2000 BMW 323i Q&A

2000 BMW 323i Question: Intermittent overheating & interior fan

Intermittently the engine overheats and the cooling fan does not go on; thermostat has been replaced; is it the fan relay? Interior fan at times goes on & off with no key in ignition -
Answer 1
Replace fan speed resistor for the interior fan issue. Check the wiring and readings of the coolant sensor connected to the bottom radiator hose. Does the fan kick in when A/c is actuated? as this should be your stage 2, which is also your overheat stage. Check water pump. The impeller could be free spinning on the shaft -
Comment 1
The fan does not always kick in when the A/C is turned on. The mechanic that looked at it said it's the fan module; I will mention your suggestion. Thank you. -