thefastandthecurious
New Member
Hi guys
I've got a E90 320i (N46 Engine). Recently, I had to change the thermostat housing as the seal was leaking coolant, during which I had to disconnect the thermostat. After putting everything together, I decided to check the coolant temperature via the hidden dash menu and INPA and saw some concerning readings. After a short drive around the block, the coolant temperature steadily increased and reached 109 degrees celsius before I shut it off. On my previous cars (not BMWs), +/- 90 degrees was normal and over 100 degrees would be classified as overheating. On INPA, there is another block "coolant output temperature" in addition to the "coolant temperature" which remained at around 46 degrees celsius. When I checked under the hood, the upper radiator hose was significantly hotter (burn to the touch) than the lower radiator hose, which was warm. There was no thermostat related codes when I scanned the car with INPA and no dashboard warning lights.
I've never really paid attention to my coolant temperatures before this, so is this normal? What temperature does the thermostat usually open at, being electronically controlled? If the thermostat wasn't plugged in properly, would the car throw an error code at all? Is there any way to manually open the thermostat via INPA or something to test that it is working?
I'm really scared of blowing a head-gasket. Any advice is appreciated!
Thanks
I've got a E90 320i (N46 Engine). Recently, I had to change the thermostat housing as the seal was leaking coolant, during which I had to disconnect the thermostat. After putting everything together, I decided to check the coolant temperature via the hidden dash menu and INPA and saw some concerning readings. After a short drive around the block, the coolant temperature steadily increased and reached 109 degrees celsius before I shut it off. On my previous cars (not BMWs), +/- 90 degrees was normal and over 100 degrees would be classified as overheating. On INPA, there is another block "coolant output temperature" in addition to the "coolant temperature" which remained at around 46 degrees celsius. When I checked under the hood, the upper radiator hose was significantly hotter (burn to the touch) than the lower radiator hose, which was warm. There was no thermostat related codes when I scanned the car with INPA and no dashboard warning lights.
I've never really paid attention to my coolant temperatures before this, so is this normal? What temperature does the thermostat usually open at, being electronically controlled? If the thermostat wasn't plugged in properly, would the car throw an error code at all? Is there any way to manually open the thermostat via INPA or something to test that it is working?
I'm really scared of blowing a head-gasket. Any advice is appreciated!
Thanks
Last edited:
