I just replaced the expansion tank. veh overheats. top hoses and fluid in tank are cold, while the rest of the veh overheats. is it the thermostat?
overheating on 1999 BMW 328i
E36 six cylinders a prone to thermostats, blocked radiators, air locks and mostly water pump failure. Remove the water pump and re-assess, the impeller separates from the shaft and no longer provides circulation.