E30 M3 head with third sensor on coolant rail?

[Italian M3]

Is this an early head with fan switch on coolant rail?



thought there was something different about it

[LeeVuong]

That third switch looks like what I want to do. That switch is probably for a water temp gauge inside the car.

[hardtailer]

Do you mean you want to trip a warning light with it?

[LeeVuong]

Originally posted by hardtailer
Do you mean you want to trip a warning light with it?

Not a warning light, simply another water temp gauge.

[hardtailer]

that will be hard with a switch, but I take it you'll use a temp sender/sensor for it.
Personally I see more of a benefit in a warning light than in an additional temp gauge, even if that shows a numeric value. It’s like oil pressure, I don’t need to know what it is exactly I just need to know when it is about to go wrong so I can react before damage is done.

[Italian M3]

I just thought it looked "Factory" as opposed to an aftermarket job. A very clean install if it is the latter.
I would have thought a warning light would also be a good idea as opposed to another water temp guage.

P.S. "Hardtailer" Have you still got your 320is or did you get rid of that?

[hardtailer]

I still got it. Both actually, a 4-door and a 2-door 'track rat' with a blown engine that has been sitting for the past year. Finally got hold of a sound S14B20 that I will put in there over winter.

[Mmark]

That looks to me like a pressure sensor on the rail.
If so, nice idea, but I don't think that photo is honest.


m

[Demlotcrew]

That rail looks DTM motorsport to me not an early one.

Andrew

[///meric]

ive never seen this before, but after seeing this im going to add two more sensors to my coolent rail for a temp gauge and a fan switch

[hardtailer]

Originally posted by ///meric
ive never seen this before, but after seeing this im going to add two more sensors to my coolent rail for a temp gauge and a fan switch

What use is that? You already have a temp gauge and you can fit a temp switch for an aux fan either in the thermostat housing or in the bottom of the radiator (in that case you’ll need a switch that switches at 10°C lower temps (81°C-88°C)…