Thread: Temp guage

Sounds like the sender has insufficient earth or is a wookie one.

Think someone recently had a question about her 202 series Landy running hot. Think the main problem was her thermostat and the reality reds run far hotter than the rover engines do so a higher reading on the gauge is normal.

Mentioned mine has a 82ºC thermostat but runs at 85ºC which shows about the top of the 'N' on the temp gauge. Landy red mark on the gauge is 105º which is just getting warm with the holden.

But it sure sounds like a wookie sender if it takes off for the red after sitting momentarily with the engine off. Should rise a little but not much and should fall if engine is turned on again.

I don't think that the sender is particularly expensive, I might grab a new one and see how it goes.

I'll check how good the earth is as well. Thanks 8)

How'd you get on ?

One other thing I forgot to mention is sometimes the voltage stabiliser can do strange things when they are on the way out. Normally shows as temp reads hot and fuel is low. Don't think that's your trouble but something to keep in mind.

With the ammeter make real sure the wires on the back of the gauge cannot touch the body.

I may be missing something, but there shouldn't be any earth on the sender unit, it earths via the engine block. By attaching an earth to the sender and running it to the guage, you have by-passed the sender unit, hence the non-functioning guage.

The sender works as the heat changes the resistance between the guage and earth.

I may have misunderstood your post though.

Yeah I was a bit vague

Did mean earth but engine earth not earth the sender, for the reason you point out.

As a side when I put the thematic fan on mine the switch, at the back of the block as I though that's where the most heat would be, wouldn't activate the relay. Traced it all back to insuffucent earth on the block, another earth to near the switch and no more problem.

Well it seems that Rocket provided the ultimate (and obvious) answer.

Apparently the sender on the holden motor is for a light, so it is just on or off.

That is why I was getting nothing or all on the guage ops:

I'll need to track down a landy one so that it shows the variation.

Thanks for the help guys [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]

Thought you had the land rover one in there. :roll:

Just remember with the landy sender and landy gauge and the holden motor, water temperature will not be exact. Well mine never has been, least with the thematic and belt fan it's some reassurance it won't be boiling. [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]

It will be more so that I can tell if it is getting hotter, not so much as to exactly what the temp is. Now I just have to get a temp sender and figure out how to fit it, or does it just screw in ??