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A few years ago I had the same problem on my mini. The fan kicks on when it wasn't running hot and it stayed on after the engine was off. It turned out to be the fan switch. If I remember correctly, it was a small part and easy to replace. The next step would have been the temp sensor. That's...

In the typical Friday afternoon traffic on 101 South, I finally figured out how the cooling system works. Temp A shows coolant temp in the engine block. The thermostat is the first gate keeper in the system. It doesn't open until the engine gets up to temp at 180. It is mechanical and...

So temp A is from the primary sensor near the thermostat. Temp B is from the sensor on the firewall near the heater core. Does A have anything to do with B?

Temp B is from the radiator. I just checked after arriving at work and the reading on the cap is consistent with the OBD figure. The lower rad hose was warm, the top of the rad was cool to the touch, upper rad hose was hot hot hot. For this one-hour drive, coolant in the radiator wasn't...

For the drive to work this morning, traffic was heavy. Temp B didn't increase much until much later into the drive. It climbed to almost as high as temp A in the last ten minutes (880N Oakland area). Having watched a 3D animation on YT, I believe temp A is the engine side of coolant temp that...

I know nothing on this topic, just came to see how this pic fits in any discussion. 😂

MAF sensor cleaning: easy Throttle body cleaning: not so easy First ever cleaning at almost 168K miles I wasn't able to disconnect the TB wires and had to do the cleaning above the rad hose. The corners where the ends of each half moon meet the rod are most difficult to clean. I couldn't find...

Here's the report on the sample from 9/1/25. I was tardy and submitted the sample very late. 🤦 Comments from the lab: There's a lot less metal in this sample after the shorter run. That's not surprising given the drain and fills you mentioned and the lower wear is nice to see. The metals here...

The app gives me two coolant temperatures, A and B. A is the figure that I am familiar with (ideally 194~212). B is higher than ambient, lower than A, and fuctuates similarly. Do we have two temp sensors for the cooling system? When Temp B was around 120, the lower rad hose was cool to the...

It sits so low with almost 0 wheel gap. 😱 Must be on air suspension?