2003 Range Rover Vogue overheating

Hi Anybody, I have a 2003 Range Rover Vogue 4.2ltr V8 and it overheats when driven and the hoses become very hot and hard. Have you any suggestions as to the cause. The vehicle is great and doesn't have the same problem when stationary. Am considering taking the thermostat out to get the vehicle to my local Land Rover dealership.

Is that an L322? If so it sounds like the V8 problems continue in new engines.

The early V8 BMW engines are 4.4. The later Jag engines are 4.2.

No idea about the problem however.

The hoses in my L332 become hard when the engine is hot, however the gauge always show normal operating temperature (midway position) and does show any signs of overheating, these engines always seem to run hotter than others though.

As for removing the thermostat it comes as a complete housing which fastens onto the waterpump, i have replaced both items over the past few weeks.

What signs is your engine showing of overheating?

should read does NOT show signs of over heating

SLY-SY said:

The early V8 BMW engines are 4.4. The later Jag engines are 4.2.

No idea about the problem however.

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I think the Jag v8 was a nightmare too, every one I have seen advertised appear to have had new engines by 50k miles..? Havent they got chromed cylinders that give problem...?

JellySpanners said:

I think the Jag v8 was a nightmare too, every one I have seen advertised appear to have had new engines by 50k miles..? Havent they got chromed cylinders that give problem...?

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Nicosil?

The V8 nicosil coated engines where only in jags pre 2000 (approx), many where replaced under warranty by Jaguar with engines that had steel liners.....at the time they were trying to blame the additives in the fuel

If its a 4.2 from 2003 as stated then it must be a supercharged version as the only N/A V8s from that year were 4.4 from BMW.

Don't know if that makes a difference in fault-finding.

First 4.2 Jag engine was in 2005 on a 55 plate.

you're right actually. There wasn't such a thing as a 4.2 from 2003 that I'm aware of. So must be talking about having a 4.4.

Anyway, to original poster, I'm not sure what could cause it. Sorry!

If its pressurising it sounds like head gasket problems, need a chemical block test to check for combustion gasses in the cooling system etc...

Having said that alot of new engines have water pump impellor problems and can wear or fall off and cause all kinds of problems, not sure if this engine has any history of that nature...

too much antfreeze now the weather is warming may be a thought...?

The M62 engine in the early L322 has an electrically heated thermostat which allows the engine management system to alter the engine temperature e.g. it opens the thermostat when under load but closes it under part-load conditions to run the engine hotter for better fuel efficiency.
As can be seen on the attached graph (from my own 4.4l V8 L322 - measured using a Faultmate MSV-2) it’s not unusual to see coolant temperatures above 110 deg. C. at light loads.