Firewall switch?

[JoeMadoo]

Anyone know what the little switch/sensor does thats mounted on the firewall next to the battery terminal does? 86 325es.

[Mr Deagle]

i would also like to know, my 318i has it(nothing connected) my 325e has it(was connected) and my parts 325i never had one

[e30_325es]

Pic?

[JoeMadoo]

here is a sexy pic

[NC325iC]

never seen it

[Sean]

no switch on my car either.

[rs4pro3]

It's only on eta and 318i models that had the seperate idle control module. It's an air temperature switch that closes below 32 F I assume as it feeds directly to the idle module that it changes the idle speed when it's real cold outside. The Green/yellow wire going to it should be a switched 12 volt source

[JoeMadoo]

Ahh thanks man.