What is this thingy...

[Stealer Of Souls]

http://www.geocities.com/srsvengence/ts ... c00057.jpg
http://www.geocities.com/srsvengence/ts ... c00056.jpg
*MOD edit: made you pics links so to coply with image size rules, ta, Santa*

Hey. Found this on an AE92 Levin. It was mounted up by the horn. I suspect it's a temperature sensor for the air con.

Denso
C77500-1941

Can anyone confirm this?

[Mr Revhead]

yep thats an air temp sensor

[BZG Wagon]

Why does the A/C need a temp sensor?

[Stealer Of Souls]

I was wondering that same thing...

Revhead. Don't suppose you know any specs about that sensor?
From what I can gather I think its a NTC thermistor encased in a plastic housing to slow down temperature transients. Which is good. But I don't suppose you know it's temp/resistance curve or anything. I'm not keen on doing the old empirical method given inaccuracies...

[Mr Revhead]

i wouldnt have a clue. electrics is a black art i steer clear of!!

[tomo1985]

My 1997 carib has one up behind the bumper. I'm pretty sure its hooked up to the outside temp gauge which is just under the rev counter.

[Stealer Of Souls]

As far as I can tell the AE92 doesn't have an external temperature guage... Could be wrong... I'll have another look I suppose...

[markbrown06]

yea thats the ambient temp sensor for the aircon

[Stealer Of Souls]

Well. There we go. I have no real idea why but that's what it's there for...

Now. Does anyone happen to know what it's operating curve looks like? I think it's about 1.7k@20deg and about 1.2k@32deg.
Does this sound about right? Is this thing linear? I really wanna use it to measure the radiator temperature to trigger a op-amp circuit... Saves me buying one and then having to figure out how to encase the thing...