I recently acquired a 99 Range Rover Sport 4.0 and while driving in-town I am seeing that the temp gauge is rising (unless I turn the heat on). There is no white smoke or AF smell in the exaust, all the coolent is there so no leaks, and no drips from the water pump. All the fans are working properly. Driving on the highway is fine. Turning the A/C on will speed up the process considerably of course. I am in 90F degree weather currently for info. During the winter I drove this RR and it never overheated.
So, as long as the electric fans are working, these would be what is left to check, the viscus hub, and the radiator for blockage.
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Mike
Retired service manager, member of Solihull Society, SCLR, NCLR and the Santa Barbara 4Wheelers clubs.
99 D2, 3" lift, CDL with Detroit,T.T. lockers, 4:11's,H.D. axles, custom ft/rear bumpers with sliders, a 9500 HSI Warn winch and 5 HID's.
Ok so the coolant level was fine but I flushed the system anyways and refilled. It is still overheating after some time, but not when moving. It seemed to last a little longer this time, but we are also not having quite as hot of a day. Also, the viscous fan is operating fine.
The radiator and/or the a/c condenser may be clogged with debris reducing airflow. Might explain why you're ok at highway speeds and why it heats up faster with the a/c on. As someone said, try the simple things first!
Take the truck to a radiator shop and get it rodded out. It may be clogged up with gunk. They'll usually do the job for under $100.
My dad had an overheating issue on his 98 Disco, spent hundreds of dollars on replacing everything in the cooling system before realizing that he only needed to have the radiator rodded and flushed.
Taking my Range in for the service next week. Also changing the thermostat, as she overheats in the city and while idling through the car wash.
Don't be too surprised if the radiator shop tells you it cannot be fixed. When aluminum from the engine sloughs off into the system it sets uplike a rock in the radiator, Time for a new one
I have a 1996 p38, the water pump went bad, so I replace it along with the therostat, upper and lower Radiator hose. Filled it with 50/50 coolant (per the manual), drove it for about 20 min.'s then watched it overheat. I couldn't figure out why it was overheating the radiator wasn't clogged. A friend of mine explained it to me and provided the fix... when I filled the coolant reservoir it didn't fill the engine block all the way, there was still air in the system, so the coolant would get hot and boil back through the reservoir before it got hot enough to open the the theromstat and allow the coolant to flow. The Fix: When everything is cooled off, disconnect the upper radiator hose (from the radiator). Pour coolant through that hose directly into the engine block until it is full, reconnect the hose, top off the coolant, then start it up. This makes sure there is no air in the system, thus as the engine block heats up all it is heating is coolant (not air), once it is hot enough the theromstat will open and the coolant will flow. Hope this helps , it worked for me.
So I found a great Rover tech to work on my RR. Turned out to be a clogged radiator and bad water pump. Tossed in a new thermostat also and everything is perfect now.
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Overheat Question
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