Scenic - gauge shows overheat but engine not hot !

THe fan thermostatic switch and the temperature guage sender are two=20 seperate components.

So if the fan is on anf the guage is showing hot, there's a pretty good=20 chance that's the case.

--=20 Conor

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THe fan thermostatic switch and the temperature guage sender are two seperate components.

So if the fan is on anf the guage is showing hot, there's a pretty good chance that's the case.

Which would point to it being an airlock. That's if you haven't already lunched the head gasket.

Dont understand why the engine wasnt hot when I stopped though....

No - I havent ruled out the head gasket but I thought an airlock would only happen once......

How do you check and/or solve this?

When you say the engine wasn't hot, how far had you driven? Did you put your hand on it? If there is an airlock then the only way to solve it is to bleed the system. They can continue to occur more than once. Try a Rover K Series engine, they can be a total bastard for airlocks.

If it's anything like my Laguna it'll have bleed screws all over the place. Start with the lowest one, undo it until water flows freely. and work from there. Check the HBOL. You will probably have one at the heater matrix pipes. This will be the last one. Keep the heater controls at fully warm as this opens the valve to the heater matrix and makes sure you are doing the full system. Have the engine running and remove this. When the engine gets hot it should literally start a small fountain out of here with no spits from bubbles.. When flowing freely replace screw. Keep an eye on the water level as you do this. Have someone keep an eye on the temp gauge too.

If you have no joy with this, pull the thermostat and test it. Again, if it is like the Laguna I had you will need to put it in a pot and boil it. The thermostats on Renault open at stupid temperatures. My Laguna was fully open at about 99degrees so you could put it in freshly boiled water but by the time you poured it it had cooled a few degrees and it was very hard to tell if it was opening at all. It took me a while to twig.

Drove about a mile....

Yes. It was hot but not so hot that I couldnt touch it....

You might as well try the above first before thinking head gasket. Can't hurt.

For the love of God...

--=20 Conor

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Am I missing something here?

Yeah...IT'LL STILL BE LUKE WARM TO THE TOUCH AT ONLY A MILE.

THat clear enough for you?

--=20 Conor

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WHICH IS WHY I WAS SURPRISED THAT THE GAUGE REGISTERED IT AS OVERHEATING !!!!!!!

Also, is there any need to be so aggressive ?