys, i have 2015 528i and low coolant level warnings turned on the system 2 weeks ago than i added coolant but today again i got same warning, coolant tank is leaking? or i got engine light on, code is P0597, its about thermostat heater control, circuit/open

and should i change water pump, when i change the thermostat at the same time?

It's been a few weeks since you posted this so I hope you got it taken care of by now. But it seems like you had 2 things going on and both could have caused the other unfortunately.

Yes, due to age and being that they're right next to one another, if you're replacing the WP or the Tstat, it is generally recommended to just replace both.

F10 N20 there's a few things that are common leak points- Oil filter housing/ heat exchanger, plastic mickey mouse fitting at the front of the cylinder head, upper radiator hose, the vent line, the expansion tank itself, the cap on the expansion tank. My recommendation would be to do a visual inspection for any signs of coolant residue. If none is found, then pressure test the system and looks for venting vapor along the circuit. Replace component, repeat test until you do not see any more leaks. Fill with coolant and perform coolant bleed procedure, and you're good to go!