Been reading about overheating problems on a Range Rover hse 4.6 model 2000.... Found alot advice as to what the causes for overheating could be but havent found any one that has found a solution... Has any one had a problem with their Range Rover and actually fixed it?? We have done everything, new heads, new block, new thermostat, water pump, radiator, you name it....

 

When does yours overheat - at highway speed, at idle, at 35-40 mph, or in stop and go traffic? With or without AC on?

 

can you give more info about what has been replaced and why,
I know you said its overheating but ..
Did you confirm this with an IR gun?
what does the gauge say when the engine is running,?
have you removed the air from the cooling system, ?
what happened when it first overheated.
With a new block and heads this should have cured things,
Has a block tester been used to confirm hydrocarbons in the coolant.
Who did all of this work

 

It wasn't as big of a problem on the bosch models, so I don't know if it applies to you. However, on the gems rovers a bad ground can cause the temperature gauge to display a hotter than normal temp. In either case, we do need a little more info to help you.

 

The reason I asked about AC on or off - I went through a lot of similar things (radiator, fan clutch, thermostat (180 degree high flow) - and still would overheat at idle - found previous owner had replaced AC condenser electric fans and reversed polarity. Simple test was engine off, strip of paper hang down between main fan and engine block. Turn on AC with engine off. Electric fans come on, and paper should blow toward block. Mine did not. As a result I believe I have a lot more sludge and varnish build up in my engine, if not almost toasted. I would guess that the blades to the fans could be installed reversed as well. As far as the temp guage - don't trust it. Get a scanner that can display the coolant temp. My guage reads in the normal range from about 135 to 250 on the scanner. It hardly moves between 175 and 230.

 

The temp shouldn't rise much above 210F. 250F is a recipe for disaster, especially on the rover v8. My rangie holds at around 195 to 200F during the summer with the A/C on at idle. The condenser fans only kick on when the temp hits 210F, and then sends the temp down to 199F before shutting off. The discovery and classics' condenser fans kick on the moment the compressor engages. The P38 is weird, they don't kick on for awhile and sometimes not at all. Some owners have nick named them the "ghost fans" because of this.

Savannah, I would be very concerned if my rover was hitting 230F. Hopefully that doesn't happen much .

Jaycar, do what Savannah has suggested and get a scanner on it to confirm that it is in fact overheating. You might also consider replacing your coolant temp sensor, as it may be faulty.

 

If it really is a bad sensor your scanner will give you a bad reading too. In that situation I would use an IR thermometer to double check.