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hfh330i · 06-04-2007, 04:24 PM

Perhaps you guys could help:

For the '87 535is

I need to swap out a leaky coolant hose. I’m currently at work, so I can’t go outside to check the specific hose but I’m pretty sure it’s the hose that attaches to the thermostat housing just in front of the fan and snakes its way to the bottom the radiator. Is it necessary to drain the coolant from both the radiator and the engine block in order to swap out the hose or can I just drain the radiator, and provided that the coolant looks good, perform the swap, top off the fluid, and bleed the system?

06-04-2007, 04:24 PM	#1
hfh330i Jaded Join Date: Dec 2003 Posts: 308	radiator hose swap... Perhaps you guys could help: For the '87 535is I need to swap out a leaky coolant hose. I’m currently at work, so I can’t go outside to check the specific hose but I’m pretty sure it’s the hose that attaches to the thermostat housing just in front of the fan and snakes its way to the bottom the radiator. Is it necessary to drain the coolant from both the radiator and the engine block in order to swap out the hose or can I just drain the radiator, and provided that the coolant looks good, perform the swap, top off the fluid, and bleed the system? __________________ 2013 M3