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I have a question about this -...

The new sensor arrived and was fitted last night. Not before I did a little pre-fit test with a cup of hot water to make sure it functioned. Once in and up to temperture, the guage sat at just below the mid-way point and didn't budge, PERFECT! The company that I bought the gauge from and this...

Does this help? It's all there is on there.

Match? I can check the width for you if they're of interest. https://www.landyzone.co.uk/land-rover/price-drop-5-x-110-90-defender-wheels-and-tyres.346785/

Christ I hope it's that simple....and cheap!

Well it looks like Ihav epreviously been supllied the oncorrect sensor. Now there's no point pointing and blaming but I'll say that one supplier has been very helpful and genuinely intersted in chassis and engine numbers to supply the corrct part. The other supplier, delivered late, and have...

Ok, I'm not going to say anything just yet but....I think I may have the wrong sender, maybe! I need to do a little more digging on the various websites to confirm.

I've measured the temperature in a number of places and it's reading pretty much where it should be, taking into account a tempeature loss through the material used at each point. I could use an 8 way thermocouple connected to a 100Hz data logger from work but I don't think I'd read a wildly...

Right, that's plan number one. The sensor is relatively cheap so I'll get that ordered tomorrow and see what happens.

I'm fairly convinced it's the sender/Gauge combo. It's NOT overheating but is only indicating an overheating issue. If the sender was not immersed in the coolant and instead was in an air pocket, would it register a high or low reading on the gauge? If high, then I'm looking at an airlock OR a...

I'll try to find out what the sensor should be outputting to the gauge....Anyone know where to look? Please don't say 'The internet' :)

That's pretty much how it was configured before I put them back to how they should be. In effect, there was only really one pipe going to the heater matrix and the other was 'T'd' into with 90 Deg bend, thin walled plastic pipes. Very restrictive and the pipes hardly got hot. They both do now...

I stuck the garden hose into both ends and let it run clean so all the coolant was out. Good flow? hmmm, it came out but not at the same rate. I put that down to the make up of a rad,matrix with all its little waterways. I did the same with the main rad too.

Well that all makes sense. I just need to find what it's sendint and what the guage is expecting. I still have the issue that the heater isn't blowing hot and that nagging air pocket possibility.

The fan, well it turns with the engine but it's not over heating, only indicating an over heat. Am I missing something?

I'm more sure of the guage than the sender, I think. The guage was bought very recently and I gave them all the details of the car. I'm now wondering if the sender is the wrong part, ah I don't know. I thought it was only the water pump that might not now be right. I'm sure there are some tests...

The sender is in the front of the inlet manifold, right next to the thermostat housing.

I know the supply and ground to the guage are ok becuase they are shared with the fuel and ummm...the other guage in the row of 3. They also share a ground so it can only be the signal wire then. The signal ground will be the sensor screwed into the metal of the engine so it's back to that...

There's only the one wire and I assumed that went to the guage only, no?

Just an isolated air lock in the area where the sensor is then, which is also partially blocking collant to the heater matrix?