Hello dear Range Rover friends!

Sorry for my poor English.

I have a 2010 LR322 TDV8 272hp.

I was on vacation last weekend and drove up a steep hill with lots of curves. The drive took about 25 minutes. When I arrived at the parking lot, I noticed smoke in the engine compartment. I immediately opened the door and saw that the expansion tank (coolant) was boiling and the coolant was pouring out. My entire parking space was covered in coolant. I let the Range Rover cool down and hiked up the hill. After I got back, I got water from a pub and topped up about 2.5 liters. My first stop was the gas station, where I got 2 liters of coolant. I filled it up to the max and then drove about 400km home. I checked the tank several times during the drive to see if it was leaking, but it held the coolant and it didn't boil over. What's interesting about this story is that the temperature gauge was within the normal range when I drove up the hill, but then the fan didn't turn on in the parking lot. But it's working now.

I'm planning to replace the expansion tank anyway, as I've heard several times that it's causing problems. Do you have any tips for me on what else I might need to replace?

I'd also like to change the coolant. I've already topped it up with a G12+. Is that correct?

Thank you in advance for your answers.

Hi everyone!

I've now taken a closer look at the problem and found the error code using the IDD tool. While the engine was running, I noticed that the fan was rotating, but not at the required speed. After I cleared the error, the fan started rotating at a higher speed. Unfortunately, the error keeps reappearing.

Does anyone have any advice on how to proceed?

Thanks.

deleted - got the wrong code

Last edited by pcourtney on 30th Apr 2025 2:33pm. Edited 1 time in total

Thank you for the tip.

Are you absolutely certain it's the oil pressure sensor?

I just did a drive with live data and found that the "Variable viscous fan duty cycle" value drops to 0% after a few minutes, which might be causing the error code.

Click image to enlarge

I deleted my comment about the Oil Pressure Sensor - sorry wrong code

To illustrate this, I've attached a graphic where you can see that the value suddenly drops to 0 and the RPM goes crazy.

I don't know if this helps but this is from the 4.4 workshop manual from this forum's wiki at the top right of the page.

Thanks for the info. I'll replace the viscous fan and hope that fixes the problem.